High-performance p-hexafluoroisopropanol phenyl functionalized multi-walled carbon nanotube film on surface acoustic wave device for organophosphorus vapor detection

Qiang Wu; Xue Li; Xuming Wang; Yubin Yuan; Xiangrui Bu; Haiyang Wu; Xin Li; Chuanyu Han; XiaoLi Wang; Weihua Liu

doi:10.1088/1361-6528/ac7242

High-performance p-hexafluoroisopropanol phenyl functionalized multi-walled carbon nanotube film on surface acoustic wave device for organophosphorus vapor detection

Nanotechnology. 2022 Jun 20;33(37). doi: 10.1088/1361-6528/ac7242.

Authors

Qiang Wu^{1

2}, Xue Li^{1

2}, Xuming Wang^{1

2}, Yubin Yuan^{1

2}, Xiangrui Bu^{1

2}, Haiyang Wu^{1

2}, Xin Li^{1

2}, Chuanyu Han^{1

2}, XiaoLi Wang^{1

2

3}, Weihua Liu^{1

2

4}

Affiliations

¹ Department of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.
² The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, People's Republic of China.
³ School of Science, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.
⁴ Research Institute of Xi'an Jiaotong University, Zhejiang, 311215, People's Republic of China.

PMID: 35605577
DOI: 10.1088/1361-6528/ac7242

Abstract

A delay line-type surface acoustic wave (SAW) gas sensor based on p-hexafluoroisopropanol phenyl (HFIPPH) functionalized multi-walled carbon nanotube (MWCNT) film is developed to detect organophosphorus dimethyl methylphosphonate (DMMP) vapor (a simulant of chemical nerve agent sarin). Inspired by the transfer process of Cu-based graphene, a uniform and size-controllable HFIPPH-MWCNT film is successfully prepared on the SAW device via a wet-etching transfer method. For the first time, we use the method of measuring the change of the sensor's insertion loss to achieve the detection of ultra-low concentration DMMP vapor. The designed sensor exhibits a fast response/recovery time about 3 s/50 s, and a low detection limit of 0.1 ppm. Additionally, the stability and selectivity of the sensor and the influence of humidity on its response are evaluated through experiments. The acoustoelectric effect is proved to be the sensing mechanism of the sensor insertion loss response.

Keywords: DMMP; SAW; acoustoelectric effect; functionalized carbon nanotubes; gas sensor; self-supporting film.