Real-time detection of acetone gas molecules at ppt levels in an air atmosphere using a partially suspended graphene surface acoustic wave skin gas sensor

Haolong Zhou; Sankar Ganesh Ramaraj; Kaijie Ma; Md Shamim Sarker; Zhiqiang Liao; Siyi Tang; Hiroyasu Yamahara; Hitoshi Tabata

doi:10.1039/D3NA00914A

Real-time detection of acetone gas molecules at ppt levels in an air atmosphere using a partially suspended graphene surface acoustic wave skin gas sensor†

Haolong Zhou,^a Sankar Ganesh Ramaraj,

*^ab Kaijie Ma,^b Md Shamim Sarker,^a Zhiqiang Liao,^a Siyi Tang,^a Hiroyasu Yamahara*^a and Hitoshi Tabata*^ab

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* Corresponding authors

^a Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
E-mail: tabata@g.ecc.u-tokyo.ac.jp, yamahara@bioxide.t.u-tokyo.ac.jp, ramaraj@g.ecc.u-tokyo.ac.jp

^b Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan

Abstract

To improve the quality of modern life in the current society, low-power, highly sensitive, and reliable healthcare technology is necessary to monitor human health in real-time. In this study, we fabricated partially suspended monolayer graphene surface acoustic wave gas sensors (G-SAWs) with a love-mode wave to effectively detect ppt-level acetone gas molecules at room temperature. The sputtered SiO₂ thin film on the surface of a black 36°YX-LiTaO₃ (B-LT) substrate acted as a guiding layer, effectively reducing the noise and insertion loss. The G-SAWs exhibited enhanced gas response towards acetone gas molecules (800 ppt) in a real-time atmosphere. The high sensitivity of the G-SAW sensor can be attributed to the elasticity and surface roughness of the SiO₂ film. In addition, the G-SAW sensor exhibited rapid response and recovery at room temperature. This study provides a potential strategy for diagnosing different stages of diabetes in the human body.

This article is part of the themed collection: Popular Advances

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DOI: https://doi.org/10.1039/D3NA00914A
Article type: Paper
Submitted: 23 Oct 2023
Accepted: 31 Oct 2023
First published: 17 Nov 2023
This article is Open Access

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Nanoscale Adv., 2023,5, 6999-7008

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Real-time detection of acetone gas molecules at ppt levels in an air atmosphere using a partially suspended graphene surface acoustic wave skin gas sensor

H. Zhou, S. G. Ramaraj, K. Ma, M. S. Sarker, Z. Liao, S. Tang, H. Yamahara and H. Tabata, Nanoscale Adv., 2023, 5, 6999 DOI: 10.1039/D3NA00914A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Nanoscale Advances

Real-time detection of acetone gas molecules at ppt levels in an air atmosphere using a partially suspended graphene surface acoustic wave skin gas sensor†

Abstract

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Real-time detection of acetone gas molecules at ppt levels in an air atmosphere using a partially suspended graphene surface acoustic wave skin gas sensor

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