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。在固体表面添加有机薄膜提供了一种方法来控制固体的电子、化学或机械性能，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），其中有机基薄膜的厚度范围从单个分子层到数千个分子层，以高度控制的方式应用。在这个项目中，Stacey Bent教授开发了新的化学反应来执行MLD，并研究了所产生的薄膜内的键合。她正在研究一种新的MLD工艺，用于制作结合有机材料和无机（不含碳）材料的分子膜。这些混合薄膜具有有趣的结构，混合了二维和三维类型的键合。这项研究在材料化学领域具有更广泛的影响，从这项工作中获得的基本理解有助于引入一种新的工具，用于将具有有用和可调性能的薄膜附着到固体材料上。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，以扩大对教育和当地社区的影响。她积极推动不同群体的学生参与她的研究小组，并保持跨学科的研究环境。本特教授还在扩大她参与发起的本科生暑期实习项目，为科学、技术、工程和数学领域的本科生提供在小型能源相关公司获得实践经验的机会。在这个研究项目中，斯坦福大学的Stacey Bent教授在大分子、超分子和纳米化学（MSN）项目的支持下，开发新的化学方法来实现纳米级有机薄膜的分子层沉积（MLD），并研究这些MLD系统中的链取向、包装和结构。凭借其逐层的精度和控制，MLD为解决界面超分子组装的基本问题提供了一个有用的平台，包括分子间和分子内键和结构-性质关系。研究主要通过三个方面进行：研究新的MLD偶联化学形成有机界面膜，引入一种新的MLD工艺，将二维金属硫族化合物与三维有机中间层结合在一起，制备杂化膜，研究分子间和界面键合对膜形态、结构和性能的作用。这项研究在材料化学领域具有更广泛的影响，从这项工作中获得的基本理解有助于引入一种新的工具，用于将具有有用和可调性能的薄膜附着到固体材料上。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展项目在她的实验室接待高中教师，以扩大对当地社区的外展影响。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项目，为STEM专业的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.