Chemiresistive and Gravimetric Dual-Mode Gas Sensor toward Target Recognition and Differentiation

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• 作者：Yan Chen ; Hao Zhang ; Zhihong Feng ; Hongxiang Zhang ; Rui Zhang ; Yuanyuan Yu ; Jin Tao ; Hongyuan Zhao ; Wenlan Guo ; Wei Pang ; Xuexin Duan ; Jing Liu ; Daihua Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 24, 2016
• 年：2016
• 卷：8
• 期：33
• 页码：21742-21749
• 全文大小：447K
• 年卷期：0
• ISSN：1944-8252

文摘

We demonstrate a dual-mode gas sensor for simultaneous and independent acquisition of electrical and mechanical signals from the same gas adsorption event. The device integrates a graphene field-effect transistor (FET) with a piezoelectric resonator in a seamless manner by leveraging multiple structural and functional synergies. Dual signals resulting from independent physical processes, i.e., mass attachment and charge transfer can reflect intrinsic properties of gas molecules and potentially enable target recognition and quantification at the same time. Fabrication of the device is based on standard Integrated Circuit (IC) foundry processes and fully compatible with system-on-a-chip (SoC) integration to achieve extremely small form factors. In addition, the ability of simultaneous measurements of mass adsorption and charge transfer guides us to a more precise understanding of the interactions between graphene and various gas molecules. Besides its practical functions, the device serves as an effective tool to quantitatively investigate the physical processes and sensing mechanisms for a large library of sensing materials and target analytes.