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Preparing cuprous oxide nanomaterials by electrochemical method for non-enzymatic glucose biosensor
Nguyen, Thu-Thuy,Huy, Bui The,Hwang, Seo-Young,Vuong, Nguyen Minh,Pham, Quoc-Thai,Nghia, Nguyen Ngoc,Kirtland, Aaron,Lee, Yong-Ill IOP 2018 Nanotechnology Vol.29 No.20
<P>Cuprous oxide (Cu<SUB>2</SUB>O) nanostructure has been synthesized using an electrochemical method with a two-electrode system. Cu foils were used as electrodes and NH<SUB>2</SUB>(OH) was utilized as the reducing agent. The effects of pH and applied voltages on the morphology of the product were investigated. The morphology and optical properties of Cu<SUB>2</SUB>O particles were characterized using scanning electron microscopy, x-ray diffraction, and diffuse reflectance spectra. The synthesized Cu<SUB>2</SUB>O nanostructures that formed in the vicinity of the anode at 2 V and pH?=?11 showed high uniform distribution, small size, and good electrochemical sensing. These Cu<SUB>2</SUB>O nanoparticles were coated on an Indium tin oxide substrate and applied to detect non-enzyme glucose as excellent biosensors. The non-enzyme glucose biosensors exhibited good performance with high response, good selectivity, wide linear detection range, and a low detection limit at 0.4 <I>μ</I>M. Synthesized Cu<SUB>2</SUB>O nanostructures are potential materials for a non-enzyme glucose biosensor.</P>
Vuong, Phan Quoc,Kim, Hongjoo,Luan, Nguyen Thanh,Kim, Sunghwan Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.11
We report a simple technique for direct neutron spectroscopy using pure LaCl<sub>3</sub> crystals. Pure LaCl<sub>3</sub> crystals exhibit considerably better pulse shape discrimination (PSD) capabilities with relatively good energy resolution as compared with Ce-doped LaCl<sub>3</sub> crystals. Single crystals of pure and Ce-doped LaCl<sub>3</sub> were grown using an inhouse-developed Bridgman furnace. PSD capabilities of these crystals were investigated using <sup>241</sup>Am and <sup>137</sup>Cs sources. Fast neutron detection was tested using a<sup>252</sup>Cf source and three separate bands corresponding to electron, proton, and alpha were observed. The proton band induced by the <sup>35</sup>Cl(n,p)<sup>35</sup>S reaction can be used for direct neutron spectroscopy because proton energy is proportional to incident neutron energy. Owing to good scintillation performance and excellent PSD capabilities, pure LaCl<sub>3</sub> is a promising candidate for space detectors and other applications that necessitate gamma/fast neutron discrimination capability.
최칠성,Quoc Vuong Nguyen,김낙중 한국고분자학회 2010 Macromolecular Research Vol.18 No.3
We report photorefractive (PR) polymer composites doped with 2-piperidino-5-thienylmalononitrile chromophore. The PR polymer composites showed a glass transition temperature of 25~27 oC, good transparency at 633 nm and long shelf lifetimes at room temperature. The PR polymer composites with a thickness of 100 μm showed a maximum diffraction efficiency of 77~91% and a rapid response time of 110~980 ms at the glass transition temperature. In addition, the composite C3 was observed at a video-rate response time at 35 oC.
Quang Nguyen Duy,김홍주,Vuong Phan Quoc,Ton Nguyen Duc,남욱원,박원기,손종대,최영준,김성환,윤석원,예성준 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.3
We propose an overall procedure for measuring and unfolding fast neutron spectra using a trans-stilbene scintillation detector. Detector characterization was described, including the information on energy calibration, detector resolution, and nonproportionality response. The digital charge comparison method was used for the investigation of neutron-gamma Pulse Shape Discrimination (PSD). A pair of values of 600 ns pulse width and 24 ns delay time was found as the optimized conditions for PSD. A fitting technique was introduced to increase the trans-stilbene Proton Response Function (PRF) by 28% based on comparison of the simulated and experimental electron-equivalent distributions by the Cf-252 source. The detector response matrix was constructed by Monte-Carlo simulation and the spectrum unfolding was implemented using the iterative Bayesian method. The unfolding of simulated and measured spectra of Cf-252 and AmBe neutron sources indicates reliable, stable and no-bias results. The unfolding technique was also validated by the measured cosmic-ray induced neutron flux. Our approach is promising for fast neutron detection and spectroscopy.
What Influences Decision on Seasoned Equity Offerings of Listed Vietnamese Companies?
LE, Long Hau,NGUYEN, Thi Binh Nhi,PHAM, Xuan Quynh,VUONG, Quoc Duy,LE, Tan Nghiem Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.5
This paper investigates the determinants on decision to conduct seasoned equity offerings (SEOs) of listed companies on the Ho Chi Minh Stock Exchange in Vietnam. Seasoned equity offerings (SEOs) are defined as the issue of more stocks by a firm to raise more capital after a primary issue. Using panel data collected from audited financial statements of 99 listed companies on the Ho Chi Minh Stock Exchange during 2014-2018, the study employs a logit regression model by fixed effects method to examine factors that affect the decision to implement seasoned equity offerings of those companies. The findings of this study show that profit, revenue growth and company's size have a positively significant impact on the decision, while dividend pay-out ratio negatively significantly influences the equity issuing decision. Furthermore, these results are robust after controlling for the forms of equity offerings, i.e. bonus stocks, stock dividends and rights to buy shares. These findings are consistent with economic theories such as agency theory, pecking order theory, and growth opportunity theory, and also could be explained by the real situations of the Vietnamese stock exchange. This study has important implications for corporate managers, policy makers and investors.
Rate of Phonon Excitation and Conditions for Phonon Generation in Rectangular Quantum Wires
Tran Cong PHONG,Dinh Quoc VUONG,Le DINH,Nguyen Quang BAU 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Phonon generation via the Cerenkov eect in rectangular quantum wires is theoretically studied based on the quantum kinetic equation for the phonon population operator. Analytical expressions for the rate of change of the phonon population and conditions for phonon generation are obtained. Numerical results for the speci.c rectangular quantum wires show that the amplitude of the laser .eld must satisfy additional conditions that are dierent in comparison with those of the other works. The dierences between the generation of acoustic phonon and optical phonon are considered.
Chemical profiles and biological activities of essential oil of Citrus hystrix DC. peels
Do Minh Long,Le Pham Tan Quoc,Tran Thi Phuong Nhung,Vuong Bao Thy,Nguyen Le Quynh Nhu 한국식품저장유통학회 2023 한국식품저장유통학회지 Vol.30 No.3
Essential oil (EO) was extracted from the peel of Citrus hystrix DC. originating from Tinh Bien, An Giang province (Vietnam), using steam distillation. The study aimed to determine some physicochemical properties of Citrus hystrix peel EO (ChpEO), including the acid value (AV), saponification value (SV), ester value (EV), density, specific gravity, and freezing point. The chemical composition was also analyzed by gas chromatography-mass spectrometry (GC-MS). Compounds like β-pinene (30.19%), D-limonene (22.15%), and sabinene (21.37%), with antioxidant and antibacterial properties, had a relatively high content. The EO was also capable of inhibiting the growth of both Gram-positive and Gram-negative bacteria, including Pseudomonas aeruginosa (ATCC 27853), Staphylococcus aureus (ATCC 25923), Salmonella typhimurium (ATCC 13311), and Bacillus cereus (ATCC 11778) specifically.