journal article·2023-04-05

Field Effect Transistor Gas Sensors Based on Mechanically Exfoliated Van der Waals Materials

Yue Zhao, Gang Wu, Kuan-Ming Hung, Jiung Cho, Miri Choi, Cormac Ó Coileáin, Georg S. Duesberg, Xiang-Kui Ren, Ching-Ray Chang, Han-Chun Wu

ACS Applied Materials & Interfaces· Volume 15· Issue 13
Publisher page

Abstract

The high surface-to-volume ratio and flatness of mechanically exfoliated van der Waals (vdW) layered materials make them an ideal platform to investigate the Langmuir absorption model. In this work, we fabricated field effect transistor gas sensors, based on a variety of mechanically exfoliated vdW materials, and investigated their electrical field-dependent gas sensing properties. The good agreement between the experimentally extracted intrinsic parameters, such as equilibrium constant and adsorption energy, and theoretically predicted values suggests validity of the Langmuir absorption model for vdW materials. Moreover, we show that the device sensing behavior depends crucially on the availability of carriers, and giant sensitivities and strong selectivity can be achieved at the sensitivity singularity. Finally, we demonstrate that such features provide a fingerprint for different gases to quickly detect and differentiate between low concentrations of mixed hazardous gases using sensor arrays.
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Research context

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Graphene research and applications · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physics, Beijing Institute of Technology, Beijing 100081, P. R. China

Department of Electronics Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan 807, ROC

Western Seoul Center, Korea Basic Science Institute, Seoul 03579, Republic of Korea

Chuncheon Center, Korea Basic Science Institute, Chuncheon 24341, Republic of Korea

Institute of Physics, Faculty of Electrical Engineering and Information Technology (EIT 2) and Center for Integrated Sensor Systems, University of the Bundeswehr Munich, Neubiberg 85577, Germany

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China

Quantum Information Center, Chung Yuan Christian University, Taoyuan, Taiwan 32023, ROC

Department of Physics, National Taiwan University, Taipei, Taiwan 106, ROC

Funding

Bundesministerium f??r Bildung und Forschung · Beijing Institute of Technology · National Natural Science Foundation of China · European Union

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