Controlled shape modification of embedded Au nanoparticles by 3 MeV Au2+-ion irradiation
Controlled shape modification of embedded Au nanoparticles by 3 MeV Au2+-ion irradiation
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DOI：
10.1016/j.apsusc.2014.03.121
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发表时间：
2014-08
影响因子：
6.7
通讯作者：
D. Datta;Y. Takeda;H. Amekura;M. Sasase;N. Kishimoto
中科院分区：
文献类型：
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作者：
D. Datta;Y. Takeda;H. Amekura;M. Sasase;N. Kishimoto
用截面透射电子显微镜（XTEM）研究了3 MeV Au ~（2+）离子辐照对嵌入式Au纳米粒子的形貌修饰。离子辐照浅埋于SiO2中的球形Au纳米颗粒导致了形状向椭球形的良好控制的转变。较小尺寸的卫星纳米粒子被发现在椭球体周围成核。当施加的能量密度从3 × 1015 ions cm − 2增加到7 × 1015 ions cm−2时，观察到椭圆形纳米颗粒的快速生长。XTEM研究还揭示了由MeV离子辐照形成的椭球体的结晶度。光学吸收光谱中的表面等离子体共振（SPR）峰强度的降低表明通过离子照射球形纳米颗粒的部分溶解。因此，我们得到了一个独特的近表面结构的椭球形纳米粒子。结果进行了讨论的离子能量沉积和逆奥斯特瓦尔德熟化的影响。
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 nanoparticles shallowly-embedded in SiO2caused 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 × 1015to 7 × 1015ions 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.