Publications
(232) New Journal of Chemistry (Q2, IF = 3.925)
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Microwave-Assisted Synthesis of Porous Biomolecule-Incorporated Metal-Organic Frameworks as Efficient Nanocarriers for Anti-Cancer DrugsTrang Thi Thu Nguyen, Bao Quang Gia Le, Vy Tran Hanh Nguyen, Jae‐Hyoung Lee, Ngoc Xuan Dat Mai, Linh Ho Thuy Nguyen, Tan Le Hoang Doan
Abstract:
Biomolecule-incorporated metal-organic frameworks (b-MOFs) exhibit enhanced bioavailability and biocompatibility, making them an ideal option for use as drug delivery vehicles. While b-MOFs possess outstanding drug loading and release capabilities, their microscale crystal sizes restrict their applicability as nanocarriers and drug delivery systems. To overcome this limitation, this paper presents a microwave-irradiation-based technique for the synthesis of porous adenine-incorporated Zn-based MOFs with particle sizes of approximately 200 nm as paclitaxel nanocarriers. The nanomaterial demonstrated a substantial paclitaxel loading capacity of 637 mg g−1. Moreover, it effectively increased the solubility of paclitaxel by 2.5-fold compared to that of the free form. Thus, the nano MOF is a promising delivery vehicle for paclitaxel. Notably, the paclitaxel-loaded nano MOF exhibited higher toxicity toward cancer cells than the free drug, further highlighting its potential as an effective anticancer agent.
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(230) Sensors and Actuators B: Chemical (Q1, IF = 8.4)
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Titanium-based Metal-organic-framework-coated SnO2 Nanowires With Enhanced NO2 Gas Sensing Capability in Humid EnvironmentKa Yoon Shin, Linh Ho Thuy Nguyen, Ha L. Nguyen, Ali Miraei, Vy Nguyen Hanh Tran, Ngoc Xuan Dat Mai, Ngoc Quang Tran, Wansik Oum, Eun Bi Kim, Hyeong Min Kim, Thang Bach Phan, Tan Le Hoang Doan, Sang Sub Kim, Hyoun Woo Kim
Abstract:
Herein, the NO2 gas sensing features of SnO2 nanowires (NWs) and titanium-based metal–organic framework 901 (MOF-901)-coated SnO2 NWs were investigated. Both gas sensors showed excellent selectivity to NO2. At 200°C, the responses of SnO2 NWs and MOF-901-coated SnO2 NWs to NO2 (10 ppm) were 9.7 and 8.2, respectively. However, in a humid atmosphere, the latter nanowires showed better performance, mainly because of their hydrophobic nature and the metal–organic framework layer. At relative humidities (RHs) of 20% and higher, the MOF-901-coated sensor showed higher performance than the pristine sensor. In particular, at 80% RH, responses of 6.6 and 4.0 were obtained for these two sensors to 10 ppm NO2, respectively. Furthermore, the MOF-901-coated SnO2 NWs showed better selectivity than the other sensor. We showed that MOF-901 behaved an important role in reducing the effects of water vapor and that it can be used as a molecular sieve for enhancing the NO2 gas response of SnO2 NWs in humid environments.
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(229) Catalysts (Q2, IF = 3.9)
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Efficient conversion of monosaccharides into 5-hydroxymethylfurfural using acidic deep eutectic solvents
Phuong Hoang Tran, Linh To Ngoc, Trinh Hao Nguyen, Thien Phuoc Nguyen, Tan Le Hoang Doan, Linh Ho Thuy Nguyen, Ha Bich Phan, Dang Van Chinh
Abstract:
In this study, a quick, simple, green method of converting carbohydrates into 5-hydroxymethylfurfural (HMF) with the use of deep eutectic solvents (DESs) was reported on. We synthesized 12 DESs for HMF conversion from carbohydrates which were studied under different conditions. Under optimal conditions, oxalic acid and citric acid with a choline chloride-based DES produced a maximum yield of HMF at 59 ± 2% and 62 ± 3% in 5 min at 120 °C, respectively. The efficiency of converting glucose to HMF in a short time (5 min) at 140 °C using CrCl3 with a choline chloride-based DES was around 37 ± 1%, which was higher than in previous work. This study demonstrates the significant potential of DESs as a combination for the continuous catalytic transformation of biomass in the synthesis of platform chemicals. |
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(228) The Journal of Physical Chemistry Letters (Q1, IF = 5.7)
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Highly Efficient and Stable Hydrogen Evolution from Natural Seawater by Boron-Doped Three-Dimensional Ni2P–MoO2 Heterostructure Microrod Arrays
Le Phuc Phan, Thuy Tien Nguyen Tran, Thuy-Kieu Truong, Jianmin Yu, Hanh-Vy Tran Nguyen, Thang Bach Phan, Nhu Hoa Thi Tran, Ngoc Quang Tran
Abstract: The rational design of highly active and stable electrocatalysts toward the hydrogen evolution reaction (HER) is highly desirable but challenging in seawater electrolysis. Herein we propose a strategy of boron-doped three-dimensional Ni2P–MoO2 heterostructure microrod arrays that exhibit excellent catalytic activity for hydrogen evolution in both alkaline freshwater and seawater electrolytes. The incorporation of boron into Ni2P–MoO2 heterostructure microrod arrays could modulate the electronic properties, thereby accelerating the HER. Consequently, the B–Ni2P–MoO2 heterostructure microrod array electrocatalyst exhibits a superior catalyst activity for HER with low overpotentials of 155, 155, and 157 mV at a current density of 500 mA cm–2 in 1 M KOH, 1 M KOH + NaCl, and 1 M KOH + seawater, respectively. It also exhibits exceptional performance for HER in natural seawater with a low overpotential of 248 mV at 10 mA cm–2 and a long-lasting lifetime of over 100 h. |
