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<p>Bi<sub>2</sub>MoO<sub>6</sub> nanosheets were prepared via a hydrothermal method using polyvinylpyrrolidone (PVP) as an additive. The structure, morphology, and crystalline phase of the samples were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption technique. The results revealed that the addition of PVP effectively refined the crystal size from 25 ± 0.4&#xa0;nm to 17 ± 0.2&#xa0;nm and increased the specific surface area from 6.42 to 9.70 m<sup>2</sup>/g, leading to more uniform and smoother nanosheets. The gas sensor based on Bi<sub>2</sub>MoO<sub>6</sub> nanosheets exhibits good sensing performance, with a notably higher response to ethanol than to other gases. At an operating temperature of 350&#xa0;°C, its response to 100&#xa0;ppm ethanol is 16.2, with a response time of 4&#xa0;s and a recovery time of 102&#xa0;s. In addition, sensors based on this composite material have significant selectivity, good repeatability, and stability. The enhanced gas-sensing performance stems primarily from the larger specific surface area and more abundant active sites created by the PVP-induced morphological optimization. The results show that the nanosheet Bi<sub>2</sub>MoO<sub>6</sub> exhibits significant ethanol selectivity and rapid response characteristics and is a potentially excellent sensing material.</p>

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PVP-modified Bi2MoO6 nanosheets for highly selective ethanol gas sensing

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Lei Gao,
  • Yiting Rui,
  • Jinming Yang,
  • Zichuan Yi,
  • Yao Wang,
  • Zhidong Lin,
  • Xiaowen Zhang,
  • Liming Liu

摘要

Bi2MoO6 nanosheets were prepared via a hydrothermal method using polyvinylpyrrolidone (PVP) as an additive. The structure, morphology, and crystalline phase of the samples were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption technique. The results revealed that the addition of PVP effectively refined the crystal size from 25 ± 0.4 nm to 17 ± 0.2 nm and increased the specific surface area from 6.42 to 9.70 m2/g, leading to more uniform and smoother nanosheets. The gas sensor based on Bi2MoO6 nanosheets exhibits good sensing performance, with a notably higher response to ethanol than to other gases. At an operating temperature of 350 °C, its response to 100 ppm ethanol is 16.2, with a response time of 4 s and a recovery time of 102 s. In addition, sensors based on this composite material have significant selectivity, good repeatability, and stability. The enhanced gas-sensing performance stems primarily from the larger specific surface area and more abundant active sites created by the PVP-induced morphological optimization. The results show that the nanosheet Bi2MoO6 exhibits significant ethanol selectivity and rapid response characteristics and is a potentially excellent sensing material.