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Flame-Made Nb-Doped TiO2 Ethanol and Acetone Sensors
Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Nanoscience and Nanotechnology Program, Graduate School, Chiang Mai University, Chiang Mai, 50200, Thailand
National Electronics and Computer Technology Center, Pathumthani, 12120, Thailand
* Author to whom correspondence should be addressed.
Received: 23 October 2010; in revised form: 24 November 2010 / Accepted: 29 December 2010 / Published: 5 January 2011
Abstract: Undoped TiO2 and TiO2 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 (SSABET) of the nanoparticles was measured by nitrogen adsorption. The trend of SSABET on the doping samples increased and the BET equivalent particle diameter (dBET) (rutile) increased with the higher Nb-doping concentrations while dBET (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 TiO2 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 Al2O3 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.
Keywords: TiO2; niobium; flame spray pyrolysis; acetone and ethanol sensor
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Phanichphant, S.; Liewhiran, C.; Wetchakun, K.; Wisitsoraat, A.; Tuantranont, A. Flame-Made Nb-Doped TiO2 Ethanol and Acetone Sensors. Sensors 2011, 11, 472-484.
Phanichphant S, Liewhiran C, Wetchakun K, Wisitsoraat A, Tuantranont A. Flame-Made Nb-Doped TiO2 Ethanol and Acetone Sensors. Sensors. 2011; 11(1):472-484.
Phanichphant, Sukon; Liewhiran, Chaikarn; Wetchakun, Khatcharin; Wisitsoraat, Anurat; Tuantranont, Adisorn. 2011. "Flame-Made Nb-Doped TiO2 Ethanol and Acetone Sensors." Sensors 11, no. 1: 472-484.