Optical Property/Structure/Process Relationship for Gold Nanoparticles

提案标题：金纳米颗粒的光学性质/结构/过程关系提案编号：CTS-0094773 首席研究员：Ian Suni 机构：克拉克森大学该提案的目的是使用原子力显微镜、二次谐波发生 (SHG) 和紫外可见消光光谱研究金颗粒在氢封端硅表面上的电沉积。金纳米颗粒将通过电沉积和氟化氢溶液的电位移沉积到硅基底上。 通过使用大的瞬态过电势，从而发生瞬时成核，可以实现尺寸相对均匀的金属纳米颗粒的电沉积。纳米颗粒的尺寸可以通过调节成核瞬态的持续时间来控制。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撞击，然后在低过电势下进行颗粒生长，从而不会发生进一步的成核。 光学研究涉及开发用于研究薄膜沉积初始阶段的成核和颗粒生长的原位工具。金纳米颗粒具有独特的光学和催化特性，可能会带来新的应用。最近出现的金纳米粒子作为有效的氧化催化剂是这项工作可能具有相关性的领域。 此外，这项工作可能会带来新的方法来快速表征微米级长度尺度上金属纳米颗粒的平均尺寸和结构。

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.