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<p>CuO nanoparticles were biosynthesized via an eco-friendly plant-mediated route, as confirmed by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) analyses, and were employed as chemo-resistive sensors for volatile organic compounds (VOCs). The sensor exhibited a pronounced response to ethanol vapor, with sensitivity increasing from 421 to 3000% for ethanol concentrations ranging from 10 to 100 ppm at an optimal operating temperature of 240 °C. Characteristic p-type semiconductor behavior was observed, with sensor resistance increasing upon ethanol exposure. Cross-sensitivity tests showed responses of 571%, 400%, and 30% for 30 ppm of ethanol, acetone, and benzene, respectively. Monte Carlo simulations supported the adsorption affinity order of ethanol &gt; acetone &gt; &gt; benzene on the CuO surface, which was attributed to stronger hydrogen bonding and surface interactions with ethanol molecules. The biosynthesized CuO sensor outperformed comparable materials in ethanol sensitivity while employing a greener synthesis method. Response and recovery times ranged from 4 to 8 min, with the prolonged recovery attributed to diffusion-limited desorption processes. These results highlight the potential of biosynthesized CuO nanoparticles as highly sensitive and selective ethanol gas sensors.</p>

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Eco-friendly synthesis of CuO nanoparticles for VOC sensing: experimental and theoretical insights

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Omar Boualiouaat,
  • Brahim Bouargane,
  • Brahim El Ibrahimi,
  • Abderrahman Aajmi,
  • Houda Lahlou,
  • Murat Yilmaz,
  • Mohamed El Housse,
  • Abdelaziz Ait Addi

摘要

CuO nanoparticles were biosynthesized via an eco-friendly plant-mediated route, as confirmed by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) analyses, and were employed as chemo-resistive sensors for volatile organic compounds (VOCs). The sensor exhibited a pronounced response to ethanol vapor, with sensitivity increasing from 421 to 3000% for ethanol concentrations ranging from 10 to 100 ppm at an optimal operating temperature of 240 °C. Characteristic p-type semiconductor behavior was observed, with sensor resistance increasing upon ethanol exposure. Cross-sensitivity tests showed responses of 571%, 400%, and 30% for 30 ppm of ethanol, acetone, and benzene, respectively. Monte Carlo simulations supported the adsorption affinity order of ethanol > acetone > > benzene on the CuO surface, which was attributed to stronger hydrogen bonding and surface interactions with ethanol molecules. The biosynthesized CuO sensor outperformed comparable materials in ethanol sensitivity while employing a greener synthesis method. Response and recovery times ranged from 4 to 8 min, with the prolonged recovery attributed to diffusion-limited desorption processes. These results highlight the potential of biosynthesized CuO nanoparticles as highly sensitive and selective ethanol gas sensors.