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Sensors 2011, 11(1), 472-484; doi:10.3390/s110100472

Flame-Made Nb-Doped TiO2 Ethanol and Acetone Sensors

1,* , 2
Received: 23 October 2010 / Revised: 24 November 2010 / Accepted: 29 December 2010 / Published: 5 January 2011
(This article belongs to the Special Issue Gas Sensors - 2010)
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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 TiO2; niobium; flame spray pyrolysis; acetone and ethanol sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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