Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 41, Pages 10092-10097Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.08.046
Keywords
ZnO; Thin films; Mesoporous; CBD; LPG sensor
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Funding
- Department of Science and Technology, New Delhi [SR/S2/CMP-82/2006]
- DST
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In the present work, we report base free chemical bath deposition (CBD) of mesoporous zinc oxide (ZnO) thin films from urea containing bath for liquefied petroleum gas (LPG) sensor application. Mesoporous morphology with average pore size similar to 2 mu m and wurtzite crystal structure are confirmed from scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The surface of ZnO is hydrophobic with water contact angle 128 +/- 1 degrees. Optical study reveals the presence of direct bad gap with energy 3.24 eV. The gas sensing study reveals the mesoporous ZnO is highly selective towards LPG as compared with CO(2) and maximum LPG response of 52% is achieved upon the exposure of 3900 ppm LPG at 573 K as well as good reproducibility and short response/recovery times. (C) 2011 Elsevier B.V. All rights reserved.
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