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Formation of nanoporous structure on gold nanoparticle by dealloying

Research Project

Project/Area Number 25886002
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Nanomaterials chemistry
Research InstitutionTohoku University

Principal Investigator

ITO Yoshikazu  東北大学, 原子分子材料科学高等研究機構, 助教 (90700170)

Project Period (FY) 2013-08-30 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords脱合金 / ナノ多孔質 / 金銀合金 / ナノ粒子 / 電子顕微鏡 / 幾何学ポテンシャル / 化学ポテンシャル / 腐食 / その場観察 / 多孔質構造
Outline of Final Research Achievements

Corrosion of alloy metal is a very important research target to determine their durable life and performance under various kinds of environment. The corrosion is very familiar to human being but the process of corrosion has not been understood in atomic dynamics very well. In this study, the corrosion process of gold-silver alloy metal was observed by transmission electron microscope and the mechanism of the corrosion process was partly understood. The larger alloy metal (over 13 nm) demonstrates same process with bulk alloy metals and the metal which is easy to dissolve was selectively dissolved. Conversely, the smaller alloy metal (0-10 nm) demonstrates no selective dissolution and both components were dissolved simultaneously. In this critical diameter of 10-13 nm, it is found that the balance of geometric potential of the alloy metal size and chemical potential difference between gold and silver control the dissolution mechanism.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Annual Research Report
  • Research Products

    (2 results)

All 2014 2013

All Presentation (2 results)

  • [Presentation] 金銀合金ナノ粒子の脱合金化その場観察2014

    • Author(s)
      伊藤 良一,藤田 武志,平田 秋彦,陳 明偉
    • Organizer
      日本化学会第94春季年会
    • Place of Presentation
      名古屋大学 東山キャンパス
    • Related Report
      2013 Annual Research Report
  • [Presentation] 金銀合金ナノ粒子の脱合金化の粒径依存性2013

    • Author(s)
      伊藤 良一,藤田 武志,平田 秋彦,陳 明偉
    • Organizer
      第7回分子科学討論会
    • Place of Presentation
      京都テルサ(京都府民総合交流プラザ)
    • Related Report
      2013 Annual Research Report

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Published: 2013-09-12   Modified: 2019-07-29  

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