Structural organization of gold nanoparticles onto the ITO surface and its optical properties as a function of ensemble size
Structural organization of gold nanoparticles onto the ITO surface and its optical properties as a function of ensemble size
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DOI：
10.1021/la7039042
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发表时间：
2008-04-15
期刊：
影响因子：
3.9
通讯作者：
Sugimura, Hiroyuki
中科院分区：
文献类型：
--
作者：
Khatri, Orn P.;Murase, Kuniaki;Sugimura, Hiroyuki
柠檬酸盐稳定的金纳米粒子（AuNPs）的自组装到光学透明的氧化铟锡（ITO）表面上，然后使用十二烷基乙醇作为表面活性剂的中和这些颗粒已被证明。X射线光电子能谱（XPS）的研究表明，柠檬酸根离子从固定的金纳米粒子，这推进了金纳米粒子和APS（氨基封端的单层）功能化的ITO表面之间的静电吸引力的稀释部分去除。所得AuNP在一定程度上恢复其移动性并形成小的集合体。XPS研究证实，由于中和作用，一些固定化的金纳米颗粒从表面完全除去。通过连续循环的金纳米颗粒的固定化和中和来操纵粒子间距离和集合的大小。受控的纳米结构制造进展，这导致金纳米颗粒的二维横向生长，提供了一种方法，用于系统地移动的表面等离子体共振带的基础上增加的等离子体耦合之间的紧密放置的金纳米颗粒的合奏。移动的幅度随着系综的大小而增大。这种操纵的化学策略提供了一种方便而简单的方法来调整纳米材料的光学性质。
Self-assembly of citrate-stabilized gold nanoparticles (AuNPs) onto an optically transparent indium tin oxide (ITO) surface followed by neutralization of these particles using dodecanethiol as a surfactant have been demonstrated. X-ray photoelectron spectroscopic (XPS) studies revealed the partial removal of citrate ions from the immobilized AuNPs, which advances the dilution of electrostatic attraction between AuNPs and the APS (amino-terminated monolayer)functionalized ITO surface. The resultant AuNPs restore their mobility to some extent and form small ensembles. Some of the immobilized AuNPs were completely removed from the surface due to neutralization, as confirmed by XPS studies. Interparticle distance and size of ensembles were manipulated by consecutive cycles of immobilization and neutralization of AuNPs. Controlled nanostructural fabrication progression, which leads to two-dimensional lateral growth of AuNPs, provides a method for systematically shifting the surface plasmon resonance band based on the increase in plasmon coupling among the closely placed AuNPs of an ensemble. The magnitude of shift increases with the size of ensemble. This manipulated chemical strategy offers a convenient and simple method to tune the optical properties of materials on a nanoscale.