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<p>Molybdenum trioxide (MoO<sub>3</sub>), an n-type indirect bandgap metal oxide semiconductor, exhibits unique optical/electronic properties, layered structure, and excellent catalytic performance, making it suitable for optoelectronic devices, energy storage, and catalysis. Its inherent semiconductor characteristics provide high sensitivity to gas presence. Researchers have recognized that the acidity of MoO<sub>3</sub> enables effective detection of alkaline gases such as trimethylamine (TMA) and triethylamine (TEA). Therefore, MoO<sub>3</sub> is an ideal candidate for detecting TEA, a harmful volatile organic compound (VOC). In this study, Au nanoparticles were loaded onto orthorhombic MoO<sub>3</sub> via a facile wet-chemical method. The optimized sensor demonstrated a 20&#xa0;℃ reduction in operating temperature, a sixfold enhancement in response (119.6) to 10&#xa0;ppm TEA, a shortened recovery time (from 41 to 12&#xa0;s), and a low detection limit (0.25&#xa0;ppm). These improvements achieved enhanced response, low-concentration detection capability, and reduced operational temperature.</p>

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High sensitivity and selectivity of Au nanoparticle-modified MoO3 based composites for TEA detection

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Mengfan Liu,
  • Chenbing Han,
  • Yu Tian,
  • Xiang Shen,
  • Fei Li

摘要

Molybdenum trioxide (MoO3), an n-type indirect bandgap metal oxide semiconductor, exhibits unique optical/electronic properties, layered structure, and excellent catalytic performance, making it suitable for optoelectronic devices, energy storage, and catalysis. Its inherent semiconductor characteristics provide high sensitivity to gas presence. Researchers have recognized that the acidity of MoO3 enables effective detection of alkaline gases such as trimethylamine (TMA) and triethylamine (TEA). Therefore, MoO3 is an ideal candidate for detecting TEA, a harmful volatile organic compound (VOC). In this study, Au nanoparticles were loaded onto orthorhombic MoO3 via a facile wet-chemical method. The optimized sensor demonstrated a 20 ℃ reduction in operating temperature, a sixfold enhancement in response (119.6) to 10 ppm TEA, a shortened recovery time (from 41 to 12 s), and a low detection limit (0.25 ppm). These improvements achieved enhanced response, low-concentration detection capability, and reduced operational temperature.