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<p>This study presents the development of a high-performance ZnO thin-film gas sensor via a facile dip-coating method for triethylamine (TEA) detection. The sensor was fabricated by depositing sol–gel-derived ZnO films on gold electrodes with varying dip-coating cycles. Structural characterization revealed that the 10-cycle sample possessed optimal film density with minimal cracking, and featured a porous morphology composed of nanoparticles with sizes ranging from 20 to 30&#xa0;nm. Gas-sensing tests demonstrated this sample achieved superior sensitivity (response ~ 40 to 50 ppm TEA at 350&#xa0;°C), fast response/recovery times (11 s/16 s), and a ultralow minimum detection concentration (1 ppm). It exhibited a broad detection range, remarkable selectivity for TEA, excellent humidity resistance, and outstanding long-term stability. This study highlights the dip-coating method as a scalable approach for producing high-quality ZnO sensors with industrial potential.</p>

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ZnO thin-film gas sensor fabricated by dip-coating method for triethylamine detection

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Kai Du,
  • Weiqiang Jiang,
  • Minghao Zhou,
  • Lanlan He,
  • Gaojie Li

摘要

This study presents the development of a high-performance ZnO thin-film gas sensor via a facile dip-coating method for triethylamine (TEA) detection. The sensor was fabricated by depositing sol–gel-derived ZnO films on gold electrodes with varying dip-coating cycles. Structural characterization revealed that the 10-cycle sample possessed optimal film density with minimal cracking, and featured a porous morphology composed of nanoparticles with sizes ranging from 20 to 30 nm. Gas-sensing tests demonstrated this sample achieved superior sensitivity (response ~ 40 to 50 ppm TEA at 350 °C), fast response/recovery times (11 s/16 s), and a ultralow minimum detection concentration (1 ppm). It exhibited a broad detection range, remarkable selectivity for TEA, excellent humidity resistance, and outstanding long-term stability. This study highlights the dip-coating method as a scalable approach for producing high-quality ZnO sensors with industrial potential.