Gas sensing capabilities of TiO2 porous nanoceramics prepared through premature sintering

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• 作者：Yao Xiong ; Zilong Tang ; Yu Wang ; Yongming Hu ; Haoshuang Gu…
• 关键词：TiO2 ; porous nanoceramics ; premature sintering ; sensors ; hydrogen ; CO
• 刊名：Journal of Advanced Ceramics
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：4
• 期：2
• 页码：152-157
• 全文大小：1,237 KB
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• 作者单位：Yao Xiong (1)
  Zilong Tang (2)
  Yu Wang (3)
  Yongming Hu (4)
  Haoshuang Gu (4)
  Yuanzhi Li (5)
  Helen Lai Wah Chan (3)
  Wanping Chen (1)
  
  1. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan, 430072, China
  2. School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, China
  3. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hong Kong, China
  4. Faculty of Physics and Electronic Technology, Hubei University, Wuhan, 430062, China
  5. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China
  
• 刊物主题：Ceramics, Glass, Composites, Natural Methods; Characterization and Evaluation of Materials; Nanotechnology; Structural Materials;
• 出版者：Springer Berlin Heidelberg
• ISSN：2227-8508

文摘

Pure and noble metal (Pt, Pd, and Au) doped TiO₂ nanoceramics have been prepared from TiO₂ nanoparticles through traditional pressing and sintering. For those samples sintered at 550 °C, a typical premature sintering occurred, which led to the formation of a highly porous microstructure with a Brunauer-Emmett-Teller (BET) specific surface area of 23 m2/g. At room temperature, only Pt-doped samples showed obvious response to hydrogen, with sensitivities as high as ?00 for 1000 ppm H₂ in N₂; at 300 °C, all samples showed obvious responses to CO, while the responses of noble metal doped samples were much higher than that of the undoped ones. The mechanism for the observed sensing capabilities has been discussed, in which the catalytic effect of Pt for hydrogen is believed responsible for the room-temperature hydrogen sensing capabilities, and the absence of glass frit as commonly used in commercial thick-film metal oxide gas sensors is related to the high sensitivities. It is proposed that much attention should be paid to metal oxide porous nanoceramics in developing gas sensors with high sensitivities and low working temperatures.