Journal
NANOTECHNOLOGY
Volume 33, Issue 37, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac7242
Keywords
SAW; gas sensor; functionalized carbon nanotubes; self-supporting film; acoustoelectric effect; DMMP
Funding
- National Natural Science Foundation of China [61671368]
- Zhejiang Provincial Natural Science Foundation of China [LGG19F040002]
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A delay line-type SAW gas sensor based on HFIPPH functionalized MWCNT film is developed to detect DMMP vapor. The sensor exhibits fast response/recovery time and low detection limit, and the acoustoelectric effect is proved to be the sensing mechanism.
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.
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