CAREER: Probing Chemistry of Surface-Supported Nanostructures at the Angstrom-Scale

职业：埃级表面支撑纳米结构的化学探索

• 批准号: 1944796
• 负责人: Nan Jiang
• 金额: $ 68.61万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-05-01 至 2025-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1944796&HistoricalAwards=false
• 关键词: CAREER; Probing; Chemistry; Surface; Supported

Scanning tunneling microscopy (STM) technology was invented nearly 40 years ago. STM produced the first images of single atoms on a surface. Around the same time, it was discovered that light signals emitted from a vibrating molecule could be amplified more than a million times if the molecule was on the tip of a nanometer-scale metal tip. In this project funded by the Chemical Structure Dynamics and Mechanisms (CSDM-A) program of the Chemistry Division, Professor Nan Jiang of the Department of Chemistry at the University of Illinois at Chicago is developing a state-of-the-art technique that combines scanning tunneling microscopy (STM) with tip-enhanced Raman spectroscopy (TERS) to study bond stretching in an individual molecule with angstrom-scale spatial resolution (an angstrom is one hundred millionths of a centimeter). Using his TERS technique, Professor Jiang and his students study how individual molecules align relative to each other on surfaces. The Jiang research group seeks to uncover the details of how single molecules interact with surfaces. This research may ultimately provide fundamental knowledge that will able the control of surface-supported molecular structures and reactions. As part of this CAREER project, Professor Jiang and his group are bringing the excitement of chemistry research opportunities to community college and local high school students by offering them hands-on research experience in physical chemistry at the single molecule level. Dr. Jiang improves the participation of undergraduate students in experimental chemistry research by establishing a One-Week Physical Chemistry Workshop at UIC. In this workshop, Chicago City Colleges students from diverse backgrounds are exposed to scientific career paths. Dr. Jiang's group provides handheld Raman equipment to community college students in the Chicago area with online training materials and data analysis procedures. This sharing of equipment and data enriches the general chemistry laboratory experience.This project focuses on interrogating the mechanisms of forming and breaking chemical bonds at the angstrom-scale in various chemical environments using novel approaches. The combination of STM imaging with the detailed chemical information provided by Raman spectroscopy allows the interactions between organic adsorbates and specific binding sites on solid surfaces to be probed with spatial and spectroscopic resolution. Furthermore, Raman one-dimensional (1D) line profiles and two-dimensional (2D) mapping achieved with angstrom-scale spatial resolution provide the location of these vibrational modes on the surface, and hence, define the interactions between these molecules and specific binding sites. Detailed mechanistic studies of the elementary steps of surface-supported structure formation are expected to lead to improvements in designing new atom- and energy-efficient materials and molecular assemblies with tailored chemical properties. The students engaged in this research and education project gain valuable experience in both scanning microscopy and optical spectroscopy, as well as quantum mechanics theory calculations which aid in the interpretation of experimental data.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.

