文献类型：期刊文献

英文题名：Detection of formic acid and acetic acid gases by a QCM sensor coated with an acidified multi-walled carbon nanotube membrane

作者：Cai, Jingfang[1];Yan, Ying[1,2];Wang, Weiwei[1];Ma, Yuanyuan[1];Cai, Lankun[1];Wu, Laiming[3];Zhou, Hao[3]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai, Peoples R China;[2]Chinese Acad Sci, Inst Oceanol, Shandong Key Lab Corros Sci, Jinan, Shandong, Peoples R China;[3]Shanghai Museum, 1118 Wulong Rd, Shanghai 200050, Peoples R China

年份：2023

卷号：44

期号：6

起止页码：751

外文期刊名：ENVIRONMENTAL TECHNOLOGY

收录：;EI(收录号：20214211042213);WOS:【SCI-EXPANDED(收录号:WOS:000707820400001)】；

基金：This work was supported by the National Key Research and Development Program of China (2020YFC1522500) and Open Fund of Shandong Key Laboratory of Corrosion Science.

语种：英文

外文关键词：QCM; acidized-MMWCNTs; formic acid vapour; acetic acid vapour; gas sensor

摘要：In this paper, the acidified multi-walled carbon nanotubes (MWCNTs) film was coated on the quartz crystal microbalance (QCM) to prepare a high-performance sensor for the real-time detection of organic acid gases. The material characteristics of the thin films were analysed by field emission scanning electro microscopy (FESEM), Raman spectra and X-ray photoelectron spectroscopy (XPS). The organic acid vapours' sensing results indicated that acidized-MWCNTs thin film exhibited good frequency response, repeatability, reversibility and stability. There is a clear linear relationship between the frequency offset and the organic acid vapours with concentration below 5.0 ppm, and the detection limit of 0.77 and 0.73 ppm for formic and acetic acid vapours, respectively. The sensor shows the highest response to formic acid vapour than acetic acid vapour which may be ascribed to molecular polarity. Furthermore, a sensing mechanism model was introduced to understand the adsorption reaction between organic acid molecules and acidized-MWCNTs. This paper proves that acidized-MWCNTs is a potential and suitable material for organic acid vapour detection when combined with a QCM sensor.