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Sensors 2013, 13(2), 2164-2175; doi:10.3390/s130202164
Communication

Investigation into Mass Loading Sensitivity of Sezawa Wave Mode-Based Surface Acoustic Wave Sensors

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Received: 15 November 2012 / Revised: 5 January 2013 / Accepted: 21 January 2013 / Published: 6 February 2013
(This article belongs to the Special Issue Piezoelectric Sensors and Actuators)
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Abstract

In this work mass loading sensitivity of a Sezawa wave mode based surface acoustic wave (SAW) device is investigated through finite element method (FEM) simulation and the prospects of these devices to function as highly sensitive SAW sensors is reported. A ZnO/Si layered SAW resonator is considered for the simulation study. Initially the occurrence of Sezawa wave mode and displacement amplitude of the Rayleigh and Sezawa wave mode is studied for lower ZnO film thickness. Further, a thin film made of an arbitrary material is coated over the ZnO surface and the resonance frequency shift caused by mass loading of the film is estimated. It was observed that Sezawa wave mode shows significant sensitivity to change in mass loading and has higher sensitivity (eight times higher) than Rayleigh wave mode for the same device configuration. Further, the mass loading sensitivity was observed to be greater for a low ZnO film thickness to wavelength ratio. Accordingly, highly sensitive SAW sensors can be developed by coating a sensing medium over a layered SAW device and operating at Sezawa mode resonance frequency. The sensitivity can be increased by tuning the ZnO film thickness to wavelength ratio.
Keywords: surface acoustic wave devices; Sezawa wave mode; mass loading effect; sensors; FEM simulation surface acoustic wave devices; Sezawa wave mode; mass loading effect; sensors; FEM simulation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Mohanan, A.A.; Islam, M.S.; Ali, S.H.M.; Parthiban, R.; Ramakrishnan, N. Investigation into Mass Loading Sensitivity of Sezawa Wave Mode-Based Surface Acoustic Wave Sensors. Sensors 2013, 13, 2164-2175.

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