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Sensors 2010, 10(8), 7863-7873; doi:10.3390/s100807863
Article

Flame-Spray-Made Undoped Zinc Oxide Films for Gas Sensing Applications

1
,
2
,
3
 and
1,*
1 Nanoscience Research Laboratory, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand 2 Department of Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand 3 National Electronics and Computer Technology Center, Pathumthani, 12120, Thailand
* Author to whom correspondence should be addressed.
Received: 7 July 2010 / Revised: 16 August 2010 / Accepted: 20 August 2010 / Published: 23 August 2010
(This article belongs to the Special Issue Gas Sensors - 2010)
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Abstract

Using zinc naphthenate dissolved in xylene as a precursor undoped ZnO nanopowders were synthesized by the flame spray pyrolysis technique. The average diameter and length of ZnO spherical and hexagonal particles were in the range of 5 to 20 nm, while ZnO nanorods were found to be 5–20 nm wide and 20–40 nm long, under 5/5 (precursor/oxygen) flame conditions. The gas sensitivity of the undoped ZnO nanopowders towards 50 ppm of NO2, C2H5OH and SO2 were found to be 33, 7 and 3, respectively. The sensors showed a great selectivity towards NO2 at high working temperature (at 300 °C), while small resistance variations were observed for C2H5OH and SO2, respectively.
Keywords: undoped ZnO; flame spray pyrolysis; NO2; C2H5OH; SO2; gas sensor undoped ZnO; flame spray pyrolysis; NO2; C2H5OH; SO2; gas sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tamaekong, N.; Liewhiran, C.; Wisitsoraat, A.; Phanichphant, S. Flame-Spray-Made Undoped Zinc Oxide Films for Gas Sensing Applications. Sensors 2010, 10, 7863-7873.

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