Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 181, Issue -, Pages 417-423Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.01.056
Keywords
Polypyrrole; TiO2; Liquefied petroleum gas; Sensor; Heterojunction
Funding
- 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
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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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