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Antenna-Based Popup Vapor Sensor Guided by Controlled Compressive Buckling

Soltani, Shaghayegh, Hillier, Aaron, Holder, Simon J., Batchelor, John C. (2019) Antenna-Based Popup Vapor Sensor Guided by Controlled Compressive Buckling. IEEE Sensors Journal, . pp. 1-9. ISSN 1530-437X. E-ISSN 1558-1748. (doi:10.1109/JSEN.2019.2952827) (KAR id:78378)

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http://dx.doi/org/10.1109/JSEN.2019.2952827

Abstract

A novel highly stretchable gas sensor is reported that is based on popup antenna reconfiguration due to the strain induced by the swelling of a polydimethylsiloxane (PDMS) substrate when exposed to diethyl ether. When the swollen substrate is removed from the volatile solvent environment, the PDMS volume increase is reversed leading to compressive stress in an attached antenna transforming a 2D structure to a 3D structure through mechanically induced shaping. This provides a low cost and simple route to tune the antenna resonant frequency and gain in direct response to a chemical stimulus. Our proposed solvent sensor is able to measure 0 to 60% PDMS swelling corresponding to diethyl ether concentrations up to 1620 ppm via a resonant frequency shift from 4 to 2.4 GHz. A fatigue life study indicated 〖10〗^(3.5) life cycles which demonstrates the durability of these sensors to accommodate large strain and repeatability of the sensing process. Multiphysics Finite Element Method (FEM) modelling of the mechanical and RF simulations along with analytical results based on an equivalent circuit model were in good agreement with experimental data and demonstrate the potential of these structures as sensors.

Item Type: Article
DOI/Identification number: 10.1109/JSEN.2019.2952827
Projects: [UNSPECIFIED] Passively Powered Non-Invasive Human Body Sensing on Bio-Degradable Conformal Substrates
Uncontrolled keywords: Compressive stress, popup antenna, diethyl ether, vapor, PDMS, sensor
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK7800 Electronics
T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK7800 Electronics > TK7871.6 Antennas and waveguides
Divisions: Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: John Batchelor
Date Deposited: 07 Nov 2019 17:10 UTC
Last Modified: 07 Aug 2020 13:36 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/78378 (The current URI for this page, for reference purposes)
Holder, Simon J.: https://orcid.org/0000-0001-8977-9257
Batchelor, John C.: https://orcid.org/0000-0002-5139-5765
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