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Chin. Phys. B, 2014, Vol. 23(1): 017804    DOI: 10.1088/1674-1056/23/1/017804

Vibration analysis of a new polymer quartz piezoelectric crystal sensor for detecting characteristic materials of volatility liquid

Gu Yu (谷宇), Li Qiang (李强), Xu Bao-Jun (许保军), Zhao Zhe (赵喆)
Department of Mechanics, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
Abstract  We present a new polymer quartz piezoelectric crystal sensor that takes a quartz piezoelectric crystal as the basal material and a nanometer nonmetallic polymer thin film as the surface coating based on the principle of quartz crystal microbalance (QCM). The new sensor can be used to detect the characteristic materials of a volatile liquid. A mechanical model of the new sensor was built, whose structure was a thin circle plate composing of polytef/quartz piezoelectric/polytef. The mechanical model had a diameter of 8 mm and a thickness of 170 μm. The vibration state of the model was simulated by software ANSYS after the physical parameters and the boundary condition of the new sensor were set. According to the results of experiments, we set up a frequency range from 9.995850 MHz to 9.997225 MHz, 17 kinds of frequencies and modes of vibration were obtained within this range. We found a special frequency fsp of 9.996358 MHz. When the resonant frequency of the new sensor’s mechanical model reached the special frequency, a special phenomenon occurred. In this case, the amplitude of the center point O on the mechanical model reached the maximum value. At the same time, the minimum absolute difference between the simulated frequency based on the ANSYS software and the experimental measured stable frequency was reached. The research showed that the design of the new polymer quartz piezoelectric crystal sensor perfectly conforms to the principle of QCM. A special frequency value fsp was found and subsequently became one of the most important parameters in the new sensor design.
Keywords:  quartz piezoelectric crystal sensor      quartz crystal microbalance      vibration analysis      special resonator frequency  
Received:  28 August 2013      Revised:  23 September 2013      Accepted manuscript online: 
PACS:  78.20.Bh (Theory, models, and numerical simulation)  
  68.43.-h (Chemisorption/physisorption: adsorbates on surfaces)  
  07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)  
Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2013AA030901).
Corresponding Authors:  Gu Yu     E-mail:

Cite this article: 

Gu Yu (谷宇), Li Qiang (李强), Xu Bao-Jun (许保军), Zhao Zhe (赵喆) Vibration analysis of a new polymer quartz piezoelectric crystal sensor for detecting characteristic materials of volatility liquid 2014 Chin. Phys. B 23 017804

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