Changes in metal nanoparticle shape and size induced by swift heavy-ion irradiation

被引：48

作者：

Ridgway, M. C. ^{[1
]}

Kluth, P. ^{[1
]}

Giulian, R. ^{[1
]}

Sprouster, D. J. ^{[1
]}

Araujo, L. L. ^{[1
]}

Schnohr, C. S. ^{[1
]}

Llewellyn, D. J. ^{[1
]}

Byrne, A. P. ^{[2
,3
]}

Foran, G. J. ^{[4
]}

Cookson, D. J. ^{[5
]}

机构：

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

[2] Australian Natl Univ, Dept Nucl Phys, Res Sch Phys & Engn, Canberra, ACT, Australia

[3] Australian Natl Univ, Dept Phys, Res Sch Phys & Engn, Canberra, ACT, Australia

[4] Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia

[5] Australian Synchrotron, Clayton, Vic, Australia

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2009年 / 267卷 / 06期

基金：

美国国家科学基金会;

关键词：

Metal nanoparticles; Ion irradiation; Synchrotron radiation; NANOCRYSTALS; NANORODS; GOLD; SIO2;

D O I：

10.1016/j.nimb.2009.02.025

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Changes in the shape and size of Co, Pt and An nanoparticles induced by swift heavy-ion irradiation (SHII) have been characterized using a combination of transmission electron microscopy, small-angle X-ray scattering and X-ray absorption near-edge Structure. Elemental nanoparticles of diameters 2-15 nm were first formed in amorphous SiO2 by ion implantation and thermal annealing and then irradiated at room temperature with 27-185 MeV Au ions as a function of fluence. Spherical nanoparticles below a minimum diameter (4-7 nm) remained spherical under SHII but progressively decreased in size as a result of dissolution into the SiO2 matrix. Spherical nanoparticles above the minimum diameter threshold were transformed to elongated rods aligned with the ion beamdirection. The nanorod width saturated at an electronic energy deposition dependent value, progressively increasing from 4-6 to 7-10nm (at 518 keV/nm, respectively) while the nanorod length exhibited a broad distribution consistent with that of the unirradiated spherical nanoparticles. The threshold diameter for spherical nanoparticle elongation was comparable to the saturation value of nanorod width. We correlate this saturation value with the diameter of the molten track induced in amorphous SiO2 by SHII. In summary, changes in nanoparticle shape and size are governed to a large extent by the ion irradiation parameters. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：931 / 935

页数：5

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