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<p>This study presents a series of high-sensitivity sensors based on BiVO<sub>4</sub>-La<sub>2</sub>O<sub>3</sub> (Bismuth vanadate-Lanthanum oxide). nanocomposite, synthesized using a simple hydrothermal process for the detection of NO<sub>2</sub> gas at room temperature. As-prepared samples were characterized using X-ray diffraction (XRD), ultraviolet visible spectroscopy (UV-vis), and Fourier transform infrared spectroscopy (FTIR). BiVO<sub>4</sub>-La<sub>2</sub>O<sub>3</sub> achieved excellent NO<sub>2</sub> gas sensing performance, including high sensor responsivity (Rg/Ra) of 13.5 at concentrations ranging from 0.1 ppm to 10 ppm, as well as fast response (T<sub>90</sub> = 76&#xa0;s) and recovery (T<sub>r90</sub> = 66&#xa0;s) times at 0.1 ppm. These results demonstrate the potential of BiVO₄–La₂O₃ nanocomposites for reliable ppb-level NO₂ detection at room temperature.</p>

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Preparation of BiVO4-La2O3 Nanocomposite for Highly Responsive Trace Nitrogen Dioxide Gas Sensor

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Zhen Zhu,
  • Wang-De Lin

摘要

This study presents a series of high-sensitivity sensors based on BiVO4-La2O3 (Bismuth vanadate-Lanthanum oxide). nanocomposite, synthesized using a simple hydrothermal process for the detection of NO2 gas at room temperature. As-prepared samples were characterized using X-ray diffraction (XRD), ultraviolet visible spectroscopy (UV-vis), and Fourier transform infrared spectroscopy (FTIR). BiVO4-La2O3 achieved excellent NO2 gas sensing performance, including high sensor responsivity (Rg/Ra) of 13.5 at concentrations ranging from 0.1 ppm to 10 ppm, as well as fast response (T90 = 76 s) and recovery (Tr90 = 66 s) times at 0.1 ppm. These results demonstrate the potential of BiVO₄–La₂O₃ nanocomposites for reliable ppb-level NO₂ detection at room temperature.