期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 166, 期 -, 页码 642-649出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.03.030
关键词
Humidity sensors; Bismuth phosphate; Sillenite type; Hydrothermal synthesis
资金
- Swiss National Science Foundation (SNSF) [PP00P2-133483/1]
- NCCR MaNEP (Materials with Novel Electronic Properties)
- Sino Swiss Science and Technology Cooperation (SSSTC) [EG16-032010]
- University of Zurich
- Shanghai Municipal Education Commission [11ZZ02]
- Scientific Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Electron Microscopy ETH Zurich, EMEZ
Cubic sillenite-type and monoclinic bismuth phosphates were synthesized via hydrothermal methods. Structure and morphology of cubic Bi13.1PO delta and monoclinic BiPO4 were characterized with a variety of analytical methods including powder X-ray diffraction, electron microscopy methods and surface area measurements. The humidity sensing properties of both bismuth phosphate types were investigated with respect to their capacitance characteristics. Sillenite-type cubic bismuth phosphate exhibits better response behavior than monoclinic BiPO4. Cubic bismuth phosphate displays a capacitance change of up to 4 orders of magnitude over a relative humidity (RH) range from 11% to 95% together with a linear adsorption/desorption relationship. This promising humidity sensing behavior is related to the presence of a framework structure containing polarizable Bi3+ cations in combination with moderate phosphate doping. (C) 2012 Elsevier B.V. All rights reserved.
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