Expanding the Capabilities of SERS via Electronic Raman Spectroscopy

通过电子拉曼光谱扩展 SERS 的功能

• 批准号: 2108288
• 负责人: Simon North
• 金额: $ 40.5万
• 依托单位: Texas A&M University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108288&HistoricalAwards=false
• 关键词: Expanding; Capabilities; SERS; via; Electronic

With support from the Chemical Measurement and Imaging (CMI) Program in the Division of Chemistry, Matthew Sheldon and his group at Texas A&M University are learning how to use a specific type of molecular sensor to obtain new information about the changes in chemical systems when they interact with light at a metal surface; namely, surface enhanced Raman scattering (SERS). This information is important for understanding how light from the sun can be converted into other forms of energy, such as chemical fuels. The molecular sensors are based on metal surfaces that are precisely structured at the nanometer scale. The reflection of light by these metal surfaces is strongly modified when molecules are on the sensor surface in a way that provides unique, identifying information about the molecules. The research team is examining a background signal caused by the reflection of light from the surface. This background signal is often ignored, but may provide new information about the transfer of energy into or out of molecules at the surface when irradiated with light, as well as additional information about the identity of the molecules. The project will provide support for graduate and undergraduate research students working in the Sheldon laboratory, and the team will work to recruit first-generation college students from underrepresented groups starting in their freshman year.In this work, Matthew T. Sheldon and his group are developing spectroscopic techniques to understand the photochemical behavior of metal substrates that are used for molecular sensing via surface enhanced Raman scattering (SERS). SERS spectroscopy typically measures the vibrational spectrum of a molecule, but the electronic Raman (eR) response of the metal SERS substrate also gives a strong “background” signal that has traditionally been ignored. The eR signal is characteristic of the energy distribution of electrons in the metal and can provide additional, unique chemical insights compared with the molecular SERS signal. This research by the Sheldon group examines how the eR signal can give detailed spectroscopic insights into the dynamics of electron excitation and charge transfer, even when there may be limited or ambiguous molecular signals (e.g. no Raman-active species). The experiments will provide a foundation for SERS methodologies that can provide quantitative insight into photochemistry and photocatalysis during low fluence, continuous wave (CW) illumination that is similar to the conditions that are relevant for solar energy conversion.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.

在化学测量与成像（CMI）项目的支持下，德克萨斯农工大学的Matthew Sheldon和他的团队正在学习如何使用一种特殊类型的分子传感器来获取化学系统与金属表面的光相互作用时变化的新信息。即表面增强拉曼散射（SERS）。这一信息对于理解太阳光如何转化为其他形式的能量（如化学燃料）非常重要。分子传感器是基于金属表面，在纳米尺度精确结构。当分子在传感器表面上时，这些金属表面对光的反射会发生强烈的变化，从而提供有关分子的独特识别信息。研究小组正在检查由表面光反射引起的背景信号。这种背景信号通常被忽略，但它可以提供光照射时表面分子的能量转移的新信息，以及关于分子身份的附加信息。该项目将为在谢尔登实验室工作的研究生和本科生提供支持，该团队将从大一开始从代表性不足的群体中招募第一代大学生。在这项工作中，Matthew T. Sheldon和他的团队正在开发光谱技术，以了解通过表面增强拉曼散射（SERS）用于分子传感的金属衬底的光化学行为。SERS光谱通常测量分子的振动谱，但金属SERS衬底的电子拉曼（eR）响应也会产生传统上被忽略的强“背景”信号。eR信号是金属中电子能量分布的特征，与分子SERS信号相比，可以提供额外的、独特的化学见解。Sheldon小组的这项研究研究了eR信号如何提供详细的光谱洞察电子激发和电荷转移的动力学，即使可能存在有限或模糊的分子信号（例如，没有拉曼活性物质）。该实验将为SERS方法提供基础，该方法可以在低通量连续波（CW）照明下定量了解光化学和光催化作用，类似于与太阳能转换相关的条件。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Super-Planckian emission cannot really be ‘thermal’

• DOI: 10.1038/s41566-022-01005-y
• 发表时间: 2022-05
• 期刊: Nature Photonics
• 影响因子: 35
• 作者: Yuzhe Xiao;M. Sheldon;M. Kats

Mechanisms of Photothermalization in Plasmonic Nanostructures: Insights into the Steady State

等离激元纳米结构中的光热化机制：对稳态的见解

• DOI: 10.1146/annurev-physchem-062422-014911
• 发表时间: 2023
• 期刊: Annual Review of Physical Chemistry
• 影响因子: 14.7
• 作者: Wu, Shengxiang;Sheldon, Matthew
• 通讯作者: Sheldon, Matthew

Active Tuning of Plasmon Damping via Light Induced Magnetism

• DOI: 10.1021/acs.nanolett.2c00571
• 发表时间: 2022-06-27
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Cheng, Oscar Hsu-Cheng;Zhao, Boqin;Sheldon, Matthew T.
• 通讯作者: Sheldon, Matthew T.