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Letter

A ppm Ethanol Sensor Based on Fabry–Perot Interferometric Surface Stress Transducer at Room Temperature

1
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
2
Japan Society for the Promotion of Science, Tokyo 102-0083, Japan
3
Electronics Inspired-Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(23), 6868; https://doi.org/10.3390/s20236868
Received: 21 October 2020 / Revised: 21 November 2020 / Accepted: 27 November 2020 / Published: 30 November 2020
(This article belongs to the Section Chemical Sensors)
Disease screening by exhaled breath diagnosis is less burdensome for patients, and various devices have been developed as promising diagnostic methods. We developed a microelectromechanical system (MEMS) optical interferometric surface stress sensor to detect volatile ethanol gas at room temperature (26~27 °C) with high sensitivity. A sub-micron air gap in the optical interferometric sensor reduces interference orders, leading to increased spectral response associated with nanomechanical deflection caused by ethanol adsorption. The sub-micron cavity was embedded in a substrate using a transfer technique of parylene-C nanosheet. The sensor with a 0.4 µm gap shows a linear stable reaction, with small standard deviations, even at low ethanol gas concentrations of 5–110 ppm and a reversible reaction to the gas concentration change. Furthermore, the possibility of detecting sub-ppm ethanol concentration by optimizing the diameter and thickness of the deformable membrane is suggested. Compared with conventional MEMS surface stress gas sensors, the proposed optical interferometric sensor demonstrated high-sensitivity gas detection with exceeding the detection limit by two orders of magnitude while reducing the sensing area. View Full-Text
Keywords: fabry–perot interference; microelectromechanical systems; surface stress sensor; optical interferometry; film transfer technique; volatile organic compounds; ethanol; chemical sensing fabry–perot interference; microelectromechanical systems; surface stress sensor; optical interferometry; film transfer technique; volatile organic compounds; ethanol; chemical sensing
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MDPI and ACS Style

Takahashi, T.; Choi, Y.-J.; Sawada, K.; Takahashi, K. A ppm Ethanol Sensor Based on Fabry–Perot Interferometric Surface Stress Transducer at Room Temperature. Sensors 2020, 20, 6868. https://doi.org/10.3390/s20236868

AMA Style

Takahashi T, Choi Y-J, Sawada K, Takahashi K. A ppm Ethanol Sensor Based on Fabry–Perot Interferometric Surface Stress Transducer at Room Temperature. Sensors. 2020; 20(23):6868. https://doi.org/10.3390/s20236868

Chicago/Turabian Style

Takahashi, Toshiaki, Yong-Joon Choi, Kazuaki Sawada, and Kazuhiro Takahashi. 2020. "A ppm Ethanol Sensor Based on Fabry–Perot Interferometric Surface Stress Transducer at Room Temperature" Sensors 20, no. 23: 6868. https://doi.org/10.3390/s20236868

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