Optical Property/Structure/Process Relationship for Gold Nanoparticles

金纳米颗粒的光学性质/结构/工艺关系

• 批准号: 0094773
• 负责人: Ian Suni
• 金额: $ 22.31万
• 依托单位: Clarkson University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-01 至 2004-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0094773&HistoricalAwards=false
• 关键词: Optical; Property; Structure; Process; Relationship

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.

提案标题：金纳米粒子的光学性质/结构/工艺关系提案编号：CTS-0094773主要研究者：Ian Suni机构：克拉克森大学本提案的目的是利用原子力显微镜、二次谐波发生（SHG）和紫外-可见消光光谱研究金粒子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从氟化氢溶液中电置换沉积到硅衬底上。 相对均匀尺寸的金属纳米颗粒的电沉积可以通过使用大的瞬态过电位来实现，使得瞬时成核发生。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。纳米颗粒生长的替代方法是施加高阴极电压瞬态作为成核冲击，随后在低过电位下进行颗粒生长，使得不发生进一步的成核。 光学研究涉及开发原位工具，用于研究薄膜沉积初始阶段的成核和颗粒生长。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。最近出现的金纳米粒子作为有效的氧化催化剂是一个领域，这项工作可能有相关性。 此外，这项工作可能会导致新的方法来快速表征金属纳米粒子的平均尺寸和结构在微米级的长度尺度。