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(227) Polymers (Q1, IF = 4.967)
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Facile Hydrothermal Synthesis of Ag/Fe3O4/Cellulose Nanocomposite as Highly Active Catalyst for 4-Nitrophenol and Organic Dye ReductionAn Nang Vu, Hoa Ngoc Thi Le, Thang Bach Phan, Hieu Van Le
Abstract: Novel effluent treatment solutions for dangerous organic pollutants are crucial worldwide. In recent years, chemical reduction using noble metal-based nanocatalysts and NaBH4, a reducing agent, has become common practice for eliminating organic contaminants from aquatic environments. We suggest a straightforward approach to synthesizing magnetic cellulose nanocrystals (CNCs) modified with magnetite (Fe3O4) and silver nanoparticles (Ag NPs) as a catalyst for organic contamination removal. Significantly, the CNC surface was decorated with Ag NPs without using any reducing agents or stabilizers. PXRD, FE-SEM, TEM, EDX, VSM, BET, and zeta potential tests characterized the Ag/Fe3O4/CNC nanocomposite. The nanocomposite’s catalytic activity was tested by eliminating 4-nitrophenol (4-NP) and the organic dyes methylene blue (MB) and methyl orange (MO) in an aqueous solution at 25 °C. The Ag/Fe3O4/CNC nanocomposite reduced 4-NP and decolored these hazardous organic dyes in a short time (2 to 5 min) using a tiny amount of catalyst (2.5 mg for 4-NP and 15 mg for MO and MB). The magnetic catalyst was removed and reused three times without losing catalytic activity. This work shows that the Ag/Fe3O4/CNC nanocomposite can chemically reduce harmful pollutants in effluent for environmental applications.
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(226) Physica B: Condensed Matter (Q2, IF = 2.8)
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Fine-tuning high electrical conductivity of Mg-Doped CuCrO2 delafossite thin films through preferred-(110) orientation and film thickness control
Dung Van Hoang; Hanh Duc Thi Dinh; Truong Huu Nguyen; Anh Tuan Thanh Pham; Uyen Tu Thi Doan; Trang Thuy Thi Phan; Ke Huu Nguyen; Thang Bach Phan, Tran Cao Vinh
Abstract: High-performance CuCr0·95Mg0·05O2 delafossite thin films were grown on soda-lime glass substrates using dc magnetron sputtering. The electrical and structural properties of the films were found to be tightly correlated, with the preferred-(110) orientation playing a crucial role in high electrical conductivity. The optimal thickness for the best (110) orientation was 550 nm, and the (110) peak only appeared in films thicker than 400 nm. The results demonstrate that dc magnetron sputtering can produce high-quality CuCr0·95Mg0·05O2 thin films with preferred-(110) crystal orientation, which is important for high electrical conductivity. The 550-nm thick sample showed the best electrical properties with a low resistivity of 4.08 × 10−2 Ω cm. Optimized growth conditions of CuCr0·95Mg0·05O2 thin films, including preferred-(110) orientation and optimal thickness, may lead to high-performance p-type oxide materials that complement suitable n-type materials for optoelectronic applications. |
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(225) New Journal of Chemistry (Q2, IF = 3.925)
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Silver decorated on cobalt ferrite nanoparticles as a reusable multifunctional catalyst for water treatment applications in non-radiation conditions Le Thi Ngoc Hoa, Vu Nang An, Vo Huynh Tra My, Pham Thi Thu Giang, Le Khac Top, Ha Thuc Chi Nhan, Phan Bach Thang, Tran Thi Thanh Van and Le Van Hieu
Abstract: In this investigation, cobalt ferrite nanoparticles (CFO NPs) were synthesized using a hydrothermal method. Then, silver nanoparticles (Ag NPs) were decorated on CFO NPs to form Ag/CFO NPs using jasmine extract as a reducing agent of Ag+ ions. The properties of Ag/CFO NPs were characterized by X-ray powder diffraction, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, vibrating sample magnetometry, and catalytic tests in non-radiation conditions. The catalytic results indicated that the Ag/CFO NPs could activate peroxymonosulfate to generate sulfate radicals for the decomposition of different dyes such as methylene blue, methyl orange, and rhodamine B. For the Ag/CFO sample, Ag NPs validated the roles in dye adsorption, reduction of 4-nitrophenol, and improvement of antibacterial behavior. The growth inhibition activity of Ag/CFO NPs was observed against Pseudomonas aeruginosa (18.18 ± 2.48 mm) and Staphylococcus aureus (10.14 ± 0.72 mm). Furthermore, Ag/CFO NPs displayed good reusability after three consecutive runs. Therefore, Ag/CFO material is shown to be a potential multifunctional catalyst in wastewater treatment.
