{"title":"Parts-per-Trillion-Level Acetone Gas Detection Using a Suspended Graphene/SiO<sub>2</sub> SAW Breath and Skin Gas Sensor: Simulation and Experimental Study.","authors":"Haolong Zhou, Sankar Ganesh Ramaraj, Md Shamim Sarker, Siyi Tang, Hiroyasu Yamahara, Hitoshi Tabata","doi":"10.1021/acssensors.4c02344","DOIUrl":null,"url":null,"abstract":"<p><p>Detection of parts-per-trillion (ppt)-level acetone gas molecules at room temperature using suspended graphene on SiO<sub>2</sub> micropillars has rarely been achieved using solid-state devices or surface acoustic wave (SAW) sensors. This paper presents the effect of SiO<sub>2</sub> micropillars and suspended graphene as a guiding and sensing layer to detect acetone gas. The integration of suspended graphene with SiO<sub>2</sub> micropillars introduces a coupled resonance effect arising from the interaction between the mechanical vibrations of the graphene and the acoustic vibrations of the micropillars. This effect leads to the formation of hybrid resonance modes when the natural frequencies of the vibrations align. This coupling mechanism amplifies the displacement and energy of the Love wave propagating along the surface of the sensor, enhancing its overall performance. Additionally, the interaction of the Love waves with the SiO<sub>2</sub> micropillars and the suspended graphene generates characteristic dips in the transmission spectra. These dips correspond to the excitation of specific flexural and torsional resonance modes within the structure. A custom-fabricated SAW device, featuring micropillars with a diameter of 4 μm and heights of 1.0 and 1.2 μm, demonstrated exceptionally high sensitivity toward acetone gas at a concentration of 500 ppt. Moreover, the suspended graphene exhibited rapid response and recovery times across a wide range of acetone concentrations.</p>","PeriodicalId":24,"journal":{"name":"ACS Sensors","volume":" ","pages":""},"PeriodicalIF":8.2000,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Sensors","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acssensors.4c02344","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Detection of parts-per-trillion (ppt)-level acetone gas molecules at room temperature using suspended graphene on SiO2 micropillars has rarely been achieved using solid-state devices or surface acoustic wave (SAW) sensors. This paper presents the effect of SiO2 micropillars and suspended graphene as a guiding and sensing layer to detect acetone gas. The integration of suspended graphene with SiO2 micropillars introduces a coupled resonance effect arising from the interaction between the mechanical vibrations of the graphene and the acoustic vibrations of the micropillars. This effect leads to the formation of hybrid resonance modes when the natural frequencies of the vibrations align. This coupling mechanism amplifies the displacement and energy of the Love wave propagating along the surface of the sensor, enhancing its overall performance. Additionally, the interaction of the Love waves with the SiO2 micropillars and the suspended graphene generates characteristic dips in the transmission spectra. These dips correspond to the excitation of specific flexural and torsional resonance modes within the structure. A custom-fabricated SAW device, featuring micropillars with a diameter of 4 μm and heights of 1.0 and 1.2 μm, demonstrated exceptionally high sensitivity toward acetone gas at a concentration of 500 ppt. Moreover, the suspended graphene exhibited rapid response and recovery times across a wide range of acetone concentrations.
期刊介绍：
ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.
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