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<p>Volatile organic compounds (VOCs) pose significant threats to both human health and the environment, contributing to respiratory diseases and ozone layer depletion. Therefore, the accurate detection of VOCs is of critical importance. However, conventional gas sensors typically rely on external detection devices and power sources, which constrain their applicability in certain environments. In this study, we propose a self-powered, flexible VOC sensor based on MXene, which has been demonstrated to exhibit piezoelectric properties. The device is capable of being actuated by motion, utilizing its piezoelectric output as both an intrinsic power source and a detection signal. When exposed to 200 ppm of ethanol, the sensor’s piezoelectric output voltage decreased from 4.34&#xa0;V to 1.78&#xa0;V under a constant strain, yielding a response of 58.99%, which is over 40 times higher than its intrinsic resistance-based response. Furthermore, the sensor exhibited rapid response and recovery times of 2.85&#xa0;s and 5.40&#xa0;s, respectively, for 200 ppm ethanol. These findings highlight the potential of integrating self-powered, flexible gas sensors into wearable electronic systems.</p>

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Monolayer Piezo-MXene for self-powered detection of volatile organic compounds

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Po Lin,
  • Li Sun,
  • Zhe Zhang,
  • Nan Sun,
  • Dongchen Tan,
  • Zhongming Wu,
  • Junfeng Lu

摘要

Volatile organic compounds (VOCs) pose significant threats to both human health and the environment, contributing to respiratory diseases and ozone layer depletion. Therefore, the accurate detection of VOCs is of critical importance. However, conventional gas sensors typically rely on external detection devices and power sources, which constrain their applicability in certain environments. In this study, we propose a self-powered, flexible VOC sensor based on MXene, which has been demonstrated to exhibit piezoelectric properties. The device is capable of being actuated by motion, utilizing its piezoelectric output as both an intrinsic power source and a detection signal. When exposed to 200 ppm of ethanol, the sensor’s piezoelectric output voltage decreased from 4.34 V to 1.78 V under a constant strain, yielding a response of 58.99%, which is over 40 times higher than its intrinsic resistance-based response. Furthermore, the sensor exhibited rapid response and recovery times of 2.85 s and 5.40 s, respectively, for 200 ppm ethanol. These findings highlight the potential of integrating self-powered, flexible gas sensors into wearable electronic systems.