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<p>Hydrogen sulfide (H<sub>2</sub>S) is a highly toxic and flammable gas that is also an important indicator of meat spoilage. Therefore, real-time and accurate detection of H<sub>2</sub>S concentration is essential to ensure environmental safety and human health. Despite its significance, achieving highly sensitive detection of H<sub>2</sub>S gases at low temperatures remains a formidable challenge. In this study, we used the biomass template method to controllably prepare CuCrO<sub>2</sub>-doped Cr<sub>2</sub>O<sub>3</sub> p-p heterojunction hollow tubes. Among them, the 10.93 wt% Cu-doped Cr<sub>2</sub>O<sub>3</sub> sensing material (Cu-Cr<sub>2</sub>O<sub>3</sub>-3) obtained by calcination at 500 °C has a good overall gas-sensing performance to H<sub>2</sub>S gas. It has a response value of up to 441.2 for 100 ppm H<sub>2</sub>S gas at 92 °C, as well as good selectivity, low calculated detection limit of 11.15 ppb and humidity resistance. Meanwhile, the reasons for the performance differences between the 5 composites were explored in detail by using various characterisation methods. The gas sensing mechanism of the Cu-Cr<sub>2</sub>O<sub>3</sub>-3 sensor was also analysed by combining MS, XPS and ‘quasi-in-situ’ Raman spectrum. In addition, we carried out experiments on the freshness detection of pork and shrimp by the Cu-Cr<sub>2</sub>O<sub>3</sub>-3 sensor, confirming its potential application in meat freshness evaluation.</p> Graphical Abstract <p></p>

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CuCrO2/Cr2O3 heterojunction gas sensor for low-temperature and high response H2S detection and its application for meat freshness evaluation

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Baoyu Song,
  • Jinghan Wang,
  • Xiaona Zhang,
  • Kuo Lin,
  • Wenxiao Li,
  • Fei Ye,
  • Ying Fu,
  • Yingming Xu

摘要

Hydrogen sulfide (H2S) is a highly toxic and flammable gas that is also an important indicator of meat spoilage. Therefore, real-time and accurate detection of H2S concentration is essential to ensure environmental safety and human health. Despite its significance, achieving highly sensitive detection of H2S gases at low temperatures remains a formidable challenge. In this study, we used the biomass template method to controllably prepare CuCrO2-doped Cr2O3 p-p heterojunction hollow tubes. Among them, the 10.93 wt% Cu-doped Cr2O3 sensing material (Cu-Cr2O3-3) obtained by calcination at 500 °C has a good overall gas-sensing performance to H2S gas. It has a response value of up to 441.2 for 100 ppm H2S gas at 92 °C, as well as good selectivity, low calculated detection limit of 11.15 ppb and humidity resistance. Meanwhile, the reasons for the performance differences between the 5 composites were explored in detail by using various characterisation methods. The gas sensing mechanism of the Cu-Cr2O3-3 sensor was also analysed by combining MS, XPS and ‘quasi-in-situ’ Raman spectrum. In addition, we carried out experiments on the freshness detection of pork and shrimp by the Cu-Cr2O3-3 sensor, confirming its potential application in meat freshness evaluation.

Graphical Abstract