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<p>N-pentylamine is a toxic, harmful, and flammable volatile organic compound (VOC), and its real-time and effective detection is essential to ensure production and life safety. Nevertheless, there have been few reports on the detection of n-pentylamine gas to date. Herein, two MoO<sub>3</sub> materials with different crystal facets orientations were successfully synthesized via a facile solvothermal method and strategic modulation of reaction solvents. At an operating temperature of 150&#xa0;°C, the MoO<sub>3</sub> sensor with (040) crystal plane growth orientation exhibited an excellent response value of 212 and an extremely short response time (0.8&#xa0;s) to 50&#xa0;ppm n-pentylamine, which is about 3 times better than the MoO<sub>3</sub> sensor with (021) crystal plane growth orientation. Additionally, the sensors show superior linearity, reproducibility, and humidity resistance. The gas adsorption mechanisms on the material surfaces were elucidated through in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) characterization technique, XPS characterization analysis, and density functional theory (DFT) theoretical calculations. The results indicate that the exposed (040) crystal facets in MoO<sub>3</sub> show a superior adsorption affinity for n-pentylamine. This research further broadens the potential applications of gas sensors that detect volatile organic compounds.</p> Graphical abstract <p></p>

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Enhancement of n-pentylamine gas sensing performance through regulating the crystal facet orientation of MoO3

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Rui Li,
  • Jing Tang,
  • Qiuyue Zheng,
  • Xianfa Zhang,
  • Xin Dong,
  • Lihua Huo,
  • Yingming Xu,
  • Xiaoli Cheng

摘要

N-pentylamine is a toxic, harmful, and flammable volatile organic compound (VOC), and its real-time and effective detection is essential to ensure production and life safety. Nevertheless, there have been few reports on the detection of n-pentylamine gas to date. Herein, two MoO3 materials with different crystal facets orientations were successfully synthesized via a facile solvothermal method and strategic modulation of reaction solvents. At an operating temperature of 150 °C, the MoO3 sensor with (040) crystal plane growth orientation exhibited an excellent response value of 212 and an extremely short response time (0.8 s) to 50 ppm n-pentylamine, which is about 3 times better than the MoO3 sensor with (021) crystal plane growth orientation. Additionally, the sensors show superior linearity, reproducibility, and humidity resistance. The gas adsorption mechanisms on the material surfaces were elucidated through in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) characterization technique, XPS characterization analysis, and density functional theory (DFT) theoretical calculations. The results indicate that the exposed (040) crystal facets in MoO3 show a superior adsorption affinity for n-pentylamine. This research further broadens the potential applications of gas sensors that detect volatile organic compounds.

Graphical abstract