Shape elongation of embedded metal nanoparticles induced by swift heavy ion irradiation

2016 Fiscal Year Final Research Report

• Project/Area Number: 26390032
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials engineering
• Research Institution: National Institute for Materials Science
• Principal Investigator: AMEKURA Hiroshi 国立研究開発法人物質・材料研究機構, 先端材料解析研究拠点, 主席研究員 (00354358)
• Co-Investigator(Renkei-kenkyūsha): ISHIKAWA Norito 日本原子力研究開発機構, 原子力基礎工学研究センター, 研究主幹 (90354828) ; OKUBO Nariaki 日本原子力研究開発機構, 原子力エネルギー基盤連携センター, 副主任研究員 (60391330)
• Research Collaborator: AVASTHI Devesh. 元Inter-University Accelerator Centre ; KHAN Saif Inter-University Accelerator Centre, 研究員 ; GOMEZ Daniel CSIRO, 研究員
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 高速重イオン / 金属ナノ粒子 / 照射誘起楕円変形 / Ion Beam Shaping / プラズモニクス / イオンビーム / ナノロッド / 楕円ナノ粒子

Outline of Final Research Achievements

It has been reported that spherical metal nanoparticles (NPs) embedded in amorphous solid, such as silica, show shape deformation to prolate spheroids and finally to nano-rods under irradiation with swift heavy ions, i.e., heavy ions with higher energy than a few tens of MeV. While the majority of scientists still assume the deformation mechanism to the ion-hammering effect, we have pointed out an inconsistency between the fluence dependence predicted from the hammering and our experimental results. In this study, we have further pointed out subtle but certain inconsistency of the hammering mechanism in the depth dependence and in the irradiation temperature dependence of the NP deformation. In order to enrich the understanding, other studies concerning this phenomenon were carried out. To the best of our knowledge, we have firstly observed that the same phenomenon is induced under MeV C60 cluster ion irradiation.

Free Research Field

イオンビームナノ工学