상세정보
학술지
A Physicochemical Mechanism of Chemical Gas Sensors Using an AC Analysis
- 발행일
- 201306
- 출처
- Physical Chemistry Chemical Physics, v.15 no.23, pp.9361-9374
- ISSN
- 1463-9076
- 출판사
- Royal Society of Chemistry (RSC)
- 협약과제
- 13ZB1100, 스마트 융.복합 IT부품소재 기술개발, 남은수
- 초록
- 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 제안 키워드
- AC analysis, Chemical gas sensor, Electrical Modeling, Enhanced sensitivity, Impedance response, NO 2, Nanofiber sensors, Sensing mechanism, Surface Area, Tio 2, characteristic impedance