Unique Electrochemistry and Optical Properties of Metal Nanoparticle Assemblies

金属纳米颗粒组件独特的电化学和光学特性

• 批准号: 1611170
• 负责人: Francis Zamborini
• 金额: $ 43.86万
• 依托单位: University of Louisville Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1611170&HistoricalAwards=false
• 关键词: Unique; Electrochemistry; Optical; Properties; Metal

In this project funded by the Macromolecular, Supramolecular, and Nanochemistry program of the Division of Chemistry, Professor Francis P. Zamborini of the University of Louisville and his team study the oxidation of small gold nanoparticles using a combination of chemical characterization techniques. Nanoparticles are tiny particles that contain thousands of atoms. While they are much larger than chemical molecules, which contain only a few atoms, they are still much smaller than solid materials that are large enough to see with the naked eye, containing trillions of atoms. Nanoscale materials are unique because they have sizes intermediate between molecules and solids, but sometimes have properties not easily predicted by averaging the two size extremes. The aim of the research is to understand the unusual electrochemical reactivity of metal nanoparticles smaller than 2 nm and of alloy nanostructure composition, arrangement, and reactivity. The aim is to develop new analytical tools for metal nanostructures, and also uncover unique properties, reactivity, and applications. The project impacts the education of students at all levels through research training and wider incorporation of nanotechnology into the undergraduate curriculum. A yearly one-day symposium highlights research by women of all ages from middle school up to academic and industrial professionals. The goal of this symposium is to inspire more young female students to pursue a long term career in science. These activities impact the education and economy in Kentucky and beyond through broad dissemination. This project aims to correlate the specific size with the oxidation potential for nanospheres below 2 nm, which show unusual electrochemical reactivity that change dramatically as a function of size. The project also addresses the atomic arrangement of metals in two-component alloy nanospheres by determining electrochemical oxidation behavior. This method allows the sensitive detection of transformations that occur during heating or catalytic reactions. Another focus of the project is the size-selective electrochemical deposition of negatively-charged gold nanospheres onto electrodes. This process has potential for the design of highly active supported electrocatalysts. The research team also uses gold nanoplate-nanosphere dimer structures as a platform for sensitive molecular detection by surface enhanced Raman spectroscopy (SERS). Images of the structures are directly correlated to the SERS signal. A unique trimer structure is used to study catalytic reactions on non-SERS active metals. The well-controlled nanoplate-nanosphere dimer and trimer assemblies aid in better understanding and controlling SERS detection for the study of reactions at the single molecule level.

在该项目中由大分子，超分子和纳米化学分部资助，路易斯维尔大学的弗朗西斯·P·桑伯里尼教授和他的团队研究了使用化学表征技术组合对小金纳米颗粒进行氧化的氧化。纳米颗粒是包含数千原子的微小颗粒。尽管它们比仅包含几个原子的化学分子大得多，但它们仍然比实心材料小得多，这些材料足够大，可以用肉眼看，其中包含数万亿个原子。纳米级材料是独一无二的，因为它们具有分子和固体之间的大小中间的大小，但有时通过平均两个尺寸的极端物质不容易预测特性。该研究的目的是了解小于2 nm的金属纳米颗粒和合金纳米结构组成，排列和反应性的异常电化学反应性。目的是为金属纳米结构开发新的分析工具，并发现独特的属性，反应性和应用。该项目通过研究培训和将纳米技术的更广泛纳入本科课程影响各级学生的教育。每年的一日研讨会强调了从中学到学术和工业专业人员的所有年龄段的妇女的研究。该研讨会的目的是激发更多的年轻女学生从事科学的长期职业。这些活动会通过广泛的传播影响肯塔基州及以后的教育和经济。该项目旨在将特定尺寸与低于2 nm的纳米球的氧化潜力相关联，该纳米球的氧化潜力显示出异常的电化学反应性，这些反应性随着大小的函数而发生巨大变化。该项目还通过确定电化学氧化行为来解决两个组分合金纳米球中金属的原子布置。该方法允许对加热或催化反应过程中发生的转化敏感检测。该项目的另一个重点是尺寸选择性的电化学沉积，将负电荷的金纳米球纳入电极。该过程具有高度活跃的受支持的电催化剂的设计。研究团队还使用金纳米板纳米层二聚体结构作为通过表面增强的拉曼光谱（SER）敏感分子检测的平台。结构的图像与SERS信号直接相关。独特的三聚体结构用于研究非s活性金属的催化反应。控制良好的纳米板纳米层二聚体和三聚体组件有助于更好地理解和控制SERS检测，以研究单分子水平的反应。