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

Sensors

Nittaya Tamaekong³  Chaikarn Liewhiran²  Anurat Wisitsoraat¹ 

[1] National Electronics and Computer Technology Center, Pathumthani, 12120, Thailand; E-Mail:;Department of Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand; E-Mail:;Nanoscience Research Laboratory, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand; E-Mail:

关键词: undoped ZnO;    flame spray pyrolysis;    NO₂;    C₂H₅OH;    SO₂;    gas sensor;   

DOI  :  10.3390/s100807863

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.