Anisotropic sensing based on single ReS2flake for VOCs discrimination

Yuan Xie; Zhe Zhang; Fanying Meng; Shida Huo; Xiaodong Hu; Pingjuan Niu; Enxiu Wu

doi:10.1088/1361-6528/ad41da

Anisotropic sensing based on single ReS₂flake for VOCs discrimination

Nanotechnology. 2024 May 9;35(30). doi: 10.1088/1361-6528/ad41da.

Authors

Yuan Xie^{1

2}, Zhe Zhang², Fanying Meng², Shida Huo², Xiaodong Hu², Pingjuan Niu¹, Enxiu Wu^{2

3}

Affiliations

¹ School of Electronics and Information Engineering, Tiangong University, No. 399 BinShuiXi Road, Tianjin, 300387, People's Republic of China.
² State Key Laboratory of Precision Measurement Technology and Instruments, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, No. 92 Weijin Road, Tianjin, 300072, People's Republic of China.
³ State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem And Information Technology, No. 865 Changning Road, Shanghai, 200050, People's Republic of China.

PMID: 38651768
DOI: 10.1088/1361-6528/ad41da

Abstract

Selective and sensitive detection of volatile organic compounds (VOCs) holds paramount importance in real-world applications. This study proposes an innovative approach utilizing a single ReS₂field-effect transistor (FET) characterized by distinct in-plane anisotropy, specifically tailored for VOC recognition. The unique responses of ReS₂, endowed with robust in-plane anisotropic properties, demonstrate significant difference along thea-axis andb-axis directions when exposed to four kinds of VOCs: acetone, methanol, ethanol, and IPA. Remarkably, the responses of ReS₂were significantly magnified under ultraviolet (UV) illumination, particularly in the case of acetone, where the response amplified by 10-15 times and the detection limit decreasing from 70 to 4 ppm compared to the dark conditions. Exploiting the discernible variances in responses along thea-axis andb-axis under both UV and dark conditions, the data points of acetone, ethanol, methanol and IPA gases were clearly separated in the principal component space without any overlap through principal component analysis, indicating that the single ReS₂FET has a high ability to distinguish various gas species. The exploration of anisotropic sensing materials and light excitation strategies can be applied to a broad range of sensing platforms based on two-dimensional materials for practical applications.

Keywords: ReS2 gas sensor; UV illumination; VOCs; in-plane anisotropic.