Flame-spray-made undoped zinc oxide films for gas sensing applications

• Main Authors: Tamaekong N., Liewhiran C., Wisitsoraat A., Phanichphant S.
• Format: Article
• Language: English
• Published: 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-77957240454&partnerID=40&md5=a9963a8bd9e5e1243842c4bc0d5b2f4f; http://www.ncbi.nlm.nih.gov/pubmed/22163630; http://cmuir.cmu.ac.th/handle/6653943832/5653
• Institution: Chiang Mai University

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. © 2010 by the authors.