| Neck-controlled sensitivity study on nano-grain SnO_2 gas sensors |
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| 作者姓名： | 马勇 |
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| 作者单位： | College of |
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| 基金项目： | Chongqing Education Committee Foundation (No.020804) |
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| 摘 要： | 1. Introduction SnO2 is an n-type semiconductor with rutile crystal structure and with a wide band gap of about 3.6 eV. SnO2 has a wide range of applications as photo-detectors, heat mirrors, transparent electrodes for solar cells, conductive filler, thick resistors, catalysts and gas sensors. One of the most important applications of SnO2 lies in gas sensors 1]. SnO2 gas sensors have been attracting much attention 2-5] because of their many advantages over current technologies for detect…
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Neck-controlled sensitivity study on nano-grain SnO_2 gas sensors |
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| MA Yong,WANG Wanlu,LIAO Kejun College of Mathematics and Sciences,Chongqing University,Chongqing,P.R. China Dept. of Physics,Chongqing Normal University,Chongqing,P.R. China.Neck-controlled sensitivity study on nano-grain SnO_2 gas sensors[J].Journal of Chongqing University,2003,2(1). |
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| Authors: | MA Yong WANG Wanlu LIAO Kejun College of Mathematics and Sciences Chongqing University Chongqing PR China Dept of Physics Chongqing Normal University Chongqing PR China |
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| Institution: | 1. College of Mathematics and Sciences, Chongqing University, Chongqing 400044, P.R. China;Dept. of Physics, Chongqing Normal University, Chongqing 400047, P.R. China
2. College of Mathematics and Sciences, Chongqing University, Chongqing 400044, P.R. China |
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| Abstract: | The electrical potential inside a cylinder with a space charge layer is used to express the neck potential barrier of nano-SnO2 gas elements, and the neck-controlled sensitivity and the grain size effect are studied. It is shown that the sensing properties are influenced by the microstructural features, such as the grain size, the geometry and connectivity between grains, and that the neck controlled sensitivity alone is higher than the neck-grain controlled sensitivity and the difference between the neck controlled sensitivity and the neck-grain controlled sensitivity is large in the high sensitivity range for nano-SnO2 gas elements, which suggests a possible approach to the improvement of the sensitivity of a sensor by decreasing the number of necks of a nano-grain SnO2 gas element. |
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| Keywords: | gas sensors SnO2 sensitivity geometry effect |
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