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Title: Ultrahigh CO sensing capability of Au-doped TiO2 porous nanoceramics
Authors: Xiong, Y
Liu, C
Taiwu, G
Bai, JL
Hu, YM
Li, YZ
Wang, Y 
Gu, HS
Chan, HLW 
Chen, WP
Keywords: Porous nanoceramics
Sensor response
Issue Date: 2016
Publisher: American Scientific Publishers
Source: Journal of nanoscience and nanotechnology, 2016, v. 16, no. 9, p. 9925-9929 How to cite?
Journal: Journal of nanoscience and nanotechnology 
Abstract: Pure and Au-doped TiO2ceramic bulks have been prepared from TiO2 nanoparticles through traditional pressing and sintering. For those samples sintered at 550 °C, nitrogen adsorption-desorption isotherms measured at 77 K revealed a highly porous microstructure with a Brunauer-Emmett-Teller (BET) specific surface area of 30 m2/g, which has also been confirmed through microscopic analyses. CO sensors have been further fabricated from those bulks through coating Pt electrodes on their surfaces. While sensors based-on undoped TiO2 nanoceramics show a sensitivity of 20 for 700 ppm CO in N2 at 300 °C, those based-on Au-doped TiO2 nanoceramics are able to show sensitivities as high as ∼104, highlighting the crucial role of Au-doping in elevating CO sensitivity. The mechanism for such ultrahigh sensitivities has been discussed, in which much attention has been paid to the absence of glass frit as commonly used in commercial thick-film gas sensors.
ISSN: 1533-4880 (print)
DOI: 10.1166/jnn.2016.12087
Appears in Collections:Journal/Magazine Article

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