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Controlling the energy flow in multi-component plasmonic structures for selective catalysis

控制多组分等离子体结构中的能量流以实现选择性催化

基本信息

批准号：
1800197
负责人：
Suljo Linic
金额：
$ 44.68万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1800197&HistoricalAwards=false
关键词：
Controlling energy flow multi component

项目摘要

Catalysts are materials that can activate a chemical transformation. The ability of catalysts to select a desired chemical product while avoiding undesired side reactions is a critical, but difficult objective. Making meaningful contributions in this direction would have a large impact on the field of chemical catalysis and across the field of chemistry generally. It was suggested recently that when illuminated with low intensity ultraviolet-visible light (i.e., from the Sun), small particles of silver and gold known as plasmonic metal nanoparticles can efficiently deposit energy into specific chemical transformations. This is in contrast to conventional, thermally-driven chemical reactions on metals where energy is indiscriminately distributed among every available reaction. In this project, Dr. Suljo Linic of the University of Michigan is developing an understanding of which physical properties govern the energy flow in plasmonic catalysts and how to control these properties. Developing these insights is critical for a targeted design of selective catalysts for specific chemical transformations. Dr. Linic is also engaged in a wide range of educational activities that build upon his research to promote engagement of students in science, technology, engineering and mathematics (STEM) disciplines. These activities include reaching out to high school and undergraduate students from underrepresented groups, as well as less conventional strategies aimed at improving the utilization of the World Wide Web in reaching students and the general public.With funding from the Chemical Catalysis Program of the Chemistry Division, Dr. Linic is developing a fundamental understanding of how electromagnetic energy flows through multicomponent plasmonic metal nanostructures. He is working on realizing the concept that light energy can be used to selectively activate specific chemical transformations by designing and controlling optical and electronic properties of multimetallic plasmonic nanostructures. He is testing the hypothesis that this objective can be accomplished by multicomponent plasmonic nanostructures with a relatively large plasmonic (Ag or Au) core (10s of nm), designed to harvest the resonant light energy, surrounded by a thin shell (~1 nm range) of a different material designed to drive specific chemical transformations using the harvested energy. He postulates that these structures would allow for complete control over the resonant energy flow at the nanoscale, funneling it efficiently into desired chemical transformations. He is employing a slate of characterization techniques including atomistic characterization of the geometric structure of the nanostructures, analysis of electronic and optical properties of the multicomponent plasmonic materials as well as vibrational and reaction spectroscopies.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

催化剂是可以激活化学转化的材料。催化剂选择所需化学产物同时避免不希望的副反应的能力是关键但困难的目标。在这个方向上做出有意义的贡献将对化学催化领域和整个化学领域产生重大影响。最近有人提出，当用低强度紫外-可见光照射时（即，来自太阳），被称为等离子体金属纳米颗粒的银和金的小颗粒可以有效地将能量存款到特定的化学转化中。这与金属上的传统热驱动化学反应形成对比，其中能量不加区别地分布在每个可用反应中。在这个项目中，密歇根大学的Suljo Linic博士正在研究哪些物理特性控制等离子体催化剂中的能量流以及如何控制这些特性。开发这些见解对于针对特定化学转化的选择性催化剂的有针对性的设计至关重要。Linic博士还从事广泛的教育活动，这些活动以他的研究为基础，促进学生参与科学，技术，工程和数学（STEM）学科。这些活动包括接触到高中和本科生从代表性不足的群体，以及不太传统的战略，旨在提高利用万维网在达到学生和公众。从化学部的化学催化计划的资金，博士Linic正在开发一个电磁能量如何通过多组分等离子体金属纳米结构流动的基本理解。他致力于实现这样一个概念，即通过设计和控制多金属等离子体纳米结构的光学和电子特性，光能可用于选择性地激活特定的化学转化。他正在测试一个假设，即这个目标可以通过具有相对较大的等离子体（Ag或Au）核心（10 nm）的多组分等离子体纳米结构来实现，设计用于收集共振光能，由不同材料的薄壳（约1 nm范围）包围，设计用于使用收集的能量驱动特定的化学转化。他假设这些结构将允许在纳米尺度上完全控制共振能量流，有效地将其转化为所需的化学转化。他采用了一系列表征技术，包括纳米结构几何结构的原子表征，多组分等离子体材料的电子和光学特性分析以及振动和反应光谱。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。