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<p>Biomimetic architecture materials with abundant pores and oxygen vacancies hold great promise for boosting gas-sensing performance, yet not utilized for highly efficient detection of toxic butyl mercaptan (BM) vapor. For this purpose, the shell of metaplexis japonica template was employed as a structure-directing template for the controllable synthesis of three biomimetic Cr<sub>2</sub>O<sub>3</sub> materials <i>via</i> a facile process involving impregnation with aqueous chromium nitrate solution followed by air calcination. Among them, Cr<sub>2</sub>O<sub>3</sub>-500 material obtained by calcination at 500&#xa0;°C features wrinkled architecture replicated from uniformly small-size nanoparticles, coupled with abundant pores and surface oxygen vacancies. The cooperation among these microstructural characteristics not only accelerates the diffusion of gas molecules to the sensing layer, but also increases the number of adsorption sites for surface reaction and the concentration of surface adsorbed oxygen species, thereby effectively enhancing the highly selective and sensitive response to trace BM vapor at low operating temperature. At the optimal temperature of 133&#xa0;°C, the Cr<sub>2</sub>O<sub>3</sub>-500 sensor delivers a high response of 247.8 toward 100 ppm BM, along with the response/recovery times of 86&#xa0;s/51 s. Furthermore, it also presents favorable selectivity, reversible response-recovery behavior, as well as satisfactory moisture tolerance and stability. Additionally, the sensing mechanism underlying the trace BM detection was investigated in detail by combining multiple characterization techniques.</p> Graphical Abstract <p></p>

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Oxygen vacancy-enriched Cr2O3 wrinkled biomimetic architecture via shell of metaplexis japonica for rapid recovery and sensitive detection of butylmercaptan vapor

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Yu-Jia Zhu,
  • Hui-Nan Lei,
  • Ming-Yan Cao,
  • Yan Liu,
  • Zhao-Peng Deng,
  • Xian-Fa Zhang,
  • Ying-Ming Xu,
  • Li-Hua Huo,
  • Shan Gao

摘要

Biomimetic architecture materials with abundant pores and oxygen vacancies hold great promise for boosting gas-sensing performance, yet not utilized for highly efficient detection of toxic butyl mercaptan (BM) vapor. For this purpose, the shell of metaplexis japonica template was employed as a structure-directing template for the controllable synthesis of three biomimetic Cr2O3 materials via a facile process involving impregnation with aqueous chromium nitrate solution followed by air calcination. Among them, Cr2O3-500 material obtained by calcination at 500 °C features wrinkled architecture replicated from uniformly small-size nanoparticles, coupled with abundant pores and surface oxygen vacancies. The cooperation among these microstructural characteristics not only accelerates the diffusion of gas molecules to the sensing layer, but also increases the number of adsorption sites for surface reaction and the concentration of surface adsorbed oxygen species, thereby effectively enhancing the highly selective and sensitive response to trace BM vapor at low operating temperature. At the optimal temperature of 133 °C, the Cr2O3-500 sensor delivers a high response of 247.8 toward 100 ppm BM, along with the response/recovery times of 86 s/51 s. Furthermore, it also presents favorable selectivity, reversible response-recovery behavior, as well as satisfactory moisture tolerance and stability. Additionally, the sensing mechanism underlying the trace BM detection was investigated in detail by combining multiple characterization techniques.

Graphical Abstract