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Sensors 2017, 17(12), 2716; https://doi.org/10.3390/s17122716

Surface Acoustic Wave (SAW) for Chemical Sensing Applications of Recognition Layers

1
Department of Analytical Chemistry, University of Vienna, Währinger Straße 38, A-1090 Vienna, Austria
2
Institute of Chemistry, University of the Punjab, Quaid-i-Azam Campus, Lahore 54590, Pakistan
Dedicated to Prof. Dr. Robert Pirker on the occasion of his 65th birthday.
*
Author to whom correspondence should be addressed.
Received: 27 September 2017 / Accepted: 20 November 2017 / Published: 24 November 2017
(This article belongs to the Special Issue Surface Acoustic Wave and Bulk Acoustic Wave Sensors)
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Abstract

Surface acoustic wave (SAW) resonators represent some of the most prominent acoustic devices for chemical sensing applications. As their frequency ranges from several hundred MHz to GHz, therefore they can record remarkably diminutive frequency shifts resulting from exceptionally small mass loadings. Their miniaturized design, high thermal stability and possibility of wireless integration make these devices highly competitive. Owing to these special characteristics, they are widely accepted as smart transducers that can be combined with a variety of recognition layers based on host-guest interactions, metal oxide coatings, carbon nanotubes, graphene sheets, functional polymers and biological receptors. As a result of this, there is a broad spectrum of SAW sensors, i.e., having sensing applications ranging from small gas molecules to large bio-analytes or even whole cell structures. This review shall cover from the fundamentals to modern design developments in SAW devices with respect to interfacial receptor coatings for exemplary sensor applications. The related problems and their possible solutions shall also be covered, with a focus on emerging trends and future opportunities for making SAW as established sensing technology. View Full-Text
Keywords: surface acoustic wave (SAW); shear-horizontal surface acoustic wave (SH-SAW); shear transverse wave (STW); RFID-tags; piezoelectric; chemical sensors; recognition layers surface acoustic wave (SAW); shear-horizontal surface acoustic wave (SH-SAW); shear transverse wave (STW); RFID-tags; piezoelectric; chemical sensors; recognition layers
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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 (CC BY 4.0).
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Mujahid, A.; Dickert, F.L. Surface Acoustic Wave (SAW) for Chemical Sensing Applications of Recognition Layers. Sensors 2017, 17, 2716.

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