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(224) Optical Materials (Q1, IF = 3.9)
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Application of hybrid Aucore–Agshell nanostructures in fiber optic biosensor for rapid detection of C-reactive protein (CPR) Nguyen Tran Truc Phuong, Do Thao Anh, Nguyen Hoang Nhat Thao, Hanh Kieu Thi Ta, Nhat Quang Minh Tran, Ta Ngoc Bach, Bach Thang Phan, Nhu Hoa Thi Tran
Abstract: Elevated levels of C-reactive protein (CRP) in the bloodstream are a well-established marker of systemic inflammation in humans. Research on the application of hybrid plasmon material for optical fiber sensor application to sensitively monitor C-reactive protein concentration based on the hybrid material particles has been proposed in this study. Specifically, Au@Ag nanoparticles are coated onto the optical fiber surface by a self-assembled monolayer using an NH2 bridge. CRP antigens are then immobilized onto the surface of Au@Ag NPs to selectively detect CRP and improve sensor sensitivity. The limit of detection for this fiber sensor is 2.4 × 10−5 mg/L. The selectivity of the sensor was also demonstrated in media containing bovine serum albumin (BSA) and glucose. These findings represent an important step toward the development of biosensors capable of monitoring extremely low concentrations of biomolecules in vivo, thereby supporting early disease detection and diagnosis.
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(222) New Journal of Chemistry (Q2, IF = 3.925)
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A greener approach for the synthesis of 3-cyanoacetamide pyrrole catalyzed by amorphous carbon-supported sulfonic acid
Hai Truong Nguyen, Tan Van Le, Phat Ngoc Nguyen, Khanh Ha Nguyen, Linh Ho Thuy Nguyen, Tan Le Hoang Doan, Phuong Hoang Tran
Abstract:
Amorphous carbon-supported sulfonic acid (AC–SO3H) is known as a new-generation solid catalyst with exceptional activity in organic synthesis. We report here the synthesis of sulfonated amorphous carbon, that possesses sulfonic acid groups, via the partial carbonization and then sulfonation of rice husk. The presence of –SO3H groups on the surface of the amorphous carbon significantly increased the catalytic activity in organic synthesis. In this study, the catalytic activity of AC–SO3H in the synthesis of 3-cyanoacetamide pyrrole from 1,3-diketones, primary amines, phenylglyoxal monohydrate, and malononitrile in acetone was assessed. We investigated the influence of the amine derivatives on the reaction outcome and the formation of by-products during the reaction. The main product was obtained in yields of up to 67%. The activity of the catalyst was also evaluated through a leaching test, whilst the recovery and reuse efficiency of the catalyst was also studied, with a negligible reduction in activity observed.
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(221) Inorganic Chemistry (Q1, IF = 5.436)
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Promoting High-Oxidation-State Metal Active Sites in Hollow Ternary Metal Fluoride Nanoflakes Array for Urea Electrolysis
Ngoc Tuan Nguyen, Thuy Tien Nguyen Tran, Thuy-Kieu Truong, Jianmin Yu, Thong Nguyen-Minh Le, Thang Bach Phan, Tan Le Hoang Doan Linh Ho Thuy Nguyen, Tin Dai Luong Thi-Hiep Nguyen Ngoc Quang Tran
Abstract:
The adsorption ability of hydrogen, hydroxide, and oxygenic intermediates plays a crucial role in electrochemical water splitting. Electron-deficient metal-active sites can prompt electrocatalytic activity by improving the adsorption ability of intermediates. However, it remains a significant challenge to synthesize highly abundant and stable electron-deficient metal-active site electrocatalysts. Herein, we present a general approach to synthesizing a hollow ternary metal fluoride (FeCoNiF2) nanoflake array as an efficient and robust bifunctional electrocatalyst for the hydrogen evolution reaction (HER) and urea oxidation reaction (UOR). We find that the F anion withdraws electrons from the metal centers, inducing an electron-deficient metal center catalyst. The rationally designed hollow nanoflake array exhibits the overpotential of 30 mV for HER and 130 mV for UOR at a current density of 10 mA cm–2 and superior stability without decay events over 150 h at a large current density of up to 100 mA cm–2. Remarkably, the assembled urea electrolyzer using a bifunctional hollow FeCoNiF2 nanoflake array catalyst requires cell voltages of only 1.352 and 1.703 V to afford current densities of 10 and 100 mA cm–2, respectively, which are 116 mV less compared with that required for overall water splitting.
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(220) Journal of Science: Advanced Materials and Devices (Q1, IF = 7.382)
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Influence of ZIF-9 and ZIF-12 structure on the formation of a series of new Co/N-doped porous carbon composites as anode electrodes for high-performance lithium-ion batteries Duong, Anh ; Nguyen, Hoang; Man, Tran Van; Ngo, Quynh; Luu, Loc; Doan, Tan; Nguyen, Hung; Nguyen, My
Abstract:
A series of new Co/N-doped porous carbon composites, denoted as Co/CZIF-9 and Co/CZIF-12, containing Co nanoparticles encapsulated in nitrogen-doped carbon matrices were prepared by annealing Co-based zeolite imidazolate framework materials, ZIF-9 and ZIF-12, as the efficient precursors at different temperatures. The structural features of the as-synthesized composites at 900 °C were determined by analytical methods with high reliability. Consequently, Co/CZIF-12_900 exhibits a high first specific discharge capacity of 971.0 mA h g−1 at a current density of 0.1 A g−1. Notably, the specific discharge/charge capacity of Co/CZIF-12_900 reaches about 508.8 mA h g−1 at 0.1 A g−1 after 100 cycles. The outstanding behaviors can be accounted for by the efficient incorporation of hetero-nitrogen doping and the Co nanoparticles within the layered structure of porous carbon, enhancing electrical conductivity and structural stability and limiting volume change during the intercalation/deintercalation of Li+ ions. These findings suggest that the Co/CZIF-12_900 material could be employed as a promising anode electrode for energy storage products. |
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(219) Journal of Science: Advanced Materials and Devices (Q1, IF = 7.382)
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Novel composites of nano-metal–organic frameworks (IRMOF-3) and silver nanoparticles for the ultra-sensitive performance of SERS sensing and optical fiber modes Tran, Nguyen La Ngoc; Hoang, Dung Van; Pham, Anh; Tran Truc Phuong, Nguyen; Mai, Ngoc Xuan Dat;Tran Thi Kim Chi, Bui Thi Thu Hien; Phan, Thang; Tran, Nhu Hoa Thi Abstract:
Rapid chemical detection of drugs of abuse in biological fluids such as blood and saliva is a concern within medicine and law enforcement. As an outcome, a label-free detection platform takes biological fluid samples with concentrations ranging from extremely high to very low. We obtained experimentally the limit of detection (LOD) of glycerol concentration, corresponding to a minimum resolvable refractive index of 3.4 10−7 RIU (refractive index unit). We applied the microfluidic device sensors to the quantitating concentration dopamine solutions. The experiment was recorded in real-time as the concentration of analyte injected exposed to the fiber core surface resulted in a sensitive change in optical power transmission. The presented sensors also exhibited reasonably good reproducibility and higher sensitivity, providing the LOD as 1.02 10−11 M. A relatively simple scheme procedure is proposed for the simultaneous detection and quantitative assessment of rhodamine B using surface-enhanced Raman spectroscopy with a limit of detection of 10−12 M and a relative standard deviation of 5.78% across a detection concentration range mainly from 10−5 M to 10−12 M. The obtained results demonstrate the potential of nano-metal–organic framework materials as large-area, label-free optical fiber sensors and SERS-based platforms for biomedical sensing and environmental applications.
