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Nguyen, Duc Anh,Oh, Hye Min,Duong, Ngoc Thanh,Bang, Seungho,Yoon, Seok Jun,Jeong, Mun Seok American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.12
<P>Hybrid structures of two-dimensional (2D) materials and quantum dots (QDs) are particularly interesting in the field of nanoscale optoelectronic devices because QDs are efficient light absorbers and can inject photocarriers into thin layers of 2D transition-metal dichalcogenides, which have high carrier mobility. In this study, we present a heterostructure that consists of a monolayer of tungsten diselenide (ML WSe<SUB>2</SUB>) covered by nitrogen-doped graphene QDs (N-GQDs). The improved photoluminescence of ML WSe<SUB>2</SUB> is attributed to the dominant neutral exciton emission caused by the n-doping effect. Owing to strong light absorption and charge transfer from N-GQDs to ML WSe<SUB>2</SUB>, N-GQD-covered ML WSe<SUB>2</SUB> showed up to 480% higher photoresponsivity than that of a pristine ML WSe<SUB>2</SUB> photodetector. The hybrid photodetector exhibits good environmental stability, with 46% performance retention after 30 days under ambient conditions. The photogating effect also plays a key role in the improvement of hybrid photodetector performance. On applying the back-gate voltage modulation, the hybrid photodetector shows a responsivity of 2578 A W<SUP>-1</SUP>, which is much higher than that of the ML WSe<SUB>2</SUB>-based device.</P> [FIG OMISSION]</BR>
Innovation Capacity of Student: A Case Study in Vietnam
Anh Duc DO,Nguyen Nguyen Thao PHAM,Thi Minh Phuong NGUYEN,Van Son TU,Cam Nhung NGUYEN,Hai Duong NGUYEN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5
This study aimed to explore the factors affecting the innovation capacity of students at the National Economics University, Vietnam. Researchers used the innovation capacity model based on six factors, including personality traits, future orientation, creative skills, social interaction, content knowledge, and management skills. The empirical analysis used data from the survey of 303 students at National Economics University, Vietnam, with reliable tools (SPSS 26.0 software). The data were analyzed by testing the reliability of the scales, correlation analysis, and Pearson’ Linear Correlation Coefficient, exploratory factor analysis, as well as regression model based on the survey data. The research results identified the following factors affecting innovation capacity of students: management skills, social interaction, and personality traits have the strongest impact on innovation capacity of students; content knowledge has the following strongest effects on innovation capacity of students; and finally the creative skills that affects on innovation capacity of students. There is also a positive relationship between all the factors and innovation capacity of students. The result can serve as useful reference sources for scholars who are interested in the innovation field. It also helps university’s managers and policymakers build the appropriate environment to improve innovation capacity of students.
Effect of Nip Force on Ink Transfer in High Resolution Roll-to-Roll Printing
Nguyen Ho Anh Duc,신기현,이창우 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.3
In this paper, the effect of the nip force on the ink transfer in gravure printings was investigated. An adhesive force-based ink transfermodel was suggested. This model is a function of the contact length between the ink and the substrate. The static simulation of theelastic deformation of the substrate was implemented under different nip forces. The simulation showed that the contact length (LIS)was increased as the nip force increased. Accordingly, the ink transfer ratio was increased as the nip force increased due to anincreased contact length LIS. However, the fidelity of the printed pattern at high resolutions could deteriorate if the nip pressure wastoo high, especially when the doctoring ratio was greater than 1. Finally, experiments were conducted to verify the effect of the nipforce, which showed good agreements with predicted results. The results of this study may be used as practical guidelines indetermining the optimal range of the nip force in R2R gravure printing at high resolutions.
Nguyen, Ho Anh Duc,Lee, Sang Hoon,Shin, Kee-Hyun,Lee, Sangyoon IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.5
<P>One of the major factors that determine the performance of printed parallel-plate capacitors is the thickness of the dielectric layer; the thickness is affected significantly by the surface roughness of the conductive layer underneath the dielectric layer. In this study, we employed a calendering process to reduce the surface roughness of the first conductive layer. After a set of experiments involving a calendering process, the Taguchi method was applied to determine the optimal setting of the process parameters in terms of speed, nip pressure, and temperature. In the Taguchi method, a three-level orthogonal array was used to decide the signal-to-noise ratio. In addition, analysis of variance and F-test values were used to determine the most significant process parameters that affect the output, i.e., capacitance. Validation tests were carried out using the optimal levels of the process parameters and the results were presented. These results can be used as a practical guideline for determining optimal parameters in a calendering process for printed electronics applications. (C) 2014 The Japan Society of Applied Physics</P>
Nguyen Thi Thuy,Phuong Dinh Tam,Mai Anh Tuan,Anh-Tuan Le,Le Thi Tam,Vu Van Thu,Nguyen Van Hieu,Nguyen Duc Chien 한국물리학회 2012 Current Applied Physics Vol.12 No.6
The present paper introduces a facile and cost-effective route for the direct dispersion of multi-walled carbon nanotubes (MWCNTs) in DNA solution. Their application in detecting Escherichia coli O157:H7using DNA biosensorwas demonstrated. The dispersion state of theMWCNTswas characterized via UVeVis spectroscopy, transmission electron microscopy, and field emission scanning electron microscopy. The interaction between DNA sequence and the MWCNTs was investigated using Raman spectroscopy and Fourier transform infrared spectroscopy. As-obtainedMWCNT solutionwas used in the preparation of DNA sensor. Results revealed that the developed DNA sensor can detect a DNA target as low as 1 nM in a buffer solution. The sensitivity of the DNA sensor reached approximately 0.19 nM/mV. The effect of dispersion parameters, including pH values, DNA concentration, ion strength, and sonication time, on sensor response was also studied. TheDNA sensor can respondwell to 120 min of sonication time, a pH value of 9, and 20 mM of DNA sequence concentration. The results of the present study showed a potential application of the DNA sensor in the detection of Escherichia coli O157:H7.
Magnetocaloric Effect in Fe-Ni-Zr Alloys Prepared by Using the Rapidly-quenched Method
Nguyen Huy Dan,Nguyen Huu Duc,Tran Dang Thanh,Nguyen Hai Yen,Ngac An Bang,Do Thi Kim Anh,판더롱,유성초 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Fe90−xNixZr10 (x = 0, 5, 10, 15, 20 and 25) ribbons with various thicknesses were prepared byusing a melt-spinning technique. The Curie temperature, TC, of the alloys dramatically decreasedfrom 960 K to room temperature at high quenching rates. When the alloys had an amorphousstructure, their TC strongly depended on the Ni concentration. The maximum entropy change,|Sm|max, with H = 12 kOe, of the alloys was around 1 J·kg−1K−1 at room temperature. Onthe other hand, the full width at half maximum the entropy-change peak was quite large, 85 K,which was suitable for applications in magnetic refrigerators at room temperature.