Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 176, Issue -, Pages 675-684Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.09.094
Keywords
SnO2 thin film; WO3; Heterojunction; NO2 gas; Sensing mechanism
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The surface of SnO2 thin film with porous microstructure has been integrated with WO3 nanoclusters using pulsed laser deposition technique and a novel sensor structure has been realized for detecting low concentration of NO2 gas (10 ppm) at a low operating temperature (100 degrees C). The content of WO3 was found to be very critical and integration of 8 nm thick nanoclusters exhibits a high sensor response of 5.4 x 10(4) towards 10 ppm NO2 gas with fast response (67 s). The origin of enhanced response characteristics has been analysed in the light of Fermi level and spillover mechanisms and are correlated with the reaction kinetics of NO2 gas on the sensor surface. (C) 2012 Elsevier B.V. All rights reserved.
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