Response of a ZnO Single Crystal Rod-Based Chemical Sensor for Hydrogen Sulfide

Title
Response of a ZnO Single Crystal Rod-Based Chemical Sensor for Hydrogen Sulfide
Author(s)
이태진박노국박재영
Keywords
THERMAL EVAPORATION METHOD; HOT GAS DESULFURIZATION; MATRIX-ASSISTED METHOD; EPITAXIAL-GROWTH; OPTICAL-PROPERTIES; NANOWIRES; NANOSTRUCTURES; SORBENTS; REMOVAL; CLEANUP
Issue Date
201408
Publisher
AMER SCIENTIFIC PUBLISHERS
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.14, no.8, pp.6326 - 6330
Abstract
A zinc oxide single crystal rod was grown by a thermal evaporation method for application as a chemical gas-sensing material in this study. Zinc acetate (20 wt%) impregnated over activated carbon was used as the precursor for the epitaxial growth of ZnO single crystal rods. The response tests were carried out across a range of sensing temperatures (100, 150 and 200 degrees C) and the hydrogen sulfide content (10.2-51.0 ppmv) was balanced with nitrogen gas. The response of the ZnO single crystal rods grown on the gas sensors varied with the H2S content and the sensing temperature. A high response for H2S was obtained at 150 and 200 degrees C due to the high reactivity between H2S and ZnO at high temperature. Since H2S absorption rate and ZnS oxidation rate over ZnO single crystal rods at 100 degrees C lower than that at 150 and 200 degrees C, the changing rate of electric resistance decreased with the decrease of temperature. Meanwhile, a different response, which is the changing rate of electric resistance for H2S absorption and ZnS oxidation over ZnO single crystal rods at 100 degrees C, was observed with changing amount of H2S in feed gas. Therefore, it was concluded that the ZnO single crystal rods based gas sensor is operated above 200 degrees C for the shortly response time.
URI
http://hdl.handle.net/YU.REPOSITORY/31190http://dx.doi.org/10.1166/jnn.2014.8803
ISSN
1533-4880
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공과대학 > 화학공학부 > Articles
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