Controlled shape modification of embedded Au nanoparticles by 3 MeV Au2+-ion irradiation

被引：11
|
作者：
Datta, D. P. [1 ,2 ]
Takeda, Y. [2 ]
Amekura, H. [2 ]
Sasase, M. [3 ]
Kishimoto, N. [4 ]
机构：
[1] Inst Phys, Bhubaneswar 751005, Odisha, India
[2] Natl Inst Mat Sci, Quantum Beam Unit, Tsukuba, Ibaraki 3050003, Japan
[3] Wakasa Wan Energy Res Ctr, Tsuruga, Fukui 9140192, Japan
[4] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
APPLIED SURFACE SCIENCE | 2014年 / 310卷
关键词：
Ion irradiation; Embedded metal nanoparticles; Shape modification; ION IRRADIATION; SIO2; GLASSES; SILICA;
D O I：
10.1016/j.apsusc.2014.03.121
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Shape modification of embedded Au nanoparticles by 3 MeV Au2+-ion irradiation has been studied by cross-sectional transmission electron microscopy (XTEM). The ion irradiation on spherical Au nanopartides shallowly-embedded in SiO2 caused a well-controlled transformation of shape to ellipsoidal. Satellite nanoparticles of smaller sizes were found to nucleate around the ellipsoids. Rapid growth of the ellipsoidal nanoparticles was observed as the applied fluence increased from 3 x 10(15) to 7 x 10(15) ions cm(-2). The XTEM study also revealed the crystallinity of the ellipsoids formed by MeV ion irradiation. Reduction in the surface plasmon resonance (SPR) peak intensity in the optical absorption spectrum indicates partial dissolution of the spherical nanoparticles by ion irradiation. We have thus obtained a unique near-surface structure of ellipsoidal nanoparticles. The results are discussed in terms of effects of ion energy deposition and inverse Ostwald ripening. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：164 / 168
页数：5
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