期刊
JOURNAL OF SEMICONDUCTORS
卷 30, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-4926/30/11/114010
关键词
working mechanism; SiCNT; gas sensor; non-equilibrium Green's function
资金
- National Pre-Research Foundation of China [51308030201]
The working mechanism of sensors plays an important role in their simulation and design, which is the foundation of their applications. A model of a nanotube NO2 gas sensor system is established based on an (8, 0) silicon carbide nanotube (SiCNT) with a NO2 molecule adsorbed. The transport properties of the system are studied with a method combining density functional theory (DFT) with the non-equilibrium Green's function (NEGF). The adsorbed gas molecule plays an important role in the transport properties of the gas sensor, which results in the formation of a transmission peak near the Fermi energy. More importantly, the adsorption leads to different voltage current characteristics of the sensor to that with no adsorption; the difference is large enough to detect the presence of NO2 gas.
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