Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 133, Issue 2, Pages 456-461Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.03.003
Keywords
indium oxide; gas sensor; chemiresistor; hydrogen sulphide
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In2O3 whiskers and bipyramidal nano-crystals were prepared by a carbothermal method. These were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), photoluminescence and Raman spectroscopy. These were studied for application to sensing of H2S gas. The single crystal whiskers were found to be sensitive to as low as 200 ppb of H2S gas at room temperature and showed saturation in response at 10 ppm. On the other hand, the films made of bipyramids were less sensitive to H2S gas and the response was found to be a nearly linear function of concentration in a concentration range of 10-80 ppm. (C) 2008 Elsevier B.V. All rights reserved.
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