Virtual sensor array based on MXene for selective detections of VOCs

Dongsheng Li, Guang Liu, Qian Zhang, Mengjiao Qu, Richard Fu, Qingjun Liu, Jin Xie

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Two-dimensional transition metal carbides/nitrides, known as MXenes, have recently received significant attention for gas sensing applications. However, MXenes have strong adsorption to many types of volatile organic compounds (VOCs), and therefore gas sensors based on MXenes generally have low selectivity and poor performance in mixtures of VOCs due to cross-sensitivity issues. Herein, we developed a Ti3C2Tx-based virtual sensor array (VSA) which allows both highly accurate detection and identification of different VOCs, as well as concentration prediction of the target VOC in variable backgrounds. The VSA’s responses from the broadband impedance spectra create a unique fingerprint of each VOC without a need for changing temperatures. Based on the methodologies of principal component analysis and linear discrimination analysis, we demonstrate highly accurate identifications for different types of VOCs and mixtures using this MXene based VSA. Furthermore, we demonstrate an accuracy of 93.2% for the prediction of ethanol concentrations in the presence of different concentrations of water and methanol. The high level of identification and concentration prediction shows a great potential of MXene based VSA for detection of VOCs of interest in the presence of known and unknown interferences.
Original languageEnglish
Article number129414
Number of pages9
JournalSensors and Actuators B: Chemical
Volume331
Early online date4 Jan 2021
DOIs
Publication statusPublished - 15 Mar 2021

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