Citation: |
Ding Ruixue, Yang Yintang, Liu Lianxi. Working mechanism of a SiC nanotube NO2 gas sensor[J]. Journal of Semiconductors, 2009, 30(11): 114010. doi: 10.1088/1674-4926/30/11/114010
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Ding R X, Yang Y T, Liu L X. Working mechanism of a SiC nanotube NO2 gas sensor[J]. J. Semicond., 2009, 30(11): 114010. doi: 10.1088/1674-4926/30/11/114010.
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Abstract
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.-
Keywords:
- working mechanism,
- SiCNT,
- gas sensor,
- non-equilibrium Green’s function
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References
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Proportional views