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<p>Pt–SnO<sub>2</sub> composite nanoceramics recently have drawn much attention for their strong responses to CO at room temperature and a remarkable long-term stability. To further improve their microstructure and performance, in this study, a solution reduction Pt-loading method was used to deposit Pt nanoparticles (~ 5&#xa0;nm) on SnO<sub>2</sub> nanoparticles, from which Pt–SnO<sub>2</sub> composite nanoceramics were prepared through pressing and sintering. Not only a much improved Pt distribution was revealed for the nanoceramics according to field emission scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy analyses, their room-temperature responses to CO were also greatly enhanced. To 0.04% CO–20%O<sub>2</sub>–N<sub>2</sub>, a room-temperature response as high as 2427 was obtained for 1 wt% Pt–SnO<sub>2</sub> composite nanoceramics, which was increased by more than 20 times from that shown by Pt–SnO<sub>2</sub> composite nanoceramics prepared previously. A room-temperature CO-sensing mechanism has been first established for Pt–SnO<sub>2</sub> system, in which Pt catalyzes not only the chemisorption of oxygen molecules on SnO<sub>2</sub> at room temperature but also the reaction between CO and chemisorbed oxygen at room temperature. These results clearly demonstrate a promising prospect for Pt–SnO<sub>2</sub> composite nanoceramics in realizing reliable and convenient CO detection.</p>

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Greatly improved room-temperature CO-sensing capability of Pt–SnO2 composite nanoceramics prepared using solution reduction Pt-loading method

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Jiannan Song,
  • Jieting Zhao,
  • Menghan Wu,
  • Yongming Hu,
  • Wanping Chen

摘要

Pt–SnO2 composite nanoceramics recently have drawn much attention for their strong responses to CO at room temperature and a remarkable long-term stability. To further improve their microstructure and performance, in this study, a solution reduction Pt-loading method was used to deposit Pt nanoparticles (~ 5 nm) on SnO2 nanoparticles, from which Pt–SnO2 composite nanoceramics were prepared through pressing and sintering. Not only a much improved Pt distribution was revealed for the nanoceramics according to field emission scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy analyses, their room-temperature responses to CO were also greatly enhanced. To 0.04% CO–20%O2–N2, a room-temperature response as high as 2427 was obtained for 1 wt% Pt–SnO2 composite nanoceramics, which was increased by more than 20 times from that shown by Pt–SnO2 composite nanoceramics prepared previously. A room-temperature CO-sensing mechanism has been first established for Pt–SnO2 system, in which Pt catalyzes not only the chemisorption of oxygen molecules on SnO2 at room temperature but also the reaction between CO and chemisorbed oxygen at room temperature. These results clearly demonstrate a promising prospect for Pt–SnO2 composite nanoceramics in realizing reliable and convenient CO detection.