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Sensors 2017, 17(8), 1785; https://doi.org/10.3390/s17081785

A Practical Model of Quartz Crystal Microbalance in Actual Applications

School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
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Received: 22 June 2017 / Revised: 1 August 2017 / Accepted: 2 August 2017 / Published: 3 August 2017
(This article belongs to the Section Chemical Sensors)
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Abstract

A practical model of quartz crystal microbalance (QCM) is presented, which considers both the Gaussian distribution characteristic of mass sensitivity and the influence of electrodes on the mass sensitivity. The equivalent mass sensitivity of 5 MHz and 10 MHz AT-cut QCMs with different sized electrodes were calculated according to this practical model. The equivalent mass sensitivity of this practical model is different from the Sauerbrey’s mass sensitivity, and the error between them increases sharply as the electrode radius decreases. A series of experiments which plate rigid gold film onto QCMs were carried out and the experimental results proved this practical model is more valid and correct rather than the classical Sauerbrey equation. The practical model based on the equivalent mass sensitivity is convenient and accurate in actual measurements. View Full-Text
Keywords: quartz crystal microbalance (QCM); mass sensitivity function; equivalent mass sensitivity quartz crystal microbalance (QCM); mass sensitivity function; equivalent mass sensitivity
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Huang, X.; Bai, Q.; Hu, J.; Hou, D. A Practical Model of Quartz Crystal Microbalance in Actual Applications. Sensors 2017, 17, 1785.

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