IBM Research-Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland.
Langmuir. 2011 May 17;27(10):6305-10. doi: 10.1021/la2001128. Epub 2011 Apr 14.
Capillary assembly was explored for the precise placement of 25 nm × 70 nm colloidal gold nanorods on prestructured poly(dimethylsiloxane) template surfaces. The concentration of nanorods and cationic surfactant cetyltrimethylammonium bromide (CTAB), the template wettability, and most critically the convective transport of the dispersed nanorods were tuned to study their effect on the resulting assembly yield. It is shown that gold nanorods can be placed into arrayed 120-nm diameter holes, achieving assembly yields as high as 95% when the local concentration of nanorods at the receding contact line is sufficiently high. Regular arrays of gold nanorods have several benefits over randomly deposited nanorod arrangements. Each assembled nanorod resides at a precisely defined location and can easily be found for subsequent characterization or direct utilization in a device. The former is illustrated by collecting scattering spectra from single nanorods and nanorod dimers, followed by subsequent SEM characterization without the need for intricate registration schemes.
毛细管组装技术被探索用于将 25nm×70nm 胶体金纳米棒精确地放置在预先结构化的聚二甲基硅氧烷模板表面上。通过调整纳米棒和阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）的浓度、模板润湿性，以及最重要的是分散纳米棒的对流传输，研究了它们对组装产率的影响。结果表明，金纳米棒可以被放置在直径为 120nm 的孔中排列，当退离接触线处的纳米棒局部浓度足够高时，组装产率高达 95%。与随机沉积的纳米棒排列相比，规则排列的金纳米棒具有多个优点。每个组装的纳米棒都位于精确定义的位置，可以轻松找到用于后续特征化或直接在设备中使用。通过从单个纳米棒和纳米棒二聚体收集散射光谱，并在无需复杂的注册方案的情况下进行后续的 SEM 特征化，说明了这一点。
