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<p>A simple and low-cost hydrothermal method has been used to construct heterojunction nanocomposites with α-Fe<sub>2</sub>O<sub>3</sub> and SnO<sub>2</sub> nanospheres, and the optimal preparation conditions were determined by orthogonal experimental design. X-ray diffraction, specific surface area testing, scanning electron microscopy, and other characterization methods have been used to characterize the nanocomposites. The results show that, by attaching α-Fe<sub>2</sub>O<sub>3</sub> particles to SnO<sub>2</sub> nanospheres, the specific surface area of the material can reach 112.4603&#xa0;m<sup>2</sup>/g. After a systematic gas sensitivity test, the sensitivity of the gas sensor prepared by composite nanomaterials for 100&#xa0;ppm ethanol reached 33.08 at 220&#xa0;°C, and the response time (3&#xa0;s) and recovery time (6&#xa0;s) were short, and were greatly improved compared with pure SnO<sub>2</sub>. In addition, the gas sensor fabricated by this composite nanomaterial had excellent stability, and its sensitivity remained basically unchanged after 60&#xa0;days. Therefore, SnO<sub>2</sub>/α-Fe<sub>2</sub>O<sub>3</sub> heterojunction nanocomposites can be an ideal material.</p>

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Ultrasensitive Ethanol Response of Hydrothermally Synthesized α-Fe2O3 and SnO2 Nanosphere Heterojunctions

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • Ke Zhang,
  • Wenrui Zhang,
  • Pengdang Zhu,
  • Ruiyu Zhang,
  • Tianfeng Chen

摘要

A simple and low-cost hydrothermal method has been used to construct heterojunction nanocomposites with α-Fe2O3 and SnO2 nanospheres, and the optimal preparation conditions were determined by orthogonal experimental design. X-ray diffraction, specific surface area testing, scanning electron microscopy, and other characterization methods have been used to characterize the nanocomposites. The results show that, by attaching α-Fe2O3 particles to SnO2 nanospheres, the specific surface area of the material can reach 112.4603 m2/g. After a systematic gas sensitivity test, the sensitivity of the gas sensor prepared by composite nanomaterials for 100 ppm ethanol reached 33.08 at 220 °C, and the response time (3 s) and recovery time (6 s) were short, and were greatly improved compared with pure SnO2. In addition, the gas sensor fabricated by this composite nanomaterial had excellent stability, and its sensitivity remained basically unchanged after 60 days. Therefore, SnO2/α-Fe2O3 heterojunction nanocomposites can be an ideal material.