Formation of nanoporous structure on gold nanoparticle by dealloying

2014 Fiscal Year Final Research Report

• Project/Area Number: 25886002
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Nanomaterials chemistry
• Research Institution: Tohoku 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
• 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

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.

Free Research Field

ナノマテリアル