2013 Fiscal Year Final Research Report
Pore-size control dynamics of nanoporous metals based on in-situ observations and atomic simulation
| Project/Area Number |
23360305
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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 | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kyoto University |
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Principal Investigator |
MAMORU MABUCHI 京都大学, エネルギー科学研究科, 教授 (00358061)
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| Co-Investigator(Kenkyū-buntansha) |
NAKANO Hiromi 豊橋技術科学大学, 研究基盤センター, 教授 (00319500)
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| Co-Investigator(Renkei-kenkyūsha) |
HAKAMADA Masataka 京都大学, 大学院・エネルギー科学研究科, 准教授 (30462849)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 金 / ナノポーラス / 脱合金化 / 高温その場観察 / 触媒 |
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| Research Abstract |
In-situ transmission electron microscopic observations of nanoporous Au at high temperatures were conducted. Nonuniform coarsening occured even in an identical sample which had been fabricated by sputtering of Au-Ag and subsequent dealloying. Therefore it is suggested that the estimation of coarsening behavior is difficult because of this nonuniformness.
As a probe for surface area of nanoporous metals, catalytic properties of nanoporous Au for decoloration of organic dyes were examined. The reaction kinetic constant for decomposition of methyl orange was not proportional to the surface area estimated by cyclic voltammetry. Therefore the atomic defects on ligament surface of nanoporous Au serve as specific points for the catalytic reaction. The role of surface atomic defects is also supported by the electronic structure by atomic defects on the Au (111) surface simulated by first-principles calculations.
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