title: Flame-made Nb-doped TiO2 ethanol and acetone sensors.
abstract: Undoped TiO(2) and TiO(2) nanoparticles doped with 1-5 at.% Nb were successfully produced in a single step by flame spray pyrolysis (FSP). The phase and crystallite size were analyzed by XRD. The BET surface area (SSA(BET)) of the nanoparticles was measured by nitrogen adsorption. The trend of SSA(BET) on the doping samples increased and the BET equivalent particle diameter (d(BET)) (rutile) increased with the higher Nb-doping concentrations while d(BET) (anatase) remained the same. The morphology and accurate size of the primary particles were further investigated by high-resolution transmission electron microscopy (HRTEM). The crystallite sizes of undoped and Nb-doped TiO(2) spherical were in the range of 10-20 nm. The sensing films were prepared by spin coating technique. The mixing sample was spin-coated onto the Al(2)O(3) substrates interdigitated with Au electrodes. The gas sensing of acetone (25-400 ppm) was studied at operating temperatures ranging from 300-400 °C in dry air, while the gas sensing of ethanol (50-1,000 ppm) was studied at operating temperatures ranging from 250-400 °C in dry air.
authors.affiliation: Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand. sphanichphant@yahoo.com
authors.forename: Sukon
authors.initials: S
authors.lastname: Phanichphant
authors.forename: Chaikarn
authors.initials: C
authors.lastname: Liewhiran
authors.forename: Khatcharin
authors.initials: K
authors.lastname: Wetchakun
authors.forename: Anurat
authors.initials: A
authors.lastname: Wisitsoraat
authors.forename: Adisorn
authors.initials: A
authors.lastname: Tuantranont
mesh_terms: D000096:Acetone / Q000032:analysis*; D000431:Ethanol / Q000032:analysis*; D005740:Gases / Q000032:analysis; D053768:Metal Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D009556:Niobium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D005740:Gases; D009556:Niobium; D000096:Acetone; C009495:titanium dioxide; D000431:Ethanol; D014025:Titanium