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。催化剂在避免不希望的副反应的同时选择所需的化学产品的能力是一个关键但困难的目标。在这个方向上做出有意义的贡献将对化学催化领域以及整个化学领域产生很大的影响。最近有人建议，当用低强度紫外线可见光照明（即来自太阳）时，被称为等离激元金属纳米颗粒的银和金颗粒可以有效地将能量沉积到特定的化学转化中。这与在每个可用反应中不可分犯的能量分布在金属上的传统，热驱动的化学反应相反。在这个项目中，密歇根大学的Suljo Linic博士正在对哪种物理性质控制等离激催化剂的能量流以及如何控制这些特性的理解。开发这些见解对于针对特定化学转化的选择性催化剂的目标设计至关重要。 Linic博士还从事广泛的教育活动，基于他的研究，以促进学生参与科学，技术，工程和数学（STEM）学科。这些活动包括接触高中和来自代表性不足的群体的本科生，以及较少的传统策略，旨在改善全球网络在吸引学生和公众的利用中。与化学催化计划的资助，Linic的化学催化计划是通过对多种多样的Metalsmosic proverment of Metalsmonic Flows -Nan nnan Nan Nan Nan Nan nnan n Nan n Nan n Nan n Nan n Nan n Nan nnan nnan nnan nnan nnan nnan nnan n Nan n nan nnan nnan nnan nnan nnan n an n n n an n n an nnan nnan nnan nnan nnan nnan nnan nnan nistic incement。他正在实现这样一个概念，即光能可用于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来选择性地激活特定的化学转化。他正在检验以下假设：该目标可以通过具有相对较大的等离激元（AG或AU）核（NM的10s）的多组分等离激元纳米结构来实现，旨在收获谐振光能，周围是由薄薄的壳（〜1 nm）包围，该壳（〜1 nm范围）的不同材料的不同材料旨在驱动特定的化学转化，旨在驱动特定的化学转化。他假设这些结构将允许对纳米级的共振能量完全控制，从而有效地将其汇入所需的化学转化中。他正在采用一系列特征技术，包括纳米结构几何结构的原子表征，分析多组分等离子材料的电子和光学特性以及振动和反应光谱。这项奖项反映了NSF的法定任务，并通过评估了基金会的范围，并通过基金会的范围进行了评估，并经过评估。