UV-enhanced acetone gas sensing of Co3O4-decorated ZnS nanorod gas sensors

Co 3 O 4 -decorated ZnS nanorods were synthesized by the thermal evaporation of ZnS powders followed by a sol-gel process for Co 3 O 4 -decoration. The acetone gas sensing properties of multiple-networked pristine and Co 3 O 4 -decorated ZnS nanorod sensors were examined. The diameters of the Co 3 O...

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Bibliographic Details
Published inElectronic materials letters Vol. 11; no. 4; pp. 572 - 579
Main Authors Park, Sunghoon, Sun, Gun-Joo, Kim, Soohyun, Lee, Sangmin, Lee, Chongmu
Format Journal Article
LanguageEnglish
Published Seoul The Korean Institute of Metals and Materials 01.07.2015
대한금속·재료학회
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ISSN1738-8090
2093-6788
DOI10.1007/s13391-015-5051-8

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Summary:Co 3 O 4 -decorated ZnS nanorods were synthesized by the thermal evaporation of ZnS powders followed by a sol-gel process for Co 3 O 4 -decoration. The acetone gas sensing properties of multiple-networked pristine and Co 3 O 4 -decorated ZnS nanorod sensors were examined. The diameters of the Co 3 O 4 nanoparticles ranged from 4 to 20 nm. The multiple networked pristine ZnS nanorods and Co 3 O 4 -decorated ZnS nanorod sensors showed responses of 156–364% and 198–1,650% to 10–500 ppm of acetone at room temperature under UV illumination at 2.2 mW/cm 2 , respectively. The response and recovery times of the ZnS nanorod sensor at 500 ppm of acetone was reduced from 52 s to 26 s and from 192 s to 110 s, respectively, by Co 3 O 4 -decoration. The responses of the sensors exhibited strong dependence on the UV illumination intensity. The responses of the pristine ZnS nanorod and Co 3 O 4 -decorated ZnS nanorod sensors to 500 ppm of acetone at room temperature increased from 112 to 364% and from 132 to 1650%, respectively. This paper discusses the underlying mechanisms of the enhanced response of the ZnS nanorod sensor to acetone gas by Co 3 O 4 -decoration and UV irradiation.
Bibliography:G704-SER000000579.2015.11.4.017
ISSN:1738-8090
2093-6788
DOI:10.1007/s13391-015-5051-8