2003 Fiscal Year Final Research Report Summary
Development of noble metal nano-composite electrode for gas sensors
| Project/Area Number |
13555184
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tohoku University |
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Principal Investigator |
GOTO Takashi Tohoku University, Institute for Materials Research, Professor, 金属材料研究所, 教授 (60125549)
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| Co-Investigator(Kenkyū-buntansha) |
MASUMOTO Hiroshi Tohoku University, Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (50209459)
AKASHI Takaya Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (20312647)
KIMURA Teiichi Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (10333882)
MIYAZAKI Hidetoshi Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (60344719)
ONO Takashi RIKEN Co., Ltd., R&D Center, Researcher, 研究員
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| Project Period (FY) |
2001 – 2003
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| Keywords | electrode / catalyst / oxygen sensor / noble metal / nano-composite / CVD / concentration cell / ac impedance |
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| Research Abstract |
Noble metal(Ir or Ru) nano-composite films were synthesized by chemical vapor deposition using beta-diketonato complexes as precursors, and their microstructures and electrode properties for gas sensors were studied. Ir-YSZ nano-composite electrodes consisted of amorphous YSZ and Ir particles of 5-10 nm in diameter. The interfacial conductivity for the Ir-YSZ electrodes was almost 1000 times higher than that of sputtered-Pt electrodes due to large contact area between YSZ and Ir in nano-composite electrodes and high catalytic activity of Ir nano-particles. The electro-motive-force values of the oxygen concentration cell constructed from the Ir-YSZ electrodes and YSZ electrolyte showed the Nernstian theoretical values and the response time was 10-20s at 650℃. Ir-C and Ru-C nano-composite films containing about 50 vol% of carbon were prepared by MOCVD, and their microstructures and electrode properties were investigated. Ir or Ru particles of 5-20 nm in diameter were dispersed in amorphous C matrix. The AC conductivities associating to the interface charge transfer between 1r-C or Ru-C composite electrode and YSZ electrolyte were 100-1000 times higher than that of Pt electrodes. The emf values of the oxygen gas concentration cell constructed from the nano-composite electrodes and YSZ electrolyte showed the Nernstian theoretical values at low temperatures around 500 K. The response time of the concentration cell was 110 s at 550 K for Ir-C and 900 s at 500 K for Ru-C nano-composite electrodes.
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Research Products
(4 results)
