Journal
SENSORS
Volume 10, Issue 8, Pages 7863-7873Publisher
MDPI
DOI: 10.3390/s100807863
Keywords
undoped ZnO; flame spray pyrolysis; NO2; C2H5OH; SO2; gas sensor
Funding
- Office of Higher Education Commision, Ministry of Education
- Graduate School and Department of Chemistry, Faculty of Science, Chiang Mai University, Thailand
- National Nanotechnology Center
- National Electronics and Computer Technology Center, Pathumthani, Thailand
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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 degrees C), while small resistance variations were observed for C2H5OH and SO2, respectively.
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