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(218) Journal of Physics and Chemistry of Solids (Q2, IF = 4.383)
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Intense green upconversion in core-shell structured NaYF4:Er,Yb@SiO2 microparticles for anti-counterfeiting printing
Nguyen Ba Tong, Le Van Si, Cao T.M. Dung, Ta Thi Kieu Hanh, Tran Thi Ngoc Lam, Phan Bach Thang, Do Huy Binh, Nguyen Thai Ngoc Uyen, Maurizio Ferrari, Tran Thi Thanh Van
Abstract:
Rare-earth-doped NaYF4nanoparticles are considered crucial upconversion luminescent materials with many applications, including anti-counterfeiting printing, biological imaging, and optical information storage. This work presents progress in obtaining hydrophilic pigments based on NaYF4:Er,Yb@SiO2 nanoparticles, and their utilization in water-based ink printing for anti-counterfeiting applications. Coating NaYF4:Yb/Er microparticles with SiO2 shells can provide several benefits for printing purposes, such as improved stability, dispersion, and ease of printing. The hydrophilic core-shell structured β-NaYF4:Er, Yb@SiO2 microparticles were successfully prepared using the hydrothermal synthesis and sol-gel Stober method. The obtained microparticles were characterized by Scanning Electron Microscopy, X-ray diffraction, and Energy-dispersive X-ray spectroscopy. Such characterizations confirm that the Er3+ and Yb3+ ions are incorporated in NaYF4 cores, the NaYF4:Er, Yb cores are in hundreds of nanometer sizes, and the NaYF4:Er, Yb microparticles are coated by a silica layer of 50 nm thick. Both NaYF4:Er, Yb and NaYF4:Er, Yb@SiO>2 behave as up-conversion luminescent microparticles for both green and red emissions. The CIE chromaticity coordinates indicate that both the nanoparticles have their greenish color under excitation at 980 nm. Although decorating the NaYF4:Er, Yb nanoparticles with the SiO2 shell decreases luminescent intensity (by a factor of 2), this step is still necessary to achieve hydrophilic surfaces for preparing water-based printing inks. Using the synthesized NaYF4:Er, Yb@SiO>2 as a pigment, a new water-based ink formula was created based on Polyamide as a polymer matrix. The obtained ink is printable on paper and on transparent and flexible Polyethylene substrate. The printed patterns with a height of 2 cm and a width of 2.5 cm were observed clearly under the irradiation of a 980 nm LED. Their durability in terms of sharpness and color was also assessed after six months.
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(217) Materials Chemistry and Physics(Q2, IF = 4.778)
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Sonochemical-synthesized biphasic tricalcium phosphate: Influence of synthesis parameters on the physicochemical properties and in vitro remineralization in artificial saliva
Nhi Thao-Ngoc Dang, Nam Minh-Phuong Tran, Hoan Ngoc Doan, Nam Cong-Nhat Huynh, An Tran-My Le, Hai-Ly Tran, Hanh Kieu Thi Ta, Thang Phan, Toi Van Vo, Hiep Thi Nguyen
Abstract:
Biphasic calcium phosphate (BCP) is an ideal bone substitute with controllable bioresorption/biodegradation by changing its relative amount of hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) compositions. This study investigated the effect of synthetic conditions on the physicochemical properties and the remineralization behaviors of BCP materials in artificial saliva (AS). BCPs were obtained under the sonochemical condition at pH of 5.0 (BCP_5), 7.0 (BCP_7), and 9.0 (BCP_9), and all were sintered at 800, 1000, and 1200 °C. The HA/β-TCP ratio of BCPs increased according to the pH increase during the synthesis process. BCP_5 sintered at 800 °C with the highest β-TCP contents demonstrated (1) fast neutralization capacity to prevent enamel from dissolving in acidic saliva and (2) remineralization ion supply, and (3) new apatite formation found in acidic AS, indicating its high potential remineralization agent for dental care applications.
