Zhang Fengxiang, Srinivasan M P
Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117576, Singapore.
J Colloid Interface Sci. 2008 Mar 15;319(2):450-6. doi: 10.1016/j.jcis.2007.12.008. Epub 2007 Dec 14.
This work reports the fabrication and characterization of multilayered gold nanoparticle (AuNP) thin films on aminosilane functionalized substrates. The films are fabricated via layer-by-layer (LbL) assembly using as-synthesized, un-modified AuNPs and poly(allylamine hydrochloride) as the building blocks. While most literature reports that AuNP based LbL assemblies are constructed with a single interlayer binding force, this work shows that both coordination and electrostatic interaction are involved in the process of assembly based on X-ray photoelectron spectroscopic results. The stepwise film growth behavior is demonstrated by atomic force spectroscopy and UV-vis spectroscopy. It is found that the particles agglomerate with each other and form large clusters when the number of assembled layers increases.
这项工作报道了在氨基硅烷功能化基底上制备多层金纳米颗粒（AuNP）薄膜及其表征。这些薄膜是通过逐层（LbL）组装法制备的，使用合成的、未修饰的AuNP和聚（烯丙胺盐酸盐）作为构建单元。虽然大多数文献报道基于AuNP的LbL组装体是由单一的层间结合力构建的，但这项工作基于X射线光电子能谱结果表明，配位和静电相互作用都参与了组装过程。通过原子力光谱和紫外-可见光谱证明了薄膜的逐步生长行为。研究发现，当组装层数增加时，颗粒会相互聚集并形成大的聚集体。
