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RISS 인기검색어
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- 저자 : Yingang Gui (검색결과 4 건)
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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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Qingfang Zhang,Yingang Gui,Han Qiao,Xianping Chen,Lingzhi Cao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
GIS plays an irreplaceable role in the modern electrical system. However, partial discharge will inevitablyoccur under insulation defect conditions and may lead to serious insulation malfunction. The online monitoringmethod based on gas sensor is a feasible method to diagnose the severity of partial discharge inGIS. In this paper, metal oxide (TiO2, Fe2O3, NiO) cluster-modified single-layer graphene was proposed asa novel gas sensor to detect the characteristic components of SF6 decomposition products, SOF2 andSO2F2. Density functional theory calculations were carried out to study the gas adsorption and sensingmechanisms. The adsorption structures of gas molecules and the metal oxide cluster-modified singlelayergraphene were built and optimized. Then, the most stable structure was selected to analyze the correspondingadsorption parameters. Calculation results showed that metal oxides decoration reduces theenergy gap, improving the electrical conductivity and enhancing the adsorption activity of the graphenesurface. According to DOS and CDD analyses, TiO2 modification obtained the best adsorption effect. Calculation results show that the metal-oxide-modified graphene sensor provides an effective methodfor effectively estimating the operating state of GIS by detecting SF6 decomposition products.
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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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NiO/Ti3C2Tx MXene nanocomposites sensor for ammonia gas detection at room temperature
Jiacheng Yang,Yingang Gui,Yunfeng Wang,Shasha He 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
Poultry feeding will lead to a large amount of ammonia(NH3) emissions, which will seriously affect thequality of meat. Herein, we report a resistive sensor based on NiO/Ti3C2Tx sensitive nanocompositesfor NH3 detection in a natural environment. The nanocomposites were prepared by modifying twodimensional(2D) Ti3C2Tx MXene with nickel oxide (NiO) nanoparticles (NPs) by a simple ultrasonicself-assembly method. The results show that the NiO/Ti3C2Tx MXene nanocomposite sensor exhibits ahigh sensitivity of 6.13 % to 50 ppm NH3 at room temperature (RT), which is 8.7 times higher than thatof the pure Ti3C2Tx MXene sensor. In other words, the addition of NiO NPs can significantly enhance thegas-sensing response of pure Ti3C2Tx MXene to NH3 at RT. Meanwhile, the response and recovery timewere also effectively improved (63 s/19 s) due to the addition of NiO NPs. Furthermore, the responseof the nanocomposite sensor to volatile organic compounds (VOCs) was investigated, and the resultsshowed its prospective and high selectivity. On the other hand, the nanocomposite sensor exhibits goodrepeatability and long-term stability. Finally, a possible sensing mechanism is proposed to improve sensorperformance.
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