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

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

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; in revised form: 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

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MDPI and ACS Style

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

AMA Style

Tamaekong N, Liewhiran C, Wisitsoraat A, Phanichphant S. Flame-Spray-Made Undoped Zinc Oxide Films for Gas Sensing Applications. Sensors. 2010; 10(8):7863-7873.

Chicago/Turabian Style

Tamaekong, Nittaya; Liewhiran, Chaikarn; Wisitsoraat, Anurat; Phanichphant, Sukon. 2010. "Flame-Spray-Made Undoped Zinc Oxide Films for Gas Sensing Applications." Sensors 10, no. 8: 7863-7873.

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