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RISS 인기검색어
- 검색키워드
- 저자 : Guishan Liu (검색결과 4 건)
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Multistep Controllability Synthesis and Growth Mechanism of ZnO Nanopagoda for Schottky Diode Device
Yang Liu,Guishan Liu,Yongbing Wang,Wenyuan Gao,Hongshun Hao,Bopu Huang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2
Ordered ZnO arrays with a peculiar nanostructure were synthesized by a multistep synthesis process. The first step was the preparation of ZnO seed to induce the formation of ZnO array via potentiostatic electrodeposition method using a typical three electrode set-up. The second step was fabricating ZnO array along seed by Chemical Bath Deposition. Structural analysis of ZnO was carried out with X-ray diffraction (XRD), which showed a hexagonal wurtzite structure, and the selected area electron diffraction (SAED) patterns indicated that nanocrystalline is a part of monocrystal. The scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to study the microstructure, and showed a pagoda-like microstructure with a tiny top and large bottom, which had an average top diameter of exceeding 800 nm at seeddepositing time of 60 s, and then growth mechanisms are subsequently given a further explanation, viewed from kinetics and thermodynamics. In addition, the current–voltage curves of schottky diode devices with ZnO nanopagoda arrays revealed that ZnO films arrays along grown ZnO seed had a higher reverse saturation current than ZnO films grown without seed, which are 1.48 x 10-6 A and 1.32 x 10-8 A, respectively. The minimum turn-on voltage of the diode with ZnO seed deposited 60 s is 0.18 V, without seed is 0.52 V.
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Effect of sintering atmosphere on the structure and dielectric properties of BSIT ceramics
Yue Liu,Kunzhi Luan,Jiahao Xu,Zhen Wang,Yike He,Guishan Liu 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.4
In this paper, the effects of O2 and N2 sintering atmospheres on the physical phase and microstructure of BSIT ceramics wereinvestigated by using In3+-doped BST ceramics as the research object. And then the dielectric properties of the ceramics inthe frequency range of 20Hz-300000 Hz were investigated by constructing ceramic capacitors. The results show that theceramic sintered in N2 atmosphere has a denser morphology and a higher dielectric constant of 862 compared with the ceramicsintered in O2 atmosphere, and the dielectric loss is reduced by about 39% in the high frequency stage.
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Low-Cost Flexible Strain Sensor Based on Thick CVD Graphene
Bailiang Chen,Ying Liu,Guishan Wang,Xianzhe Cheng,Guanjun Liu,Jing Qiu,Kehong Lv 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.11
Flexible strain sensors, as the core member of the family of smart electronic devices, along with reasonable sensing range and sensitivity plus low cost, have rose a huge consumer market and also immense interests in fundamental studies and technological applications, especially in the field of biomimetic robots movement detection and human health condition monitoring. In this paper, we propose a new flexible strain sensor based on thick CVD graphene film and its low-cost fabrication strategy by using the commercial adhesive tape as flexible substrate. The tensile tests in a strain range of ~30% were implemented, and a gage factor of 30 was achieved under high strain condition. The optical microscopic observation with different strains showed the evolution of cracks in graphene film. Together with commonly used platelet overlap theory and percolation network theory for sensor resistance modeling, we established an overlap destructive resistance model to analyze the sensing mechanism of our devices, which fitted the experimental data very well. The finding of difference of fitting parameters in small and large strain ranges revealed the multiple stage feature of graphene crack evolution. The resistance fallback phenomenon due to the viscoelasticity of flexible substrate was analyzed. Our flexible strain sensor with low cost and simple fabrication process exhibits great potential for commercial applications.
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Jiangyong Yu,Mei Guo,Guishan Liu,Jingjing Zhang,Naiyun Fan,Xiaorui Li,Yourui Sun,Jiangtao Yuan,Rui Huang 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.4
The aim of the present study was to evaluate the effectiveness of Lycium barbarum polysaccharide (LBP) on lipid oxidation and protein degradation in Tan sheep meatballs during the frozen period. The meatballs were treated with LBP at 0.01%, 0.02%, and 0.03% and stored at –18±1℃ for 0, 3, 6, 9, and 12 weeks. The effects of LBP treatment were investigated using the contents of total volatile basic nitrogen (TVB-N), texture profile (TP), thiobarbituric acid reactive substances (TBARS), colour, and pH values, compared with 0.02% butylated hydroxytoluene treatment and the blank control. The results showed that LBP treatment significantly decreased TBARS content compared with the control, which confirmed LBP to be a highly effective component in preventing lipid oxidation of Tan sheep meatballs during frozen storage, and protein degradation in Tan sheep meatballs had a significant inhibition effect because of TVB-N value reduction. In addition, the colour, TP and pH values of meatballs treated with LBP were improved dramatically. To further determine the quality changes of the blank control and all treated groups during storage, the comprehensive score evaluation equation based on principal component analysis was obtained: Y=0.51632Y1+0.29589Y2 (cumulative contribution rate=81.221%), and the 0.02% LBP-treated group had a higher comprehensive score than the other groups, and the quality of LBP-treated meatballs was better as well. In summary, LBP may reduce or inhibit lipid oxidation and protein degradation, and enhance overall quality and shelf-life in prepared meat products.
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