Optical Property/Structure/Process Relationship for Gold Nanoparticles

提案标题：金纳米颗粒的光学性质/结构/工艺关系提案编号：CTS-0094773首席研究员：伊恩·苏尼研究所：克拉克森大学本提案的目的是利用原子力显微镜、二次谐波产生(SHG)和紫外可见消光光谱研究金颗粒在氢终止的硅表面上的电沉积。金纳米粒子将通过电沉积和电偶置换从氟化氢溶液中沉积到硅衬底上。通过使用较大的瞬时过电位，可以实现相对均匀尺寸的金属纳米颗粒的电沉积，从而发生瞬时成核。纳米颗粒的大小可以通过调节成核瞬变的持续时间来控制。纳米颗粒生长的另一种方法是施加高阴极电压瞬变作为成核打击，然后在低过电位下颗粒生长，从而不会发生进一步的成核。光学研究包括开发原位工具，用于研究薄膜沉积初期的成核和颗粒生长。金纳米粒子具有独特的光学和催化性能，可能会导致新的应用。最近出现的金纳米颗粒作为有效的氧化催化剂是这项工作可能有意义的一个领域。此外，这项工作可能导致新的方法，以快速表征平均尺寸和结构的金属纳米颗粒在微米级的长度尺度。

Proposal Title: Optical Property/Structure/Process Relationship for Gold NanoparticlesProposal Number: CTS-0094773Principal Investigator: Ian SuniInstitution: Clarkson UniversityThe objective of this proposal is to investigate the electrodeposition of gold particles onto hydrogen terminated silicon surfaces using atomic force microscopy, second harmonic generation (SHG), and UV-visible extinction spectroscopy. Gold nanoparticles will be deposited onto silicon substrates by both electrodeposition and by galvanic displacement from hydrogen fluoride solutions. The electrodeposition of metal nanoparticles of a relatively uniform size can be accomplished by using a large transient overpotential so that instantaneous nucleation occurs. Nanoparticle size can be controlled by regulating the duration of the nucleation transient. An alternative method of nanoparticle growth is to apply a highly cathodic voltage transient as a nucleation strike, followed by particle growth at a low overpotential so that further nucleation does not occur. The optical studies involve development of in situ tools for studying nucleation and particle growth during the initial stages of thin film deposition. Gold nanoparticles have unique optical and catalytic properties that might lead to novel applications. The recent emergence of gold nanoparticles as effective oxidation catalysts is an area where this work may have relevance. In addition, this work may lead to novel methods to rapidly characterize the average size and structure of metal nanoparticles over micron-sized length scales.