Authors: Wongchoosuk, C.¹; Choopun, S.²; Tuantranont, A.³; Kerdcharoen, T.⁴

Source: Materials Research Innovations, Volume 13, Number 3, September 2009 , pp. 185-188(4)

Publisher: Maney Publishing

Abstract:

Pure and 10% w/w Au-doped zinc oxide (ZnO) nanostructure sensors were produced and used as sensing devices in a portable electronic nose (E-nose). The nanosensors were prepared using thermal oxidation technique with sintering temperature at 700°C under oxygen atmosphere at a flow rate of 500 mL min^–1. The sensors were demonstrated to be sensitive to various volatile organic compounds (VOCs), especially ethanol vapour. The E-nose even with only two sensors was efficient to discriminate a number of selected VOCs. The Au-doped sensor shows a significant improvement of sensitivity. The portable E-nose can detect the difference between alcohol beverages and alcohol solutions and can distinguish the difference of white and red wines having the same percentage of alcohol.

Keywords: GAS SENSOR; E-NOSE; AU-DOPED ZINC OXIDE; NANOSTRUCTURE; ALCOHOL

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/143307509X437572

Affiliations: 1: Department of Physics and Center of Nanoscience and Nanotechnology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand 2: Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 3: Nanoelectronic and MEMS Lab, National Electronic and Computer Technology Center, Pathumthani, Bangkok 12120, Thailand 4: Department of Physics and Center of Nanoscience and Nanotechnology, Faculty of Science, Mahidol University, Bangkok 10400, NANOTEC Center of Excellence at Mahidol University, National Nanotechnology Center, Thailand;, Email: sctkc@mahidol.ac.th

Publication date: 2009-09-01

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