title: Flame-spray-made undoped zinc oxide films for gas sensing applications.
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 NO(2), C(2)H(5)OH and SO(2) were found to be 33, 7 and 3, respectively. The sensors showed a great selectivity towards NO(2) at high working temperature (at 300 °C), while small resistance variations were observed for C(2)H(5)OH and SO(2), respectively.
authors.affiliation: Nanoscience Research Laboratory, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand. doramon_koygy@hotmail.com
authors.forename: Nittaya
authors.initials: N
authors.lastname: Tamaekong
authors.forename: Chaikarn
authors.initials: C
authors.lastname: Liewhiran
authors.forename: Anurat
authors.initials: A
authors.lastname: Wisitsoraat
authors.forename: Sukon
authors.initials: S
authors.lastname: Phanichphant
mesh_terms: D005740:Gases / Q000032:analysis*; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission / Q000379:methods; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes; D013499:Surface Properties; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D005740:Gases; D015034:Zinc Oxide