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<p>Fabrication of gas sensors with high sensibility appears particularly important due to the urgent demand for toxic gases monitoring in public safety and atmosphere detection, especially for the detection requirement of ultra-low concentration gases. Here, we present a rare three-dimensional (3D) all-inorganic polyoxoniobate (PONb) framework based on {Cu<sub>4</sub>@Nb<sub>29</sub>} secondary building units linked with both tetranuclear {Cu<sub>4</sub>(OH)<sub>5</sub>} clusters and mononuclear [Cu(H<sub>2</sub>O)]<sup>2+</sup> units. Remarkably, this 3D PONb framework exhibits an ultrasensitive response to NH<sub>3</sub> with a lowest limit of detection of 1.64 ppt up to now. Furthermore, the NH<sub>3</sub> induced single-crystal-to-single-crystal transformation as well as density functional theory analysis reveal that the strong coordination affinity of [Cu(H<sub>2</sub>O)]<sup>2+</sup> linker for NH<sub>3</sub>, along with more injection of charge into the framework, results in a ultrasensitivity chemiresistive responses to NH<sub>3</sub>, at atomic-level insight.</p>

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An all-inorganic three-dimensional polyoxoniobate framework with ppb-level chemiresistive sensing for ammonia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月10日

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  • Zheng-Wei Guo,
  • Yan-Huang Yan,
  • Yi Chen,
  • Yi-Ying Li,
  • Xin-Xiong Li,
  • Cai Sun,
  • Shou-Tian Zheng

摘要

Fabrication of gas sensors with high sensibility appears particularly important due to the urgent demand for toxic gases monitoring in public safety and atmosphere detection, especially for the detection requirement of ultra-low concentration gases. Here, we present a rare three-dimensional (3D) all-inorganic polyoxoniobate (PONb) framework based on {Cu4@Nb29} secondary building units linked with both tetranuclear {Cu4(OH)5} clusters and mononuclear [Cu(H2O)]2+ units. Remarkably, this 3D PONb framework exhibits an ultrasensitive response to NH3 with a lowest limit of detection of 1.64 ppt up to now. Furthermore, the NH3 induced single-crystal-to-single-crystal transformation as well as density functional theory analysis reveal that the strong coordination affinity of [Cu(H2O)]2+ linker for NH3, along with more injection of charge into the framework, results in a ultrasensitivity chemiresistive responses to NH3, at atomic-level insight.