Humidity sensing properties of bismuth phosphates

Min Sheng, Leilei Gu, Roman Kontic, Ying Zhou, Kaibo Zheng, Guorong Chen, Xiaoliang Mo, Greta R. Patzke

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)642-649
JournalSensors and Actuators B: Chemical
Volume166
DOIs
Publication statusPublished - 2012

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Chemical Physics (S) (011001060)

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Free keywords

  • Humidity sensors
  • Bismuth phosphate
  • Sillenite type
  • Hydrothermal
  • synthesis

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