Tadpole-shaped Au nano-particles fabricated by laser fragmentation of Au nano-spheres in liquid  

作　　者：张冲 马佳琪 朱东东 刘良 王大猛 刘向东 陈明 

机构地区：[1]School of Physics, Shandong University

出　　处：《Chinese Optics Letters》2016年第8期63-66,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11575102,11105085,and 11375108);the Fundamental Research Funds of Shandong University,China(No.2015JC007)

摘　　要：Tadpole-shaped Au nano-particles with controllable tails are successfully fabricated by simply using laser fragmentation of separated Au nano-spheres in liquid. The optimum laser power densities（1.5–3 GW∕cm-2） can enable part of the individual Au nano-sphere to be re-melted, released, and ultra-rapidly recondensed/crystallized on the outside of the original region. We find that the length of the tail in a tadpole-shaped Au nano-particle significantly increases from about 10 to 25 nm by increasing the laser power density. Benefiting from the unique structural features, the localized surface plasmon resonance（LSPR） absorption spectra of the tadpole-shaped Au nano-particles become broader by increasing the tail length. Moreover, the LSPR absorption band also exhibits a noticeable red shift from about 520 to 650 nm. Our results provide a convenient and valuable strategy to fabricated novel anisotropic-shaped nano-structures with fascinating properties.Tadpole-shaped Au nano-particles with controllable tails are successfully fabricated by simply using laser fragmentation of separated Au nano-spheres in liquid. The optimum laser power densities（1.5–3 GW∕cm-2） can enable part of the individual Au nano-sphere to be re-melted, released, and ultra-rapidly recondensed/crystallized on the outside of the original region. We find that the length of the tail in a tadpole-shaped Au nano-particle significantly increases from about 10 to 25 nm by increasing the laser power density. Benefiting from the unique structural features, the localized surface plasmon resonance（LSPR） absorption spectra of the tadpole-shaped Au nano-particles become broader by increasing the tail length. Moreover, the LSPR absorption band also exhibits a noticeable red shift from about 520 to 650 nm. Our results provide a convenient and valuable strategy to fabricated novel anisotropic-shaped nano-structures with fascinating properties.

关 键 词：shaped fragmentation spheres fascinating controllable anisotropic enable crystallized length fabrication 

分 类 号：TB383.1[一般工业技术—材料科学与工程]