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(216) Journal of Physics and Chemistry of Solids (Q2, IF = 4.383)
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Effect of annealing temperature on phase transitions and photo-Fenton catalytic activity of CoFe2O4 nanopowder
Hoa Le Thi Ngoc, An Vu Nang, Khoa Le Tien, Kateryna Kornieieva, Tuyen Luu Anh, Tiep Nguyen Van, Thang Phan Bach, Sungkyun Park, Van Tran Thi Thanh, Chi Nhan Ha Thuc, Hieu Le Van
Abstract:
In this work, the hydrothermal technique was used to synthesize cobalt ferrite (CFO) magnetic nanoparticles. Then, the as-prepared CFO sample was annealed at four different temperatures (600, 700, 800, and 900 °C) to study the effect of the annealing temperature on the crystallite growth, magnetic properties, phase transitions, and photo-Fenton catalytic activity of CFO powder samples. The properties of CoFe2O4 were characterized by X-ray powder diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, Brunauer–Emmet–Teller analysis, vibrating sample magnetometry, and catalytic tests. The results showed that the annealing temperature significantly affected the phase structure, crystallite size, morphology, specific surface area, magnetic properties, and catalytic activity of CFO powder samples. The calcined CFO sample had higher catalytic activity than the as-prepared CFO. At the annealing temperature of 600 °C (CFO-600), the catalytic efficiency and rate constant of this material for the degradation of methylene blue under ultraviolet A irradiation for 60 min reached 95% and 3.16 h−1, respectively, in the presence of oxalic acid as a potential oxidizing agent. We also found that a higher number of Fe3+ ions occupying octahedral sites on the CFO surface resulted in a higher activity of the CFO photo-Fenton catalyst. In particular, the CFO-600 powder with excellent magnetic properties exhibited a good recycling catalytic performance. The present material holds promise as a potential practical candidate for treating pollution caused by organic dyes and limiting secondary contaminants released during the photocatalyst process.
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(215) Journal of Science: Advanced Materials and Devices(Q1, IF = 7.382)
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Synergy of indium doping and hydrogenation for good-performance and high-mobility ZnO electrode films Pham Thanh Tuan Anh, Trang Thuy Thi Phan, Truong Huu Nguyen, Dung Van Hoang, Oanh Kieu Truong Le, Uyen Tu Thi Doan, Thang Bach Phan, Vinh Cao Tran Abstract:
We successfully synthesized hydrogenated In-doped ZnO films with a low resistivity of 5 × 10−4 Ωcm and a good transmittance of 80% in the visible region. Furthermore, the electron mobility of the films achieves as high as 45.6 cm2/Vs, which is enhanced by more than 100% compared to the singly In-doped ZnO (IZO) and pristine ZnO films. The analysis of temperature-dependent mobility indicates lattice scattering as the dominant mechanism disturbing carrier transport in the hydrogenated film. According to the Drude model theory, the optical carrier concentration and mobility determined from plasma wavelength also exhibit a significant role of lattice defects. As a result, the reduction in lattice defects is demonstrated to remarkably enhance the mobility and transparent-conducting performance of the hydrogenated IZO films. Specifically, hydrogen passivation and compensation of indium doping significantly decrease Zn-related defects (vacancy and interstitial) as carrier traps and scattering centers in the films.
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(213) RSC Advances (Q2, IF = 4.036)
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Insight into the direct conversion of methane to methanol on modified ZIF-204 from the perspective of DFT-based calculations Thong Nguyen-Minh Le, Thu Nguyen-Bao Le, Phat Nguyen Tan; Trang Nguyen Thuy; Quang Ngoc Tran; Toan Nguyen The; Kawazoe Yoshiyuki; Thang Bach Phan; Duc Nguyen Manh Abstract:
Direct oxidation of methane over oxo-doped ZIF-204, a bio-mimetic metal–organic framework, is investigated under first-principles calculations based on density functional theory. In the pristine ZIF-204, the tetrahedral methane molecule anchors to an open monocopper site via the so-called η2 configuration with a physisorption energy of 0.24 eV. This weak binding arises from an electrostatic interaction between the negative charge of carbon in the methane molecule and the positive Cu2+ cation in the framework. In the modified ZIF-204, the doped oxo species is stabilized at the axial position of a CuN4-base square pyramid at a distance of 2.06 Å. The dative covalent bond between Cu and oxo is responsible for the formation energy of 1.06 eV. With the presence of the oxo group, the presenting of electrons in the O_pz orbital accounts for the adsorption of methane via hydrogen bonding with an adsorption energy of 0.30 eV. The methane oxidation can occur via either a concerted direct oxo insertion mechanism or a hydrogen-atom abstraction radical rebound mechanism. Calculations on transition-state barriers show that reactions via the concerted direct oxo insertion mechanism can happen without energy barriers. Concerning the hydrogen-atom abstraction radical rebound mechanism, the C–H bond dissociation of the CH4 molecule is barrierless, but the C–O bond recombination to form the CH3OH molecule occurs through a low barrier of 0.16 eV. These predictions suggest the modified ZIF-204 is a promising catalyst for methane oxidization. |
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(212) Chemical Engineering Journal(Q1, IF = 16.744 )
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Transparent-flexible thermoelectric module from In/Ga co-doped ZnO thin films
Athorn Vora-ud, Anh Tuan Thanh Pham, Dai Cao Truong, Somporn Thoawankeaw, Hoa Thi Lai, Thu Bao Nguyen Le, Nhat Minh Quang Tran, Mekhala Insawang, Pennapa Muthitamongkol, Mati Horprathum, Manish Kumar, Sungkyun Park, Gerald Jeffrey Snyder, Tosawat Seetawan, Thang Bach Phan
Abstract:
Transparent-flexible thermoelectric thin films have immense potential as power supplies for future small-sized consumer electronics, the internet of things, and wearable devices. Here, we report the thermoelectric properties of dual Ga and In doped ZnO films (IGZO) deposited on a polyimide substrate with post-thermal treatment in vacuum along with fabricating 4-unileg flexible IGZO thermoelectric devices. All the as-deposited and annealed IGZO films are the preferred (002) orientation and under tensile stress. The post-thermal treatment controls the dopant substitution/diffusion in the host ZnO lattice affecting the film crystallinity, residual stress, and thermoelectric properties. Among the films, the IGZO film annealed at 250 °C has the best power factor of 16.9 μWm−1K−2 with the largest crystal size, lowest tensile stress, highest carrier concentration, and lowest density-of-state effective mass. The practical application of flexible IGZO films was also reported via a 4-unileg-IGZO films thermoelectric module, which achieved an output power about 3.2 nW at ΔT = 120 K.
