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- 저자 : Lingna Xu (검색결과 3 건)
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Gas-sensing properties of Ptn-doped WSe2 to SF6 decomposition products
Lingna Xu,Yingang Gui,Wenjun Li,Qiaomei Li,Xianping Chen 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Two-dimensional transition metal disulfides (TMDs) has attracted considerable attention due to itsexcellent physicochemical properties. In order to detect the SF6 decomposition products, transition metalPt cluster doping was chosen to enhance the adsorption property of intrinsic WSe2 monolayer. Theadsorption of SO2, SOF2 and SO2F2 on Ptn (n = 1–3) doped WSe2 monolayer is studied based on thefirstprinciplecalculation. The adsorption energy, charge transfer, and density of states of the interactionbetween the target gas molecules and Ptn-WSe2 were studied. The calculation results showed that Pt3doping dramatically enhances the adsorption of WSe2 to SO2 and SOF2 and SO2F2 molecules. Meanwhile,electrons transfer from Ptn-WSe2 surface to these three kinds of target gas molecules, reducing theconductivity of the adsorption system in different degrees. The results of this study not only haveimportant significance for explaining the sensing mechanism of Ptn-WSe2 adsorption to SF6 gasdecomposition products, but also provide a potential material for further development of gas sensingsensors.
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Yingang Gui,Zhicheng Liu,Chang Ji,Lingna Xu,Xianping Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
In this study, the adsorption behavior of CuO-GeSe, NiO-GeSe, and Ag2O-GeSe towards the main dissolvedgases CO, CH4, C2H2, and C2H4 in transformer oil was systematically studied based on DFT. The adsorptionstructure, band structure, density of states, deformation charge density, and molecular orbit were analyzedto explore the interaction between the modified monolayers and gases. The results show thatthe adsorption of the four target gases on pristine GeSe belongs to weak physical adsorption. Metal oxidesmodification improves the conductivity of GeSe, and the formation of numerous triangular structuresmakes the modified substrates hard to deform during gas adsorption. Due to the poor gas sensitivityand extremely short recovery time of CH4 on CuO-GeSe, NiO-GeSe, and Ag2O-GeSe, these three modifiedstructures are not suitable to be used as a material for detecting CH4. The conductivity of MO-GeSechanges in different degrees after adsorbing CO, C2H2, and C2H4. The gases can be detected accordingto the different change rule of conductivity upon adsorption. In addition, gas desorption from the substratecan be achieved by controlling the temperature. This study provides a theoretical basis for theapplication of gas sensors used in DGA.
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Stable Sheet-Beam Transport in Periodic Nonsymmetric Quadrupole Field
Zhanliang Wang,Yubin Gong,Yanyu Wei,Zhaoyun Duan,Huarong Gong,Zhigang Lu,Lingna Yue,Hairong Yin,Jin Xu,Yuanbao Li,Pukun Liu,Gun-Sik Park IEEE 2010 IEEE transactions on plasma science Vol.38 No.1
<P>Stable sheet electron-beam transport is critical for sheet-beam microwave device which is attractive for high-power millimeter wave to terahertz-regime radiation. This paper studies the stable sheet-beam transport in periodic nonsymmetric quadrupole field. First, the conditions for stable round- and sheet-beam transport in periodic magnetic quadrupole field are deduced. In the deduction, we find that the symmetric quadrupole field and the space-charge field of sheet beam are not well matched. In order to settle this problem, we use periodic nonsymmetric quadrupole field instead of periodic symmetric quadrupole field to transport sheet beam. Finally, 3-D PIC simulations verify the conditions for stable sheet-beam transport and show that periodic nonsymmetric quadrupole field is intrinsically well suited for sheet-beam transport.</P>
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