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Abstract <p>Recent advancements in carbon nanotubes (CNTs) have demonstrated their gas sensing properties due to&#xa0;their high surface area&#xa0;and electrical conductivity. This study analyzes&#xa0;single-walled and multi-walled CNTs (SWCNTs and MWCNTs) as chemiresistors with a focus on detecting volatile organic compounds (VOCs) and comparing their performance with a commercial metal-oxide gas sensor. CNT sensors were fabricated by drop-casting CNT ink between two electrodes and exposed to VOCs in an enclosed chamber. While both sensors showed resistance variations when exposed to VOCs, the SWCNT resistance did not change after stopping the exposure, implying a slow desorption process. In contrast, the MWCNT’s response matched the response from the commercial sensor that was used as a reference. The data from the MWCNT sensor showed the highest sensitivity to&#xa0;ethanol (1.56%/ppm) with the ability to detect acetone and isopropanol at a sub-ppm level.&#xa0;The data show the feasibility of using CNT as a low-cost alternative to commercial sensors.</p> Graphical Abstract <p></p>

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Single-walled and multi-walled carbon nanotube sensors for volatile organic compound (VOC) detection

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Thomas Kalach,
  • Nida Khattak,
  • Arash Takshi

摘要

Abstract

Recent advancements in carbon nanotubes (CNTs) have demonstrated their gas sensing properties due to their high surface area and electrical conductivity. This study analyzes single-walled and multi-walled CNTs (SWCNTs and MWCNTs) as chemiresistors with a focus on detecting volatile organic compounds (VOCs) and comparing their performance with a commercial metal-oxide gas sensor. CNT sensors were fabricated by drop-casting CNT ink between two electrodes and exposed to VOCs in an enclosed chamber. While both sensors showed resistance variations when exposed to VOCs, the SWCNT resistance did not change after stopping the exposure, implying a slow desorption process. In contrast, the MWCNT’s response matched the response from the commercial sensor that was used as a reference. The data from the MWCNT sensor showed the highest sensitivity to ethanol (1.56%/ppm) with the ability to detect acetone and isopropanol at a sub-ppm level. The data show the feasibility of using CNT as a low-cost alternative to commercial sensors.

Graphical Abstract