Schwartzberg Adam M, Olson Tammy Y, Talley Chad E, Zhang Jin Z
Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA.
J Phys Chem B. 2006 Oct 12;110(40):19935-44. doi: 10.1021/jp062136a.
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.
通过牺牲性电置换钴纳米颗粒，合成了具有可调内径和外径的近单分散空心金纳米球（HGNs）。通过仔细控制粒径和壁厚，可以将表面等离子体带吸收峰调谐在550至820nm之间。通过分别同时改变硼氢化钠和柠檬酸钠（还原剂和封端剂）的浓度，可以调节钴颗粒的大小。通过仔细控制金盐的添加量，可以改变金壳的厚度。随着整体以及单个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潜力，特别是那些需要具有近红外吸收的纳米结构的应用。
