Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61650
Title: Gas sensing capabilities of TiO2 porous nanoceramics prepared through premature sintering
Authors: Xiong, Y
Tang, Z
Wang, Y 
Hu, Y
Gu, H
Li, Y
Chan, HLW 
Chen, W
Keywords: CO
Hydrogen
Porous nanoceramics
Premature sintering
Sensors
TiO2
Issue Date: 2015
Publisher: SpringerOpen
Source: Journal of advanced ceramics, 2015, v. 4, no. 2, p. 152-157 How to cite?
Journal: Journal of advanced ceramics 
Abstract: Pure and noble metal (Pt, Pd, and Au) doped TiO2 nanoceramics have been prepared from TiO2 nanoparticles through traditional pressing and sintering. For those samples sintered at 550 °C, a typical premature sintering occurred, which led to the formation of a highly porous microstructure with a Brunauer-Emmett-Teller (BET) specific surface area of 23 m2/g. At room temperature, only Pt-doped samples showed obvious response to hydrogen, with sensitivities as high as ∼500 for 1000 ppm H2 in N2; at 300 °C, all samples showed obvious responses to CO, while the responses of noble metal doped samples were much higher than that of the undoped ones. The mechanism for the observed sensing capabilities has been discussed, in which the catalytic effect of Pt for hydrogen is believed responsible for the room-temperature hydrogen sensing capabilities, and the absence of glass frit as commonly used in commercial thick-film metal oxide gas sensors is related to the high sensitivities. It is proposed that much attention should be paid to metal oxide porous nanoceramics in developing gas sensors with high sensitivities and low working temperatures.
URI: http://hdl.handle.net/10397/61650
ISSN: 2226-4108 (print)
2227-8508 (online)
DOI: 10.1007/s40145-015-0148-y
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