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(211) Sensors and Actuators B: Chemical (Q1, IF = 9224)
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Fe-based metal-organic framework as a chemiresistive sensor for low-temperature monitoring of acetone gas Linh Ho Thuy Nguyen, Sachin T Navale, Dong Hoon Yang, Hue Thi Thu Nguyen, Thang Bach Phan, Jin-Young Kim, Ali Mirzaei, Tan Le Hoang Doan, Sang Sub Kim, Hyoun Woo Kim
Abstract:
This work demonstrates the potential of a novel iron-based metal-organic framework (Fe-MOF or VNU-15) to effectively detect low-concentration volatile organic compounds (VOCs), particularly acetone (CH3COCH3). A facile solvothermal strategy was used to synthesize Fe-MOFs, comprising Fe(II)/Fe(III) and two distinct linkers—BDC (benzene-1,4-dicarboxylate) and NDC (naphthalene-2,6-dicarboxylic acid). As a first step, Fe-MOFs were characterized to determine their pure phase formation and identify their structural and morphological characteristics. Fe-MOFs processed via the solvothermal method demonstrated high crystallinity, high thermal stability, polyhedral crystal-shaped surface morphology, and a surface area of 735 m2g−1, making them suitable for gas-sensing applications. Laboratory-scale gas-sensing devices were fabricated by printing Fe-MOF powder onto patterned interdigitated electrodes, with performance measurements conducted on these devices in response to exposure to various target gases at temperatures between 25 and 200 °C and gas concentrations between 1 and 10 ppm. Gas-sensing tests confirmed that the VNU-15 sensor selectivity detects CH3COCH3 with a gas response of 1.68–10 ppm and a response time of 64 s, followed by a recovery time of 166 s at 50 °C. This study demonstrates the feasibility of using novel MOF-based sensing channels as low-temperature gas sensors, providing new insights into gas-sensing technology.
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(210) Journal of Solid State Chemistry(Q2, IF = 3.656)
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The impact of sintering temperature on the thermoelectric performance of Cu2Se synthesized by solid state reaction method Trung Kien Mac, Thi Thu Ta, Huu Tuan Nguyen, Nhu Van Hoang, Thi Lan Huong Pham, Van thiet Duong, Thanh Tuan Anh Pham, Bach Thang Phan, Sunglae Cho, Duong Anh Tuan
Abstract: In this study, copper selenide (Cu2Se) compounds were synthesized using a solid-state reaction technique and post-sintering processes (573 K–973 K). The mass density of the Cu2Se compounds decreased with increasing sintering temperatures due to changes in grain morphology and an increase in the number and size of pores in the samples. The sintering temperature also affected carrier generation mechanisms, which directly impacted the electrical transport characteristics and thermal properties. The α→β phase transition at around 400 K was observed in all samples. The low thermal conductivity was mainly attributed to the low lattice thermal conductivity (κlattice). As the result, the sample sintered at 773 K showed an outstanding ZT value of 1.44 at 773 K, with a power factor of 12.1 μWm−1K−2 and the thermal conductivity of 0.65 Wm−1K−1. The sintering temperature dependence of thermal conductivity was elucidated in terms of the growth of microstructural pores. |
(209) Ceramics International (Q1, IF = 5.532)
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Calcination-dependent microstructural and optical characteristics of eco-friendly synthesized ZnO nanoparticles and their implementation in analog memristor application
Quan Phu Pham, Quy Ngoc Le Nguyen, Ngoc Hong Nguyen , Uyen Tu Thi Doan, Thuy Dieu Thi Ung, Vinh Cao Tran, Thang Bach Phan, Anh Tuan Thanh Pham, Ngoc Kim Pham
Abstract:
Using Camellia Sinensis leaf aqueous extract as a friendly reducing, capping, and stabilizing agent, ZnO nanoparticles (NPs) are synthesized via the green process. The plausible mechanism for the ZnO NPs formation is proposed as the chelation of Zn, or metal complexation, under the thermally assisted energy from the annealing process. An inclusive study on the effect of the annealing process on the ZnO NPs is conducted from room temperature to 850°C. The structural, morphological, thermal, and optical characteristics and their intercorrelation with annealing temperature are thoroughly studied. In particular, the change of crystalline texture coefficient contributed to the systematic perspective of the shape changes of the ZnO NPs. The (002)-oriented growth becomes preferred at 400–700 °C, corresponding to the increase of conical-shaped NPs from 150 to 250 nm in average size. With further temperature, the preferred growth transfers from (002) to (100) orientations, and polygonal spherical-shaped NPs can be obtained. Photoluminescence spectra reveal that singly and doubly ionized oxygen vacancies are the most dominant in the NPs. With the optimized green materials, implementing an eco-friendly memristor based on ZnO NPs found promising for electronic devices.
