2013 Fiscal Year Final Research Report
Catalytic Activity of Expanded Interface between Gold Nanoparticle and Titania Substrate
| Project/Area Number |
24656031
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Thin film/Surface and interfacial physical properties
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
TANAKA Takayuki 東京工業大学, 量子ナノエレクトロニクス研究センター, 助教 (10367120)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | ナノ粒子触媒 / 表面界面物理学 / 触媒環境科学 / 透過電子顕微鏡 / 電子エネルギー損失分光法 / カソードルミネッセンス分光 / 余剰電子 |
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| Research Abstract |
We have studied catalysis of gold nanoparticles on TiO2 (Au/TiO2). We directly observed interstitial Ti ion, which has been proposed as a source of an excess electron for O2 activation. Interstitials exists at an interface and/or perimeter of Au/TiO2, whereas they are deficient in a peripheral region of the gold nanoparticles. The interstitials concentrated into the Au/TiO2 interface are consistent with the previous report of the growth of Au/TiO2 interface in O2 exposure, because interstitials react adsorbed O2 to form Ti(1-x)O2 structure, x>0. The interstitial ions at the perimeter/interface of Au/TiO2 are a promising candidate of a source of an excess electron for O2 activation in CO oxidation catalysis. Based on cathode luminescence spectra of Au/TiO2 taken in CO, O2 and CO+O2, we proposed a model that superoxide of Ti(1-x)O2 promotes CO oxidation catalysis.
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