Probing Local Structural and Chemical Properties of Atomically Thin Two-Dimensional Materials by Optical Scanning Tunneling Microscopy

通过光学扫描隧道显微镜探测原子薄二维材料的局部结构和化学性质

• 批准号: 2211474
• 负责人: Nan Jiang
• 金额: $ 53.75万
• 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: 2022
• 资助国家: 美国
• 起止时间: 2022-07-15 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2211474&HistoricalAwards=false
• 关键词: Probing; Local; Structural; Chemical; Properties

NON-TECHNICAL SUMMARYThe development of new technological applications requires new materials with appropriate properties. Two-dimensional (2D) materials attract tremendous interest because they have a broad range of material properties for creating complex artificial structures with novel functionalities unavailable in natural bulk materials. By harnessing their unique properties, 2D materials can be used for many applications, such as flexible electronics, miniaturized devices, and providing electricity for wearable electronics. In this project, funded by the Solid State and Materials Chemistry Program of the Division of Materials Research, Prof. Nan Jiang and his research group at the University of Illinois, Chicago, will focus on the synthesis of boron monolayer (borophene) related 2D materials, which have unique structural and physical properties. The project encompasses the development of complex borophene-based structures and the measurement of their local properties with an unprecedented spatial resolution. Such advanced understanding is essential for fine-tuning the properties of 2D structures for electronics, photonics, sensing, and energy-harvesting applications. This project will recruit and train undergraduate and graduate students from underrepresented groups and will be integrated into a broad set of outreach efforts, including programs and demonstrations in elementary schools. TECHNICAL SUMMARYThis project, supported by the Solid State and Materials Chemistry Program of the Division of Materials Research, develops a new approach to precisely control and fundamentally understand the interplay among lattice, defects, and the electronic structure of novel 2D materials, such as borophene. The studies involve the direct observation of vibrational modes of borophene-based structures using a state-of-the-art technique that combines scanning tunneling microscopy (STM) with tip-enhanced Raman spectroscopy (TERS). This method facilitates the imaging and characterization of local vibrational and electron-phonon coupling properties of nano- and atomic-scale heterogeneity with approximately 5-Angstrom spatial resolution and 5-wavenumber spectroscopic resolution. In addition to detecting topographical and electronic properties, the STM-TERS approach elucidates localized interfacial features, including strain, defects, and doping at the atomic-thickness limit. Building on these groundbreaking technological advances, the project investigates the chemical modification of borophene via oxygen, defines the hybridization of borophene with organic molecules, and constructs borophene-related 2D van der Waals heterostructures. Collectively, these studies provide unprecedented insights into the relationship between charge and lattice at the atomic-thickness limit.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.

非技术总结新技术应用的开发需要具有适当特性的新材料。二维（2D）材料引起了极大的兴趣，因为它们具有广泛的材料特性，可在自然散装材料中创建具有不可用的新功能的复杂人工结构。通过利用其独特的特性，可以将2D材料用于许多应用，例如柔性电子设备，微型设备，并为可穿戴电子设备提供电力。在该项目中，由材料研究部的固态和材料化学计划资助，Nan Jiang教授及其在芝加哥伊利诺伊大学的研究小组将重点关注硼龙单层（Borophene）相关的2D材料的合成，具有独特的结构和物理特性。该项目涵盖了复杂的基于硼苯结构的发展以及以空前的空间分辨率来测量其局部特性。这种先进的理解对于对电子，光子学，传感和能量收获应用的2D结构的性质进行微调至关重要。该项目将招募和培训来自代表性不足的团体的本科生和研究生，并将纳入一系列广泛的外展工作，包括小学的计划和示威活动。材料研究部的固态和材料化学计划的支持，技术摘要项目开发了一种新的方法来精确控制，并从根本上了解晶格，缺陷和新型2D材料（例如硼苯）的电子结构之间的相互作用。该研究涉及使用最先进的技术直接观察唯一的基于唯一的结构的振动模式，该技术将扫描隧道显微镜（STM）与尖端增强的拉曼光谱（TERS）结合在一起。这种方法促进了纳米和原子级异质性的局部振动和电子偶联特性的成像和表征，并具有大约5-ANGSTROM空间分辨率以及5波谱分辨率分辨率的成像和表征。除了检测地形和电子特性外，STM TERS方法还阐明了局部界面特征，包括应变，缺陷和在原子厚度极限处。在这些开创性的技术进步的基础上，该项目通过氧气研究了唯一的唯一化学修饰，定义了唯一的有机分子的杂交，并构建了与硼苯相关的2D Van der Waals异质结构。总的来说，这些研究提供了对原子厚度限制的指控与晶格之间关系的前所未有的见解。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评估标准来通过评估来获得支持的。

项目成果

The selective blocking of potentially catalytically active sites on surface-supported iron oxide catalysts

表面负载氧化铁催化剂上潜在催化活性位点的选择性封闭

• DOI: 10.1039/d2qm01025a
• 发表时间: 2023
• 期刊: Materials Chemistry Frontiers
• 影响因子: 7
• 作者: Liu, Dairong;Li, Linfei;Gedara, Buddhika S.;Trenary, Michael;Jiang, Nan
• 通讯作者: Jiang, Nan

Nanoscale Chemical Probing of Metal-Supported Ultrathin Ferrous Oxide via Tip-Enhanced Raman Spectroscopy and Scanning Tunneling Microscopy

• DOI: 10.1021/cbmi.4c00015
• 发表时间: 2024-03
• 期刊: Chemical & Biomedical Imaging
• 作者: Dairong Liu;Linfei Li;Nan Jiang