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Hien, Vu Xuan,Heo, Young-Woo American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.33
<P>We introduce a simple process for the fabrication of SiO2 films embedded with beta-Sn-rich nano/microspheres. Sn spheres with maximum and minimum sizes of 10 mu m (near the SiO2 surface) and 5 nm (at the Si/SiO2 interface) were grown within a 0.7-5.7 mu m-thick SiO2 layer by evaporating SnO powders onto an Si (100) substrate for 1-600 min at 600-900 degrees C and 0.001-5.0 Torr. A possible growth mechanism of these materials is discussed. The current-voltage characteristics of the as-fabricated samples were investigated to identify potential applications. During these tests, small flashes of light and the presence of damaged areas were observed at the oxide surfaces of the samples using an optical camera and a field emission scanning electron microscope, respectively. The electrical breakdown and shutdown of the devices observed in the current-voltage curves were attributed to the destruction of the SiO2 surface. In addition, the current-time responses show that the size of the damaged regions can be controlled by the voltage and duration of the applied stress, and are independent of the size and shape of the electrodes. The present materials thus possess great potential for applications devices.</P>
Xuan Hung NGUYEN(Xuan Hung NGUYEN ),Thuy Dương TRAN(Thuy Dương TRAN ),Phan Hoai Diem VU(Phan Hoai Diem VU ),Yen Chi DINH(Yen Chi DINH ),Thi Mai Huong DUONG(Thi Mai Huong DUONG ),Thi Ngoc Hien THAN(Thi 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9
The goal of the study is to examine and assess how the factors of logistics service quality provided by logistics service providers influence customer loyalty and satisfaction in Vietnam. This study employs samples of the Kansei technique. The article’s data was gathered through an online survey of 388 distinct Vietnamese customers who used logistics services before and during the Covid-19 outbreak. After the data was obtained, it was evaluated using SmartPLS 3.0’s Cronbach’s Alpha test and structural equation model (SEM). Staff service quality, operational service quality, and technical service quality are the three factors that determine the quality of logistics services in the study. Out of the 10 proposed hypotheses, research findings show that five are acceptable. The Covid-19 Pandemic in Vietnam had a significant impact on all dimensions, but it had no effect on how satisfied customers were with the logistics service providers. Nevertheless, loyalty is considerably influenced by only one factor, which is customer satisfaction, and customer trust moderates the relationship between these two factors. As a consequence of that, several managerial implications have been proposed to help logistics service providers improve their services to attract and keep Vietnamese customers using their service in the long term.
Hien, Vu Xuan,You, Jae-Lok,Jo, Kwang-Min,Kim, Se-Yun,Lee, Joon-Hyung,Kim, Jeong-Joo,Heo, Young-Woo Elsevier 2015 Vacuum Vol.111 No.-
<P><B>Abstract</B></P> <P>Typical sputtering conditions based on substrate temperature, sputtering time and oxygen partial pressure to grow thin film, submicron-sized rods and trees of Cu<SUB>2</SUB>O on glass substrates from metallic Cu targets were investigated. The submicron-rods with diameters of 100–700 nm and lengths of 2–8 μm were synthesized. The abundance of Cu species, which is modulated by the Ar/O<SUB>2</SUB> ratio during the sputtering process affects directly to the growths of the Cu<SUB>2</SUB>O branches on the bodies of the submicron-rods. Transmission electron microscopy and elemental mapping reveal that metallic Cu is existed on the heads of the Cu<SUB>2</SUB>O rods. Finally, the formation model of the submicron-sized rods and trees of Cu<SUB>2</SUB>O is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cu<SUB>2</SUB>O submicron-sized rods and trees were synthesized by RF magnetron sputtering. </LI> <LI> Effects of substrate temperature and sputtering time on the formation of Cu<SUB>2</SUB>O submicron-rods were investigated. </LI> <LI> The morphologies of Cu<SUB>2</SUB>O were tailored by Ar/O<SUB>2</SUB> ratios during the sputtering. </LI> <LI> A formation model was proposed and illustrated in detail. </LI> </UL> </P>
Fabrication Process of Single CuO Nanowire Devices
Vu, Xuan Hien,Jo, Kwang-Min,Kim, Se-Yun,Lee, Joon-Hyung,Kim, Jeong-Joo,Heo, Young-Woo The Korean Vacuum Society 2014 Applied Science and Convergence Technology Vol.23 No.3
One-dimensional nanostructures such as nanowires have been extensively investigated as a promising type of material for applications of nanoscale technology. The fabrication of single-nanowire devices are consequently important and interesting. This study introduced a feasible method for growing CuO nanowires on Cu foils. The nanowires had diameters of 10~150 nm and lengths of more than $7{\mu}m$ and were grown by means of thermal oxidation in a vacuum. They were entirely and uniformly grown over the Cu foil surfaces and could be extracted and dispersed in an ethanol solution for further purposes. In addition, a simple fabrication method for realizing device functionality from a single CuO nanowire was reported. Fabricated devices were carefully checked by field-emission scanning electron microscopy (SEM). The probability of the realization of a single-CuO-nanowire device relative to that of all other types was estimated to be around 25%. Finally, the I-V characteristics of the devices were analyzed.
Effect of Surface Treatment on the Formation of NiO Nanomaterials by Thermal Oxidation
Hien, Vu Xuan,Heo, Young-Woo The Korean Vacuum Society 2016 Applied Science and Convergence Technology Vol.25 No.6
Thermal oxidation has significant potential for use in synthesizing metal-oxide nanostructures from metallic materials. However, this method has limited applicability to the synthesis of multi-morphology NiO from Ni foil. Techniques consisting of mechanical and chemical approaches were used to pre-treat the Ni foil (prior to oxidation) to promote the formation of nanowires and nanoplates on the NiO layer. These morphologies were realized on the Ni foils scratched by sand paper and a knife, respectively, and subsequently heat-treated at $500^{\circ}C$ for 24 h. Small nanowires (diameter: <10 nm) formed on the Ni foil treated by absolute $HNO_3$ and then oxidized at $500^{\circ}C$ for 24 h. The formation of various morphologies (on the pre-treated Ni foil), which differ from that formed in the case of pristine Ni foil after oxidation, may be attributed to the surface melting phenomenon that occurs during the nucleation process.
Effect of Surface Treatment on the Formation of NiO Nanomaterials by Thermal Oxidation
Vu Xuan Hien,허영우 한국진공학회 2016 Applied Science and Convergence Technology Vol.25 No.6
Thermal oxidation has significant potential for use in synthesizing metal-oxide nanostructures from metallic materials. However, this method has limited applicability to the synthesis of multi-morphology NiO from Ni foil. Techniques consisting of mechanical and chemical approaches were used to pre-treat the Ni foil (prior to oxidation) to promote the formation of nanowires and nanoplates on the NiO layer. These morphologies were realized on the Ni foils scratched by sand paper and a knife, respectively, and subsequently heat-treated at 500oC for 24 h. Small nanowires (diameter: <10 nm) formed on the Ni foil treated by absolute HNO3 and then oxidized at 500oC for 24 h. The formation of various morphologies (on the pre-treated Ni foil), which differ from that formed in the case of pristine Ni foil after oxidation, may be attributed to the surface melting phenomenon that occurs during the nucleation process.