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<p>Loading precious metals nanoparticles on the surface of metal oxide semiconductors can effectively reduce the activation energy of carriers participating in oxidation–reduction reactions, which would enhance the gas sensing performance of metal oxides. In this work, a gas sensor was designed based on porous In<sub>2</sub>O<sub>3</sub> nanocubes loaded with Au nanoparticles to achieve highly efficient and selective detection of formaldehyde gas at room temperature. The successful loading of gold nanoparticles onto the In<sub>2</sub>O<sub>3</sub> surface was verified by characterization techniques, including TEM and XPS. The designed Au-In<sub>2</sub>O<sub>3</sub> sensor demonstrated a high response value of 70 to a concentration of 10&#xa0;ppm HCHO gas at 30 ℃. Moreover, the developed Au-In<sub>2</sub>O<sub>3</sub> sensor exhibits high selectivity, rapid response/recovery time and excellent long-term stability for the detection of formaldehyde gas at room temperature. This study contributes to advancing research and practical application in the field of sensor.</p>

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Au-loaded porous In2O3 nanocubes with high sensitivity for formaldehyde detection at room temperature

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Yilin Gao,
  • Liangyu Zhai,
  • Qadeer-Ul Hassan,
  • Chen Sun,
  • Xinhua Li,
  • Zhenni Li,
  • Mingping Ran,
  • Gangqiang Zhu

摘要

Loading precious metals nanoparticles on the surface of metal oxide semiconductors can effectively reduce the activation energy of carriers participating in oxidation–reduction reactions, which would enhance the gas sensing performance of metal oxides. In this work, a gas sensor was designed based on porous In2O3 nanocubes loaded with Au nanoparticles to achieve highly efficient and selective detection of formaldehyde gas at room temperature. The successful loading of gold nanoparticles onto the In2O3 surface was verified by characterization techniques, including TEM and XPS. The designed Au-In2O3 sensor demonstrated a high response value of 70 to a concentration of 10 ppm HCHO gas at 30 ℃. Moreover, the developed Au-In2O3 sensor exhibits high selectivity, rapid response/recovery time and excellent long-term stability for the detection of formaldehyde gas at room temperature. This study contributes to advancing research and practical application in the field of sensor.