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(208) RSC Advances (Q1, IF = 4.013 )
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Conversion of cellulose into valuable chemicals using sulfonated amorphous carbon in 1-ethyl-3-methylimidazolium chloride
Nguyen, Thien-Hang; Phan, Ha; Nguyen, Trinh; Tran, Kim; Nguyen, Linh; Doan, Tan; Tran, Phuong
Abstract:
In this study, three carbon-based solid acid catalysts were prepared via the one-step hydrothermal procedure using glucose and Brønsted acid, including sulfuric acid, p-toluenesulfonic acid, or hydrochloric acid. The as-synthesized catalysts were tested for their ability to convert cellulose into valuable chemicals. The effects of Brønsted acidic catalyst, catalyst loading, solvent, temperature, time, and reactor on the reaction were investigated. The as-synthesized C–H2SO4 catalyst containing Brønsted acid sites (–SO3H, –OH, and –COOH functional groups) demonstrated high activity in the transformation of cellulose into valuable chemicals with the yield of total products of 88.17% including 49.79% LA in 1-ethyl-3-methylimidazolium chloride ([EMIM]Cl) solvent at 120 °C in 24 h. The recyclability and stability of C–H2SO4 were also observed. A proposed mechanism of cellulose conversion into valuable chemicals in the presence of C–H2SO4 was presented. The current method could provide a feasible approach for the conversion of cellulose into valuable chemicals.
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(207) MRS Communications (Q 2, IF = 2.935)
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The bipolar and self-rectifying resistive switching characteristics of UiO-66 modified with Uric Acid
Hau Huu Do Ho, Uyen Tu Doan Thi, Nhu Hoa Tran Thi, Trieu Quang Vo, Linh Ho Thuy Nguyen, Tan Doan Le Hoang, Ngoc Kim Pham.
Abstract:
A memory device with multi-mode Current–Voltage characteristics is vital for various functions in integrated circuit applications. However, studying manufacturing and controlling multifunctional devices has always been challenging for researchers. In this study, uric acid (UA) guest molecules within the UiO-66 matrix act as modulators of charge transfer processes within thin films. The Ag/UiO-66-UA–PVA/Ag device, exhibited the bipolar and self-rectifying resistive switching behavior under the voltage magnitude, which has potential applications in nonvolatile data storage and limiting leakage current in high-density crossbar structures.
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(206) Fibers and Polymers (Q 2, IF = 2.347 )
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One-Pot Preparation of Antibacterial Electrospun Polycaprolactone Membrane Embedded with Gamma Irradiation-Induced Silver Nanoparticles
Chien Minh Tran, Ngoc Thi-Thanh Nguyen, Minh Hieu Ho, Vinh Khanh Doan, Khanh Loan Ly, Nhi Ngoc-Thao Dang, Nam Minh-Phuong Tran, Hoai Thi-Thu Nguyen, Long Phuoc Truong, Thai Minh Do, Quyen Ngoc Tran, Hien Quoc Nguyen, Dung Thi-My Dang, Thang Bach Phan, Toi Van Vo, Hiep Thi Nguyen
Abstract:
In this study, we proposed a straightforward electrospun polycaprolactone (PCL) loaded with silver nanoparticles (SNPs) membrane fabrication process, in which SNPs were directly synthesized from silver nitrate (AgNO3) in PCL–acetone mixture by gamma irradiation. The insolubility of AgNO3 in PCL solution was solved using an auxiliary dimethyl sulfoxide solvent. As a physical approach, gamma rays readily converted silver ions into SNPs without the addition of harmful reduction agents, which reduced the cytotoxicity of the synthesized material. By avoiding some processes such as purification, solvent removal, or redispersion of SNPs, this method was more time-saving compared to other related studies. SNPs formation was confirmed by both UV–Visible spectrum (UV–Vis) and X-ray diffraction analysis. Scanning electron microscopy (SEM) revealed that the addition of SNPs significantly reduced the fiber diameter of PCL–Ag membranes compared to that of raw PCL. Uniform spherical-shaped SNPs incorporated in PCL fibers were observed under transmission electron microscopy (TEM). The tensile test showed that the electrospun PCL–Ag membranes exhibited good mechanical characteristics. Moisture easily penetrated the porous microstructure of PCL–Ag, facilitating wound humidity regulation. Inductively coupled plasma-mass spectroscopy (ICP-MS) was employed to study the release profiles of SNPs at different time intervals. Overall, the PCL–Ag 500 ppm sample exerted excellent antibacterial activity against Pseudomonas aeruginosa and Staphylococcus aureus strains and low in vitro cytotoxicity..
