Brinson Bruce E, Lassiter J Britt, Levin Carly S, Bardhan Rizia, Mirin Nikolay, Halas Naomi J
Department of Electrical Engineering, Rice University, Houston, Texas 77005, USA.
Langmuir. 2008 Dec 16;24(24):14166-71. doi: 10.1021/la802049p.
The growth of a continuous, uniform Au layer on a dielectric nanoparticle is the critical step in the synthesis of nanoparticles such as nanoshells or nanorice, giving rise to their unique geometry-dependent plasmon resonant properties. Here, we report a novel, streamlined method for Au layer metallization on prepared nanoparticle surfaces using carbon monoxide as the reducing agent. This approach consistently yields plasmonic nanoparticles with highly regular shell layers and is immune to variations in precursor or reagent preparation. Single particle spectroscopy combined with scanning electron microscopy reveal that thinner, more uniform shell layers with correspondingly red-shifted optical resonances are achievable with this approach.
在介电纳米颗粒上生长连续、均匀的金层是合成纳米壳或纳米米等纳米颗粒的关键步骤，这赋予了它们独特的几何形状依赖的等离子体共振特性。在此，我们报告一种新颖、简化的方法，使用一氧化碳作为还原剂在制备好的纳米颗粒表面进行金层金属化。这种方法始终能产生具有高度规则壳层的等离子体纳米颗粒，并且不受前驱体或试剂制备变化的影响。单颗粒光谱与扫描电子显微镜相结合表明，通过这种方法可以实现更薄、更均匀的壳层以及相应红移的光学共振。
