Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 147, Issue 2, Pages 488-494Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.02.063
Keywords
Heterojunction; Thin films; LPG sensor; Selectivity; LPG sensor model; Stability
Funding
- Department of Science and Technology, New Delhi [SR/S2/CMP-82/2006]
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The p-polyaniline/n-ZnO thin film heterojunction sensor for room temperature LPG detection was fabricated by electrodepositing polyaniline on chemical bath deposited ZnO film. The heterojunction showed rectifying behavior indicating the formation of a diode with ideality factor 1.10. The formation of diffusion free interface of heterojunction was confirmed from cross-sectional FESEM. The heterojunction sensor has quick and high response towards LPG as compared to N-2 and CO2 and exhibited maximum response of 81% upon exposure of 1040 ppm of LPG. The LPG sensing mechanism for heterojunction is modeled through change in height of barrier potential. (C) 2010 Elsevier B.V. All rights reserved.
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