Novel Chemistries for Nanoscale Surface Functionalization by Molecular Layer Deposition

含有碳原子的有机薄膜是许多现代技术的重要组成部分，如微电子、生物医学材料和能源设备。在固体表面上添加有机薄膜提供了一种控制固体的电子、化学或机械性能的方法，以适应手头的任务。一种新兴的沉积有机基薄膜的方法是分子层沉积(MLD)，在这种方法中，以高度受控的方式应用厚度从单个分子层到数千个分子层的有机基薄膜。在这个项目中，Stacey Bent教授开发了新的化学反应来执行MLD，并研究了生成的薄膜中的成键。她正在研究一种新的MLD工艺，用于制造将有机材料和无机(非含碳)材料结合在一起的分子薄膜。这些杂化薄膜具有有趣的结构，混合了二维和三维类型的结合。这项研究在材料化学领域产生了更广泛的影响，从这项工作中获得的基本认识有助于介绍一种新的工具包，用于在固体材料上附着具有有用和可调性质的薄膜。本特教授培训研究生和本科生研究人员，并在她的实验室接待高中教师，以期在教育领域产生更广泛的影响，并延伸到当地社区。她积极推动不同群体的学生参与她的研究小组，并保持一个跨学科的研究环境。Bent教授还扩大了她帮助发起的本科暑期实习计划，为科学、技术、工程和数学领域的本科生提供机会，在与能源相关的小型公司获得实践经验。在这个研究计划中，斯坦福大学的Stacey Bent教授在高分子、超分子和纳米化学(MSN)计划的支持下，开发新的化学，用于进行纳米级有机基薄膜的分子层沉积(MLD)，并研究这些MLD系统中的链取向、堆积和结构。凭借其逐层的精确度和可控性，MLD提供了一个有用的平台来解决关于界面超分子组装的基本问题，包括分子间和分子内的成键以及结构-性质关系。这些研究主要通过三个方面的工作进行：探索形成有机界面膜的新型MLD偶联化学反应，引入一种新的MLD工艺制备2D金属硫化物与3D有机界面层相结合的杂化膜，以及研究分子间和界面键对膜的形态、结构和性能的影响。这项研究在材料化学领域产生了更广泛的影响，从这项工作中获得的基本认识有助于介绍一种新的工具包，用于在固体材料上附着具有有用和可调性质的薄膜。本特教授培训研究生和本科生研究人员，并通过斯坦福大学的外联项目在她的实验室接待高中教师，以期在接触当地社区方面产生更广泛的影响。她继续促进不同群体的学生参与她的研究小组，并保持一个跨学科的环境。本特教授还在扩大她帮助发起的本科生暑期实习计划，为STEM本科生提供在小型能源相关公司获得实践经验的机会。

Organic-based thin films, those containing carbon atoms, serve as important building blocks for many modern technologies, such as microelectronics, biomedical materials and energy devices. Adding an organic-based film onto a solid surface provides a method to control the electronic, chemical, or mechanical properties of the solid to suit the task at hand. One emerging method for depositing the organic-based film is molecular layer deposition (MLD), in which organic-based films ranging from a single molecular layer to thousands of molecular layers in thickness are applied in a highly controlled fashion. In this project, Professor Stacey Bent develops new chemical reactions to perform MLD, and also studies the bonding within the resulting films. She is investigating a new MLD process for making molecular films that combine both organic materials and inorganic (non-carbon containing) materials. These hybrid films have interesting structures that mix both two- and three-dimensional types of bonding. The research has broader impact in the field of materials chemistry and the fundamental understanding gained from this work helps introduce a new tool-kit for attaching thin films with useful and tunable properties to solid materials. Professor Bent trains both graduate and undergraduate student researchers, and hosts high school teachers in her laboratory for broader impacts in education and outreach to her local community. She actively promotes the participation of a diverse group of students in her research group and maintains an interdisciplinary research environment. Professor Bent also is expanding an undergraduate summer internship program, which she helped initiate, to provide opportunities for undergraduates in science, technology, engineering and math fields to gain hands-on experience in small, energy-related companies.In this research program, Professor Stacey Bent of Stanford University is supported by the Macromolecular, Supramolecular and Nanochemistry (MSN) Program to develop new chemistries for carrying out molecular layer deposition (MLD) of nanoscale organic-based thin films, and to study the chain orientation, packing and structure in these MLD systems. With its layer-by-layer precision and control, MLD provides a useful platform to address fundamental questions about interfacial supramolecular assemblies, including inter- and intramolecular bonding and structure-property relationships. The studies are carried out through three principal efforts: investigating new MLD coupling chemistries to form organic interfacial films, introducing a novel MLD process to make hybrid films combining 2D metal chalcogenides with 3D organic interlayers, and studying the role of intermolecular and interfacial bonding on film morphology, structure, and properties. The research has broader impact in the field of materials chemistry and the fundamental understanding gained from this work helps introduce a new tool-kit for attaching thin films with useful and tunable properties to solid materials. Professor Bent trains both graduate and undergraduate student researchers, and hosts high school teachers in her laboratory through outreach programs at Stanford University for broader impacts in outreach to her local community. She continues to promote the participation of a diverse group of students in her research group and maintain an interdisciplinary environment. Professor Bent also is expanding an undergraduate summer internship program, which she helped initiate, to provide opportunities for STEM undergraduates to gain hands-on experience in small, energy-related companies.