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<p>To meet the requirements for practical gas sensor applications, improvements in sensitivity, rapid response/recovery times, and low operating temperatures are essential. In this work, porous ZnO hollow nanocages (HNCs) functionalized with Pd/PdO nanoclusters were fabricated. Uniformly dispersed Pd/PdO nanoclusters (~ 5&#xa0;nm) on mesoporous ZnO HNCs were successfully achieved. The optimal Pd modification, specifically 0.5&#xa0;mL Pd@ZnO HNCs, led to significantly enhanced acetone sensing performance. A 4.38-fold increase in response to 50&#xa0;ppm acetone and a reduction in the optimal working temperature from 325 to 250&#xa0;°C were observed, compared to ZnO HNCs. Additionally, the sensor exhibited faster response times, enhanced selectivity, and outstanding reproducibility and stability for acetone detection. The enhanced performance was ascribed to the synergistic effects of Schottky junctions formed between Pd nanoclusters and ZnO, along with the catalytic and electronic sensitization effects of Pd/PdO nanoclusters. This research presents a straightforward and controllable approach to developing porous metal oxides derived from MOFs, functionalized with Pd/PdO nanoclusters, to enhance gas sensing performance.</p>

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MOF-derived ZnO hollow nanocages decorated with Pd/PdO nanoclusters for improved acetone sensing performance

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Yaxuan Gao,
  • Jinniu Zhang,
  • Shuangyan Wang,
  • Jiaxin Zhang,
  • Dehua Liu,
  • Guangming Xie,
  • Tong Xu,
  • Deying Leng,
  • Jiawei Guo

摘要

To meet the requirements for practical gas sensor applications, improvements in sensitivity, rapid response/recovery times, and low operating temperatures are essential. In this work, porous ZnO hollow nanocages (HNCs) functionalized with Pd/PdO nanoclusters were fabricated. Uniformly dispersed Pd/PdO nanoclusters (~ 5 nm) on mesoporous ZnO HNCs were successfully achieved. The optimal Pd modification, specifically 0.5 mL Pd@ZnO HNCs, led to significantly enhanced acetone sensing performance. A 4.38-fold increase in response to 50 ppm acetone and a reduction in the optimal working temperature from 325 to 250 °C were observed, compared to ZnO HNCs. Additionally, the sensor exhibited faster response times, enhanced selectivity, and outstanding reproducibility and stability for acetone detection. The enhanced performance was ascribed to the synergistic effects of Schottky junctions formed between Pd nanoclusters and ZnO, along with the catalytic and electronic sensitization effects of Pd/PdO nanoclusters. This research presents a straightforward and controllable approach to developing porous metal oxides derived from MOFs, functionalized with Pd/PdO nanoclusters, to enhance gas sensing performance.