High-performance room-temperature formic acid vapor sensors based on multi-walled carbon nanotubes/polypyrrole composites

IF 4.1 Q1 CHEMISTRY, ANALYTICAL

Talanta Open Pub Date : 2025-02-06 DOI:10.1016/j.talo.2025.100419

Rapiphun Janmanee , Wasu Phanphaisarn , Saengrawee Sriwichai , Anurat Wisitsoraat , Chaikarn Liewhiran

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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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基于多壁碳纳米管/聚吡咯复合材料的高性能室温甲酸蒸气传感器

本研究采用原位氧化聚合法制备功能化多壁碳纳米管/聚吡咯（fMWCNTs/PPy）复合材料，制备室温甲酸（HCOOH）检测传感膜。通过x射线光谱、红外光谱、透射电镜和氮吸附分析对材料的性能进行了表征。研究结果证实，在不同MWCNTs负载水平下，嵌入在PPy纳米颗粒基体上的多壁纳米管形成了定义良好的多壁纳米管。从气敏测量结果来看，在PPy聚合过程中加入1% wt的fMWCNTs大大提高了传感器对1 vol% HCOOH的响应从2.6到~ 900，在25°C下对H2、CO2、CH4、C2H5OH、CH3OH和c3h60具有极好的选择性。功能化MWCNTs-PPy异质界面的分散对气敏性能的显著改善起着重要作用。因此，功能化mwcnts嵌入的基于pp的传感器将是室温下甲酸检测的一个有吸引力的选择，并且在医疗和环境应用中很有用。

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