扫描隧道显微镜 (STM) 技术发明已有近 40 年历史。 STM 产生了表面上单个原子的第一张图像。大约在同一时间，人们发现，如果分子位于纳米级金属尖端的尖端，则振动分子发出的光信号可以被放大一百万倍以上。 在这个由化学部化学结构动力学和机理（CSDM-A）项目资助的项目中，伊利诺伊大学芝加哥分校化学系的 Nan Jiang 教授正在开发一种最先进的技术，该技术结合了扫描隧道显微镜 (STM) 与尖端增强拉曼光谱 (TERS) 相结合，以埃级空间分辨率（埃为百万分之一厘米）研究单个分子中的键拉伸。姜教授和他的学生利用他的 TERS 技术研究了单个分子如何在表面上相互排列。江研究小组试图揭示单分子如何与表面相互作用的细节。 这项研究最终可能提供能够控制表面支持的分子结构和反应的基础知识。作为这个职业项目的一部分，江教授和他的团队通过为社区大学和当地高中生提供单分子水平物理化学的实践研究经验，为他们带来令人兴奋的化学研究机会。姜博士在UIC设立了为期一周的物理化学研讨会，提高本科生对实验化学研究的参与度。在本次研讨会上，来自不同背景的芝加哥城市学院的学生将接触到科学的职业道路。 江博士的团队为芝加哥地区的社区学院学生提供手持式拉曼设备以及在线培训材料和数据分析程序。这种设备和数据的共享丰富了一般化学实验室的经验。该项目的重点是使用新方法探究各种化学环境中埃级化学键形成和断裂的机制。 STM 成像与拉曼光谱提供的详细化学信息相结合，允许以空间和光谱分辨率探测有机吸附物与固体表面上特定结合位点之间的相互作用。此外，以埃级空间分辨率实现的拉曼一维 (1D) 线剖面和二维 (2D) 映射提供了这些振动模式在表面上的位置，从而定义了这些分子与特定结合位点之间的相互作用。对表面支撑结构形成基本步骤的详细机理研究预计将有助于改进设计具有定制化学性质的新型原子和节能材料以及分子组件。参与这项研究和教育项目的学生在扫描显微镜和光谱学以及量子力学理论计算方面获得了宝贵的经验，这有助于解释实验数据。该奖项反映了 NSF 的法定使命，并被认为值得通过以下方式支持：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。

项目成果

On-Surface Synthesis and Molecular Engineering of Carbon-Based Nanoarchitectures

碳基纳米结构的表面合成和分子工程

• DOI: 10.1021/acsnano.0c08148
• 发表时间: 2021-03
• 期刊: ACS Nano
• 影响因子: 17.1
• 作者: Li, Linfei;Mahapatra, Sayantan;Liu, Dairong;Lu, Zhongyi;Jiang, Nan
• 通讯作者: Jiang, Nan

Chemical Characterization of a Three-Dimensional Double-Decker Molecule on a Surface via Scanning-Tunneling-Microscopy-Based Tip-Enhanced Raman Spectroscopy

通过基于扫描隧道显微镜的尖端增强拉曼光谱对表面上的三维双层分子进行化学表征

• DOI: 10.1021/acs.jpcc.2c01434
• 发表时间: 2022-05
• 期刊: The Journal of Physical Chemistry C
• 作者: Mahapatra, Sayantan;Schultz, Jeremy F.;Li, Linfei;Zhang, Xu;Jiang, Nan
• 通讯作者: Jiang, Nan

Proximity and single-molecule energetics

邻近和单分子能量学

• DOI: 10.1126/science.abj5860
• 发表时间: 2021-07-23
• 期刊: Science
• 影响因子: 56.9
• 作者: Linfei Li;Nan Jiang
• 通讯作者: Nan Jiang

On-surface formation of metal–organic coordination networks with C⋯Ag⋯C and C=O⋯Ag interactions assisted by precursor self-assembly

前驱体自组装辅助下 C−Ag−C 和 C=O−Ag 相互作用在表面形成金属−有机配位网络

• DOI: 10.1063/5.0038559
• 发表时间: 2021-01
• 期刊: The Journal of Chemical Physics
• 作者: Schultz, Jeremy F.;Yang, Bing;Jiang, Nan
• 通讯作者: Jiang, Nan

Parabolic Potential Surfaces Localize Charge Carriers in Nonblinking Long-Lifetime “Giant” Colloidal Quantum Dots

抛物线势面将电荷载流子定位在不闪烁的长寿命“巨型”胶体量子点中

• DOI: 10.1021/acs.nanolett.2c03563
• 发表时间: 2022-12
• 期刊: Nano Letters
• 影响因子: 10.8
• 作者: Pálmai, Marcell;Beckwith, Joseph S.;Emerson, Nyssa T.;Zhao, Tian;Kim, Eun Byoel;Yin, Shuhui;Parajuli, Prakash;Tomczak, Kyle;Wang, Kai;Sapkota, Bibash;et al
• 通讯作者: et al