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(205) Vacuum(Q 1, IF = 4.11 )
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Effect of substrate rotation and rapid thermal annealing on thermoelectric properties of Ag-doped Sb2Te3 thin films
Somporn Thaowonkaew, Mekhala Insawang, Athorn Vora-ud, Mati Horprathum, Pennapa Muthitamongkol, Santi Maensiri, Manish Kumar, Thang Bach Phan and Tosawat Seetawan Abstract:
In this work, homogeneous Ag-doped Sb2Te3 (AST) thin films were prepared using the rf magnetron sputtering technique. Thermoelectric properties of AST films have been investigated in terms of various substrate rotation speeds (20, 40, 60, and 80 rpm) and rapid post-thermal treatments at 250 oCin a vacuum. It was found that the thickness of AST films decreases with the increase in substrate rotation speeds. An Ag atomic composition slightly increases and the other Sb and Te atomic compositions slightly decrease with the increase of substrate speed rotations. The post-thermal treatment improved film crystallinity. Carrier scatterings at the grain boundaries tend to increase the resistivity and the Seebeck coefficient. The maximum power factor of 4.60 mW m−1K−2 (ρ = 19 μΩm, S = 298 μVK−1) is obtained in the AST thin films prepared with the substrate rotation speed of 60 rpm. The practical application of AST films was also reported via a thermoelectric module of five p-AST/n-Bi2Te3thin-film pairs with its achieved output power of 1.6 nW at ΔT = 20 K.
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(204) ChemNanoMat (Q 1, IF = 3.82 )
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Multilayer Graphene Oxide‐Silver Nanoparticles for Stable, Highly Sensitive, and Reusable SERS Platforms
Nguyen Thuy An, Hanh Kieu Thi Ta, Dung Van Hoang, Viet-Duc Phung, Nhu Hoa Thi Tran, Bach Thang Phan
Abstract:
Integrating noble metal nanoparticles and graphene materials to enhance the Raman signal is of great significance in surface-enhanced Raman scattering which enhancement silver nanoparticles (Ag) which are reported one of the strongest plasmonic properties materials that are easily synthesized. Graphene and its derivatives such as reduced graphene oxide (rGO) are capable of increasing the charge transfer between the adsorbent and the substrates leading to a chemical mechanism. The combination of the rGO/Ag nanohybrids shows great potential as substrates which is the association of the electromagnetic and chemical mechanism for more enhancement of the Raman signal. We report a rapid, easy, and low-cost method to fabricate rGO/Ag substrate for SERS using methylene blue as a probe molecule. The density of Ag This material exhibits superior sensitivity for detecting methylene blue down to a concentration of 10−9 M and enhancement factor SERS calculated reaches 108 demonstrations of the excellent Raman signal enhancement of rGO/Ag substrate. The relative standard deviation value calculated is 4.91% showing extremely good homogeneity and reproducibility, indicating the potential application in quantitative determination. The obtained results contribute to the development and optimization of substrates for application in the detection of trace amounts of organic substances in food and environmental applications.
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(203) Journal of Science: Advanced Materials and Devices (Q 1, IF = 7.382)
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Conversion of bipolar resistive switching and threshold switching by controlling conductivity behavior and porous volumes of UiO-66 thin films
Hau Huu Do Ho, Quan Phu Pham, Thanh Ngoc Ha, Tan Le Hoang Doan, Hanh Kieu Thi Ta, Thuy Dieu Thi Ung, Anh Tuan Pham Thanh, Linh Ho Thuy Nguyen, Ngoc Kim Pham
Abstract:
In the age of big data, a memory with cross-bar array architecture is urgently required to facilitate high-density data storage. To eliminate the sneak path current of integrated circuits, threshold switching-based selectors have been utilized simultaneously with resistive switching memories. In this study, the successful absorption of uric acid (UA) into a UiO-66 matrix was realized at room temperature without any disruption of the host crystalline structure. Fourier transform infrared and Raman spectra revealed the presence of UA based on the interaction of its carbonyl group with the UiO-66 matrix, whereas the diffraction peaks in the X-ray diffraction spectra of the (111) and (200) index planes were slightly shifted to the lower 2θ values, demonstrating the interaction of the UA on the system is occupy porous cages and free volume structures. The occupation of UA in the porous volume of the framework has been estimated by the significant vanishing of surface area from 1299 to 950 cm3 g−1 as well as the almost dismission of UiO-66 porous cages of 12.5 Å by BET analysis. The electronic transitions from linkers to metals and intramolecular between nearest linkers of UA absorbed UiO-66 were heavily reduced via the evidence from photoluminescence spectroscopy. These changes in structural and electronic density lead to the change in the electrical conduction mechanism, operating voltage, and resistive switching characteristics from memory switching to threshold switching corresponding to Ag/UiO-66–PVA/Ag and Ag/UA@UiO-66–PVA/Ag device, respectively. The reduction and vanish of porous cages and free volume restrict the formation management of silver conducting filaments through the UA@UiO-66–PVA matrix. This study provides a new approach to controlling the conversion switching behavior between memory and threshold in metal–organic framework materials for high-density cross-bar architecture. |
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(202) Wiley Interdisciplinary Reviews: Nanomedicine And Nanobiotechnology , (Q 1, IF = 9.423 )
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Trend in biodegradable porous nanomaterials for anticancer drug delivery.Bao Quang Gia Le, Tan Le Hoang Doan
Abstract:
In recent years, biodegradable nanomaterials have exhibited remarkable promise for drug administration to tumors due to their high drug-loading capacity, biocompatibility, biodegradability, and clearance. This review will discuss and summarize the trends in utilizing biodegradable nanomaterials for anticancer drug delivery, including biodegradable periodic mesoporous organosilicas (BPMOs) and metal-organic frameworks (MOFs). The distinct structure and features of BPMOs and MOFs will be initially evaluated, as well as their use as delivery vehicles for anticancer drug delivery applications. Then, the themes for the development of each material will be utilized to illustrate their drug delivery performance. Finally, the current obstacles and potential for future development as efficient drug delivery systems will be thoroughly reviewed. This article is categorized under: Therapeutic Approaches and Drug Discovery > Nanomedicine for Oncologic Disease.
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