On the mechanism of the shape elongation of embedded nanoparticles

被引：8

作者：

Amekura, H. ^{[1
]}

Kluth, P. ^{[2
]}

Mota-Santiago, P. ^{[2
]}

Sahlberg, I ^{[3
,4
]}

Jantunen, V ^{[3
,4
]}

Leino, A. A. ^{[3
,4
]}

Vazquez, H. ^{[3
,4
]}

Nordlund, K. ^{[3
,4
]}

Djurabekova, F. ^{[3
,4
]}

机构：

[1] Natl Inst Mat Sci NIMS, Tsukuba, Ibaraki, Japan

[2] Australian Natl Univ ANU, Res Sch Phys, Dept Elect Mat Engn, Canberra, ACT, Australia

[3] Univ Helsinki, Helsinki Inst Phys, Helsinki, Finland

[4] Univ Helsinki, Dept Phys, Helsinki, Finland

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2020年 / 475卷

基金：

澳大利亚研究理事会; 芬兰科学院;

关键词：

Shape elongation; Ion shaping; Nanoparticle; Swift heavy ion; Two-temperature molecular dynamics; ION IRRADIATION; TRACKS; DEFORMATION; SILICA;

D O I：

10.1016/j.nimb.2020.04.038

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The mechanism of the shape elongation of metal nanoparticles (NPs) in silica, which is induced under swift heavy ion irradiation, is discussed with comparing the two candidates: (i) the synergy between the ion hammering and the transient melting of NPs by the inelastic thermal spike and (ii) the thermal pressure and flow model. We show that three experimental results are inconsistent with (i). The latter is supported by two-temperature molecular dynamics simulations, which simulate not only the atomic motions but also the local electron temperatures. A remarkable correlation was observed between the temporal evolution of the silica density around the ion trajectory and that of the aspect ratio of the NP later than similar to 1 ps after the ion impact, while no correlation was observed earlier than similar to 1 ps, even under the assumption of the instantaneous energy deposition.

引用

页码：44 / 48

页数：5