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Journal Article
A Physicochemical Mechanism of Chemical Gas Sensors Using an AC Analysis
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- Authors
- Jaehyun Moon, Jin-Ah Park, Su-Jae Lee, Jeong-Ik Lee, Taehyong Zyung, Eui-Chol Shin, Jong-Sook Lee
- Issue Date
- 2013-06
- Citation
- Physical Chemistry Chemical Physics, v.15, no.23, pp.9361-9374
- ISSN
- 1463-9076
- Publisher
- Royal Society of Chemistry (RSC)
- Language
- English
- Type
- Journal Article
- Abstract
- Electrical modeling of the chemical gas sensors was successfully applied to TiO2 nanofiber gas sensors by developing an equivalent circuit model where the junction capacitance as well as the resistance can be separated from the comparable stray capacitance. The Schottky junction impedance exhibited a characteristic skewed arc described by a Cole-Davidson function, and the variation of the fit and derived parameters with temperature, bias, and NO 2 gas concentration indicated definitely a physicochemical sensing mechanism based on the Pt|TiO2 Schottky junctions against the conventional supposition of the enhanced sensitivity in nanostructured gas sensors with high grain boundary/surface area. Analysis on a model Pt|TiO 2|Pt structure also confirmed the characteristic impedance response of TiO2 nanofiber sensors. © 2013 the Owner Societies.
- KSP Keywords
- AC analysis, Chemical gas sensor, Electrical modeling, Enhanced sensitivity, Equivalent Circuit model, Gas concentration, Grain Boundaries, Impedance response, NO 2, Sensing mechanism, Surface Area