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Sensors 2017, 17(12), 2931; https://doi.org/10.3390/s17122931

Single Interdigital Transducer Approach for Gravimetrical SAW Sensor Applications in Liquid Environments

1
Institute of Materials in Electrical Engineering 1, RWTH Aachen University, 52074 Aachen, Germany
2
Institute of Inorganic Chemistry and JARA-Fundamentals of Future Information Technologies, RWTH Aachen University, 52074 Aachen, Germany
*
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 9 December 2017 / Accepted: 12 December 2017 / Published: 17 December 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) devices are well known for mass-sensitive sensor applications. In biosensing applications, chemical and biochemically evoked binding processes on surfaces are detected in liquid environments using delay line or resonator sensor configurations, preferably in combination with the appropriate microfluidic devices. All configurations share the common feature of analyzing the transmission characteristic of the propagating SAW. In this paper, a novel SAW-based impedance sensor type is introduced which uses only one interdigital transducer (IDT), simultaneously as the SAW generator and the sensor element. Here, the input port reflection coefficient S11 is measured at the IDT instead of the commonly used S21 transmission forward gain parameter. Thus, a sharp and distinct peak of the S11 spectrum is obtained, enabling a comfortable direct readout of the sensor signal. Proof of the concept was gained by analyzing the specific binding of the 4-mercaptophenylacetic acid gold nanoparticles (MPA–AuNP) directly to the IDT surface. The corresponding binding kinetic of the MPA–AuNP on the functionalized gold surface has been analyzed and a sensitivity of 7.4 mΩ nM−1 has been determined. View Full-Text
Keywords: SAW; impedance sensor; mass sensitive; S11; gold nanoparticle SAW; impedance sensor; mass sensitive; S11; gold nanoparticle
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Nguyen, V.H.; Kaulen, C.; Simon, U.; Schnakenberg, U. Single Interdigital Transducer Approach for Gravimetrical SAW Sensor Applications in Liquid Environments. Sensors 2017, 17, 2931.

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