Synthesis, characterization, and tunable optical properties of hollow gold nanospheres
Synthesis, characterization, and tunable optical properties of hollow gold nanospheres
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DOI：
10.1021/jp062136a
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发表时间：
2006-10-12
影响因子：
3.3
通讯作者：
Zhang, Jin Z.
中科院分区：
文献类型：
--
作者：
Schwartzberg, Adam M.;Olson, Tammy Y.;Zhang, Jin Z.
采用牺牲电替换钴纳米粒子的方法合成了内径和外径可调的近单分散中空金纳米球。通过仔细控制颗粒大小和壁厚，可以将表面等离子体带吸收峰调整在550 ~ 820 nm之间。通过同时改变还原剂硼氢化钠和封盖剂柠檬酸钠的浓度，可以调节钴的粒径。通过仔细控制金盐的加入，可以改变金壳的厚度。随着整体和单个HGN表面增强拉曼散射的成功演示，这些HGN在化学和生物传感应用中显示出巨大的潜力，特别是那些需要具有近红外吸收的纳米结构。
Nearly monodisperse hollow gold nanospheres (HGNs) with tunable interior and exterior diameters have been synthesized by sacrificial galvanic replacement of cobalt nanoparticles. It is possible to tune the peak of the surface plasmon band absorption between 550 and 820 nm by carefully controlling particle size and wall thickness. Cobalt particle size is tunable by simultaneously changing the concentration of sodium borohydride and sodium citrate, the reducing and capping agent, respectively. The thickness of the gold shell can be varied by carefully controlling the addition of gold salt. With successful demonstration of ensemble as well as single HGN surface-enhanced Raman scattering, these HGNs have shown great potential for chemical and biological sensing applications, especially those requiring nanostructures with near-IR absorption.