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ACS Appl Mater Interfaces. 2016 Aug 24;8(33):21742-9. doi: 10.1021/acsami.6b02682. Epub 2016 Aug 11.

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

Author information

1
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University , Tianjin 300072, China.
2
College of Precision Instrument and Optoelectronics Engineering, Tianjin University , Tianjin 300072, China.

Abstract

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.

KEYWORDS:

electrical sensing; gas sensor; graphene; resonators; solidly mounted resonator (SMR)

PMID:
27455947
DOI:
10.1021/acsami.6b02682

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