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<p>Aimed at realizing the rapid and effective detection of carbon monoxide (CO) in high humidity environments, the NiO-modified In<sub>2</sub>O<sub>3</sub> nanocube with different NiO loadings (1, 3, 5&#xa0;mol%) was synthesized via a two-step method. Morphological characterizations revealed that the NiO modification did not alter the cubic morphology of In<sub>2</sub>O<sub>3</sub>, and the nanocube showed a porous structure with pore sizes of around 10&#xa0;nm. The XPS analysis evidenced that the 3&#xa0;mol% NiO/In<sub>2</sub>O<sub>3</sub> sample owns more Ov contents (40.62%) than that of the&#xa0;pure In<sub>2</sub>O<sub>3</sub> sample (31.73%). The gas sensing measurements demonstrated that the 3&#xa0;mol% NiO/In<sub>2</sub>O<sub>3</sub> sensor exhibited a decreased optimal operating temperature of 260℃ (300℃ for In<sub>2</sub>O<sub>3</sub>) and good stability. Compared with pristine In<sub>2</sub>O<sub>3</sub>, the 3&#xa0;mol% NiO/In<sub>2</sub>O<sub>3</sub> nanocube showed an enhanced response of 4.16 (2.73 for In<sub>2</sub>O<sub>3</sub>) to 500&#xa0;ppm CO and a rapid response/recovery time (10&#xa0;s/13&#xa0;s) toward CO. Furthermore, the 3&#xa0;mol% NiO/In<sub>2</sub>O<sub>3</sub> sensor exhibited superior humidity resistance, enabling accurate CO detection even at 85% relative humidity. The enhanced gas sensing performance of the NiO/In<sub>2</sub>O<sub>3</sub> nanocube is attributed to the unique porous cubic structure and the formation of p-n heterojunctions. This work demonstrates a viable strategy to improve the CO sensing capabilities of In<sub>2</sub>O<sub>3</sub> by constructing NiO/In<sub>2</sub>O<sub>3</sub> heterostructures.</p> Graphical abstract <p></p>

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Construction of heterojunctions of In2O3 nanocube with NiO for rapid detection of carbon monoxide 

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Saisai Zhang,
  • Yi Zheng,
  • Bo Zhang,
  • Bowen Zhang,
  • Na Luo,
  • Yan Wang

摘要

Aimed at realizing the rapid and effective detection of carbon monoxide (CO) in high humidity environments, the NiO-modified In2O3 nanocube with different NiO loadings (1, 3, 5 mol%) was synthesized via a two-step method. Morphological characterizations revealed that the NiO modification did not alter the cubic morphology of In2O3, and the nanocube showed a porous structure with pore sizes of around 10 nm. The XPS analysis evidenced that the 3 mol% NiO/In2O3 sample owns more Ov contents (40.62%) than that of the pure In2O3 sample (31.73%). The gas sensing measurements demonstrated that the 3 mol% NiO/In2O3 sensor exhibited a decreased optimal operating temperature of 260℃ (300℃ for In2O3) and good stability. Compared with pristine In2O3, the 3 mol% NiO/In2O3 nanocube showed an enhanced response of 4.16 (2.73 for In2O3) to 500 ppm CO and a rapid response/recovery time (10 s/13 s) toward CO. Furthermore, the 3 mol% NiO/In2O3 sensor exhibited superior humidity resistance, enabling accurate CO detection even at 85% relative humidity. The enhanced gas sensing performance of the NiO/In2O3 nanocube is attributed to the unique porous cubic structure and the formation of p-n heterojunctions. This work demonstrates a viable strategy to improve the CO sensing capabilities of In2O3 by constructing NiO/In2O3 heterostructures.

Graphical abstract