Bimorph material/structure designs for high sensitivity flexible surface acoustic wave temperature sensors

Ran Tao, Sameer Ahmad Hasan, Hong Zhe Wang, Jian Zhou, Jing Ting Luo, Glen McHale, Des Gibson, Pep Canyelles-Pericas, Michael D Cooke, David Wood, Yang Liu, Qiang Wu, Wai Pang Ng, Thomas Franke, Richard Fu

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18 Citations (Scopus)
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Abstract

A fundamental challenge for surface acoustic wave (SAW) temperature sensors is the detection of small temperature changes on non-planar, often curved, surfaces. In this work, we present a new design methodology for SAW devices based on flexible substrate and bimorph material/structures, which can maximize the temperature coefficient of frequency (TCF). We performed finite element analysis simulations and obtained theoretical TCF values for SAW sensors made of ZnO thin films (~5 μm thick) coated aluminum (Al) foil and Al plate substrates with thicknesses varied from 1 to 1600 μm. Based on the simulation results, SAW devices with selected Al foil or plate thicknesses were fabricated. The experimentally measured TCF values were in excellent agreements with the simulation results. A normalized wavelength parameter (e.g., the ratio between wavelength and sample thickness, λ⁄h) was applied to successfully describe changes in the TCF values, and the TCF readings of the ZnO/Al SAW devices showed dramatic increases when the normalized wavelength λ⁄h was larger than 1. Using this design approach, we obtained the highest reported TCF value of -760 ppm/K for a SAW device made of ZnO thin film coated on Al foils (50 μm thick), thereby enabling low cost temperature sensor applications to be realized on flexible substrates.
Original languageEnglish
Article number9052
Number of pages9
JournalScientific Reports
Volume8
Early online date13 Jun 2018
DOIs
Publication statusPublished - Dec 2018

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