OP: Surface- and Coherence-Enhanced Raman Sensing on MoS2 Heterogeneous Catalysts

OP：MoS2 多相催化剂的表面和相干增强拉曼传感

• 批准号: 1609608
• 负责人: Zhenrong Zhang
• 金额: $ 36万
• 依托单位: Baylor University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1609608&HistoricalAwards=false
• 关键词: OP; Surface; Coherence; Enhanced; Raman

With support from the Chemical Measurement and Imaging Program in the Division of Chemistry and the Ceramics Program in the Division of Materials Research, Professor Zhang at Baylor University and Professors Sokolov and Voronine at Texas A&M University are applying various Raman techniques to monitor hydrodesulfurization reactions on a semiconductor substrate. Hydrodesulfurization is a catalytic chemical process widely used to remove sulfur from natural gas and from refined petroleum products. Understanding how it happens on a catalytic substrate will help to improve oil refining efficiency and reduce environmental impacts. Traditional plasmonic Raman techniques are used to study these reactions on noble metals (gold, silver, and copper). Although these noble metals are important, the ability to study reactions on non-metallic catalytic substrates is needed. Professors Zhang, Sokolov and Voronine are using the most advanced state-of-the-art Raman spectroscopic techniques to examine reactions on non-metallic substrates, such as molybdenum disulfide (MoS2). The methods they are developing have the potential to lead to broad applications in many areas other than oil refinery studies. For example, the developed techniques could be used to monitor pollutants in environmental analysis or decipher DNA sequences. Three professors are also actively involved in many outreach activities by bringing the exciting world of nanoplamonics research to undergraduate students and to the general public through the programs such as the "Physics Day" event on campus, annual scanning tunneling microscopy (STM) training sessions, and the Research Experiences for Undergraduates (REU) program. Professor Zhang at Baylor University, Professors Sokolov and Voronine at Texas A&M University are advancing molecular-level chemical identification of molecules on non-traditional Raman scattering materials, such as MoS2, an important material for heterogeneous catalysis, using a combination of the most advanced Raman spectroscopies. They are working on three subprojects a) to examine the origin of Surface-Enhanced Raman Spectroscopy (SERS) on the two-dimensional (2D) semiconductor; b) to achieve unprecedented Raman signal enhancement on the 2D materials via a combination of the surface enhancement of SERS and the coherence enhancement of Femtosecond Adaptive Spectroscopic Technique for Coherent Anti-Stokes Raman Scattering (FAST CARS); and c) to identify the chemical composition of reagents, intermediates, and products with submonolayer sensitivity and nanoscale spatial resolution using Tip-Enhanced Raman Spectroscopy (TERS). Their work focuses on the molecular-level approach to understanding the chemical and physical nature of the Raman signal enhancement in non-metallic nanostructures. The expected outcomes of their research include better understanding of the structure-function relationships in semiconductors for new designs of advanced materials with improved functionalities.

在化学系化学测量与成像项目和材料研究系陶瓷项目的支持下，贝勒大学的张教授和德克萨斯农工大学的Sokolov和Voronine教授正在应用各种拉曼技术来监测加氢脱硫反应。半导体衬底。加氢脱硫是一种广泛用于从天然气和精炼石油产品中脱硫的催化化学过程。了解它在催化基质上如何发生将有助于提高炼油效率并减少对环境的影响。传统的等离子体拉曼技术用于研究贵金属（金、银和铜）上的这些反应。尽管这些贵金属很重要，但需要研究非金属催化基材上的反应的能力。张教授、索科洛夫和沃罗宁教授正在使用最先进的拉曼光谱技术来检查非金属基材（例如二硫化钼（MoS2））上的反应。他们正在开发的方法有可能在炼油厂研究以外的许多领域得到广泛应用。例如，所开发的技术可用于监测环境分析中的污染物或破译DNA序列。三位教授还积极参与许多外展活动，通过校园“物理日”活动、年度扫描隧道显微镜 (STM) 培训课程、和本科生研究经验（REU）计划。贝勒大学的张教授、德克萨斯农工大学的 Sokolov 和 Voronine 教授正在结合最先进的拉曼技术，在非传统拉曼散射材料（例如多相催化的重要材料 MoS2）上推进分子水平的化学识别。光谱检查。他们正在开展三个子项目：a) 研究二维 (2D) 半导体表面增强拉曼光谱 (SERS) 的起源； b) 通过结合SERS表面增强和相干反斯托克斯拉曼散射飞秒自适应光谱技术（FAST CARS）的相干增强，在二维材料上实现前所未有的拉曼信号增强； c) 使用尖端增强拉曼光谱 (TERS) 识别具有亚单层灵敏度和纳米级空间分辨率的试剂、中间体和产品的化学成分。他们的工作重点是用分子水平的方法来理解非金属纳米结构中拉曼信号增强的化学和物理性质。他们研究的预期成果包括更好地理解半导体的结构与功能关系，以实现功能改进的先进材料的新设计。