{"title":"High-performance room-temperature formic acid vapor sensors based on multi-walled carbon nanotubes/polypyrrole composites","authors":"Rapiphun Janmanee , Wasu Phanphaisarn , Saengrawee Sriwichai , Anurat Wisitsoraat , Chaikarn Liewhiran","doi":"10.1016/j.talo.2025.100419","DOIUrl":null,"url":null,"abstract":"<div><div>In this research, functionalized multi-walled carbon nanotubes/polypyrrole (fMWCNTs/PPy) composites were synthesized by <em>in-situ</em> oxidative polymerization approach to fabricate sensing films for room-temperature formic acid (HCOOH) detection. The material properties were characterized by X-ray spectroscopy, infrared spectroscopy, transmission electron microscopy, and nitrogen adsorption analysis. The study results confirmed the formation of well-defined multiwalled nanotubes embedded on PPy nanoparticulate matrix with varying MWCNTs loading levels. From gas-sensing measurement results, the addition of 1 %wt fMWCNTs during PPy polymerization greatly enhanced the sensor response from 2.6 to ∼900 towards 1 vol% HCOOH with excellent selectivity against H<sub>2</sub>, CO<sub>2</sub>, CH<sub>4</sub>, C<sub>2</sub>H<sub>5</sub>OH, CH<sub>3</sub>OH, and C<sub>3</sub>H<sub>6</sub>O at 25 °C. The dispersion of functionalized MWCNTs-PPy heterointerfaces could play an important role in the significant improvement of gas-sensing properties. Therefore, the functionalized MWCNTs-embedded PPy-based sensor would be an attractive choice for formic acid detection at room temperature and useful in medical and environmental applications.</div></div>","PeriodicalId":436,"journal":{"name":"Talanta Open","volume":"11 ","pages":"Article 100419"},"PeriodicalIF":3.7000,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Talanta Open","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666831925000220","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/2/6 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
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Abstract
In this research, functionalized multi-walled carbon nanotubes/polypyrrole (fMWCNTs/PPy) composites were synthesized by in-situ oxidative polymerization approach to fabricate sensing films for room-temperature formic acid (HCOOH) detection. The material properties were characterized by X-ray spectroscopy, infrared spectroscopy, transmission electron microscopy, and nitrogen adsorption analysis. The study results confirmed the formation of well-defined multiwalled nanotubes embedded on PPy nanoparticulate matrix with varying MWCNTs loading levels. From gas-sensing measurement results, the addition of 1 %wt fMWCNTs during PPy polymerization greatly enhanced the sensor response from 2.6 to ∼900 towards 1 vol% HCOOH with excellent selectivity against H2, CO2, CH4, C2H5OH, CH3OH, and C3H6O at 25 °C. The dispersion of functionalized MWCNTs-PPy heterointerfaces could play an important role in the significant improvement of gas-sensing properties. Therefore, the functionalized MWCNTs-embedded PPy-based sensor would be an attractive choice for formic acid detection at room temperature and useful in medical and environmental applications.
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