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<p>The development of a highly responsive and selective gas sensor for volatile organic compounds, such as hydrogen sulfide and acetone, is still required. In this study, FeWO<sub>4</sub> hollow spheres modified with Pd nanoparticles were synthesized using ammonium phosphotungstate hydrate dodecahedra as sacrificial templates followed by liquid-phase reduction. The morphologies, microstructures, and gas-sensing characteristics of as-prepared sensing nanomaterials have been investigated. The tiny Pd nanoparticles are well anchored on the FeWO<sub>4</sub> hollow spheres. At the working temperature of 280 °C, the 3 wt.% Pd/FeWO<sub>4</sub> hollow sphere sensor exhibits higher sensitivity to acetone and ethanol gasses than unmodified FeWO<sub>4</sub> hollow spheres, as well as good repeatability and fast response. Meanwhile, the 3-Pd/FeWO<sub>4</sub> hollow sphere sensor at a low operation temperature of 25 °C exhibits a high response of 2.3–10 ppm hydrogen sulfide with excellent selectivity, which is much stronger than that of the FeWO<sub>4</sub> sensor. The outstanding performance of the 3-Pd/FeWO<sub>4</sub> hollow sphere sensor is attributable to its exceptional hollow microstructure with a high specific surface area and the catalytic properties of Pd nanoparticles.</p>

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Preparation of Pd nanoparticle-modified FeWO4 hollow spheres for highly selective hydrogen sulfide and acetone detection

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Chen Chen,
  • Jie Chang,
  • Yu Sun,
  • Areeje Fatima,
  • Jiarui Huang

摘要

The development of a highly responsive and selective gas sensor for volatile organic compounds, such as hydrogen sulfide and acetone, is still required. In this study, FeWO4 hollow spheres modified with Pd nanoparticles were synthesized using ammonium phosphotungstate hydrate dodecahedra as sacrificial templates followed by liquid-phase reduction. The morphologies, microstructures, and gas-sensing characteristics of as-prepared sensing nanomaterials have been investigated. The tiny Pd nanoparticles are well anchored on the FeWO4 hollow spheres. At the working temperature of 280 °C, the 3 wt.% Pd/FeWO4 hollow sphere sensor exhibits higher sensitivity to acetone and ethanol gasses than unmodified FeWO4 hollow spheres, as well as good repeatability and fast response. Meanwhile, the 3-Pd/FeWO4 hollow sphere sensor at a low operation temperature of 25 °C exhibits a high response of 2.3–10 ppm hydrogen sulfide with excellent selectivity, which is much stronger than that of the FeWO4 sensor. The outstanding performance of the 3-Pd/FeWO4 hollow sphere sensor is attributable to its exceptional hollow microstructure with a high specific surface area and the catalytic properties of Pd nanoparticles.