Flame-Made Nb-Doped TiO2 Ethanol and Acetone Sensors

Sensors

Sukon Phanichphant⁴  Chaikarn Liewhiran¹  Khatcharin Wetchakun³  Anurat Wisitsoraat² 

[1] Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand; E-Mail:;National Electronics and Computer Technology Center, Pathumthani, 12120, Thailand; E-Mails:;Nanoscience and Nanotechnology Program, Graduate School, Chiang Mai University, Chiang Mai, 50200, Thailand; E-Mail:;Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand

关键词: TiO₂;    niobium;    flame spray pyrolysis;    acetone and ethanol sensor;   

DOI  :  10.3390/s110100472

来源: mdpi

【 摘 要 】

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 (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 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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.