Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 12    December 2016

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Ethanol sensing properties of Bi3.15Nd0.85Ti3O12 films at low operating temperatures
Hong JIANG1, Yong ZHANG2

1. Hunan Provincial Education Examination Board, Changsha 410006, China;
2. School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China

Abstract:Bi3.15Nd0.85Ti3O12 (BNdT) films were deposited on Pt/Ti/SiO2/Si(100) substrates by a metal organic decomposition (MOD) method, and annealed by a rapid thermal annealing process in oxygen atmosphere and in air, respectively. The crystalline structures and morphologies of BNdT films were characterized by X-ray diffraction and field-emission scanning electron microscopy, and the gas sensing properties were measured by monitoring its resistance at different gas concentrations. The results indicate that the BNdT films annealed in air are of porous microstructure and rough surface, and the annealing atmosphere has great influence on gas sensing properties. At an operating temperature of 100 °C, the BNdT films annealed in air are of high response value to 1×10-6 gaseous ethanol, and the detecting limit is as low as 0.1×10-6. The corresponding response and recovery time is about 10 and 6 s, respectively. The results can offer useful guidelines for fabricating high performance ethanol sensors.

 

Key words: BNdT film; ethanol sensing properties; metal organic decomposition; annealing atmosphere; low operating temperature

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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