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<p>NiO/In<sub>2</sub>O<sub>3</sub> nanosheet heterojunctions with enhanced sensitivity to 2,7-Dichlorodibenzo-p-dioxin(2,7-PCDD) were successfully synthesized by solvothermal method and subsequent calcination. Characterization results demonstrate that NiO/In<sub>2</sub>O<sub>3</sub> possesses a porous sheet structure with a size of approximately 1–2&#xa0;μm, and NiO is relatively evenly distributed throughout. As revealed by XPS analysis, numerous oxygen vacancies exist in NiO/In<sub>2</sub>O<sub>3</sub> nanosheets. Gas sensing results revealed that, compared to the In<sub>2</sub>O<sub>3</sub> nanosheet sensor, the NiO/In<sub>2</sub>O<sub>3</sub> nanosheet sensor exhibited a superior response to 2,7-PCDD over other dioxin gases. At 250&#xa0;°C, NiO/In<sub>2</sub>O<sub>3</sub> nanosheet heterojunction sensor exhibits a sensitivity of 41–30&#xa0;ppm of 2,7-PCDD, which is about 1.5 times higher than that of the In<sub>2</sub>O<sub>3</sub> nanosheet sensor (with a sensitivity of 27). The NiO/In<sub>2</sub>O<sub>3</sub> nanosheet heterojunction sensor showed a good linear relationship with different concentrations of 2,7-PCDD and remarkable repeatability. The formation of NiO/In<sub>2</sub>O<sub>3</sub> heterojunctions and the porous structure of the material contributed to the increase in sensitivity.</p> Graphical abstract <p></p>

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NiO/In2O3 nanosheet heterojunction for the gas sensing detection of 2,7-dichlorodibenzo-p-dioxin

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • Liping Gao,
  • Liwei Wang,
  • Hongjie Liu,
  • Jincheng Cao,
  • Junhai Wang

摘要

NiO/In2O3 nanosheet heterojunctions with enhanced sensitivity to 2,7-Dichlorodibenzo-p-dioxin(2,7-PCDD) were successfully synthesized by solvothermal method and subsequent calcination. Characterization results demonstrate that NiO/In2O3 possesses a porous sheet structure with a size of approximately 1–2 μm, and NiO is relatively evenly distributed throughout. As revealed by XPS analysis, numerous oxygen vacancies exist in NiO/In2O3 nanosheets. Gas sensing results revealed that, compared to the In2O3 nanosheet sensor, the NiO/In2O3 nanosheet sensor exhibited a superior response to 2,7-PCDD over other dioxin gases. At 250 °C, NiO/In2O3 nanosheet heterojunction sensor exhibits a sensitivity of 41–30 ppm of 2,7-PCDD, which is about 1.5 times higher than that of the In2O3 nanosheet sensor (with a sensitivity of 27). The NiO/In2O3 nanosheet heterojunction sensor showed a good linear relationship with different concentrations of 2,7-PCDD and remarkable repeatability. The formation of NiO/In2O3 heterojunctions and the porous structure of the material contributed to the increase in sensitivity.

Graphical abstract