期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 181, 期 -, 页码 417-423出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.01.056
关键词
Polypyrrole; TiO2; Liquefied petroleum gas; Sensor; Heterojunction
资金
- Council for Scientific and Industrial Research (CSIR), New Delhi (India) [03(1165)/10/EMR-II]
- DSA (UGC)
- PURSE
- FIST Department of Science and Technology (DST) New Delhi
In this paper, we report on the fabrication and performance of room temperature operated liquefied petroleum gas (LPG) sensor based on polypyrrole/TiO2 (Ppy/TiO2) heterojunction. Ppy/TiO2 heterojunction was prepared by sequencial depositing TiO2 film by chemical bath deposition and Ppy film by electrodeposition method. Ppy and TiO2 films were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), FTIR and thermo-emf techniques. The XRD study revealed amorphous and nanocrystalline natures for Ppy and TiO2 films, respectively. The SEMs of Ppy and TiO2 films showed cauliflower-like and densely compact morphologies respectively. Maximum gas response of 55% was observed for Ppy/TiO2 heterojunction at 1040 ppm of LPG. Relative humidity affected the gas sensing performance of heterojunction. Good stability, fast response and recovery times indicate that Ppy/TiO2 heterojunction is a one of the candidate for room temperature LPG detection. (C) 2013 Elsevier B.V. All rights reserved.
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