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Humidity Sensor Based on Polymer Coated Quartz Crystal Microbalance (QCM)

[+] Author Affiliations
Zhihua Ying, Yadong Jiang, Guangzhong Xie, Xiaosong Du, Hua Wang, Junsheng Yu

University of Electronic Science and Technology of China, Chengdu, China

Paper No. MNC2007-21198, pp. 421-424; 4 pages
doi:10.1115/MNC2007-21198
From:
  • 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems
  • First International Conference on Integration and Commercialization of Micro and Nanosystems, Parts A and B
  • Sanya, Hainan, China, January 10–13, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4265-7 | eISBN: 0-7918-3794-7
  • Copyright © 2007 by ASME

abstract

Humidity sensors featured by the combination of a quartz crystal microbalance (QCM) and polyvinylpyrrolidone (PVP) film were fabricated. PVP films were distributed onto the electrode surfaces of quartz crystal by drop-coating. The electrical characteristics of the devices as a function of relative humidity (RH %) measured in the airtight testing chamber to generate the controlled humidity were tested. The change in frequency of QCM with sensitive film was in situ monitored. Result shows when the polymer-coated QCM exposed to certain humidity circumstance, the change of mass on crystal sensitive surface results in the decrease of resonant frequency. It was found that the increase of shift frequency is proportional to the thickness of polymeric film. In low humidity range less than 50% RH, all of the sensors showed linear characteristics to humidity and mild frequency shift. In high humidity, the frequency shift changed dramatically.

Copyright © 2007 by ASME

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