Semiconductor Physics, Quantum Electronics & Optoelectronics, 21 (3), P. 307-314 (2018).

The role of shear modulus and viscosity of thin organic films on the adsorption response of QCM sensors
Z.I. Kazantseva1, I.A. Koshets1,*, Yu.M. Shirshov1, V.I. Kalchenko2

1Institute of Semiconductor Physics, NAS of Ukraine, 41, prospect Nauky, 03680 Kyiv, Ukraine 2Institute of Organic Chemistry, NAS of Ukraine, 5, Murmanska str., 02660 Kyiv, Ukraine

Abstract. This work reports on the results of numerical calculations of quartz microbalance (QCM) sensors response under adsorption of analyte molecules. The influence of share modulus and viscosity has been studied. It was shown that even in the case of sufficiently thin films (hundreds of nanometers), the viscosity effects can significantly affect the sensor response during adsorption. In the case of sufficiently thick layers, the viscosity effects can turn out to radically change the response of QCM to the adsorption of volatile molecules. Thus, utilizing QCM-based sensors in viscous medium it is necessary to take into account not only mass loaded (adsorbed) onto quartz surface but also effect of viscosity on sensor response.

Keywords: QCM sensor, polymer coating, viscosity, adsorption.

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