Functionalized Nanostructures at Interfaces

本项目由化学系高分子、超分子和纳米化学项目资助。马里兰州大学帕克分校的Littt-Robey和她的学生将使用扫描探针显微镜和光谱测量的组合来对结晶表面的功能化碳基C70纳米颗粒和纳米组装体进行成像。这项研究将确定官能团如何影响纳米粒子在界面处的传输、稳定性和结构排列。 Robett-Robey教授和她的学生将对两种纳米材料进行系统的测量：（1）共价官能化的纳米粒子和（2）通过弱（非共价）力连接的纳米分子组装体。 他们将开发真空兼容的液体输送方法，基于微气溶胶和微液体射流，用于在明确定义的表面上控制纳米材料的沉积。 他们将获得详细的地形和电位轮廓的离散物种的超高真空扫描探针显微镜通过互补的隧道为基础的和基于力的测量。 纳米粒子的电矩，极化率和立体特征对结构和动态演化的影响将被确定为原始的纳米粒子和溶剂化的纳米粒子和纳米组装。 在不同的热化学刺激下，纳米粒子的运动，拆卸和nanocompositon的分子水平的机制将被测量。该项目将为研究生和本科生以及初级科学家提供实验室研究经验，直接接触尖端的实验方法和仪器。 学生和研究人员将获得纳米颗粒表征，薄膜生长和先进材料制备方面的专业知识。 此外，学生将接受定量扫描探针测量和分析的培训，并将接受表面敏感显微镜和光谱学以及真空科学的实践培训和经验。 该项目包括对化学界面处纳米颗粒结构和动力学的系统探索，这将提供有关纳米颗粒如何在表面扩散并排列成功能结构的详细信息。 纳米粒子的取向在生长过程中，并被困在多层膜的外场可调谐性将通过结构和阻抗光谱测量量化。 学生和研究人员将有机会参与具有广泛的国家，国际和社会影响的教育和推广活动。

In this project, funded by the Macromolecular, Supramolecular and Nanochemistry Program of the Chemistry Division, Prof. Janice E. Reutt-Robey of the University of Maryland, College Park, and her students will use a combination of scanning probe microscopy and spectroscopy measurements to image functionalized carbon-based C70 nanoparticles and nanoassemblies at crystalline surfaces. This research will determine how functional groups influence the transport, stability and structural arrangements of nanoparticles at interfaces. Prof. Reutt-Robey and her students will undertake systematic measurements of two nanomaterial classes: (1) covalently functionalized nanoparticles and (2) nanomolecular assemblies joined by weak (noncovalent) forces. They will develop vacuum-compatible liquid delivery methods, based upon microaerosols and microliquid jets, for the controlled deposition of nanomaterials at well-defined surfaces. They will obtain detailed topographic and potentiometric contours of discrete species by UHV Scanning Probe Microscopy through complementary tunneling-based and force-based measurements. The impact of nanoparticle electric moment, polarizability, and stereo features on structure and dynamic evolution will be determined for pristine nanoparticles and for solvated nanoparticles and nanoassemblies. Molecular-level mechanisms for nanoparticle motion, disassembly and nanocrystallizaiton under different thermochemical stimuli will be measured. This project will provide laboratory research experiences for graduate and undergraduate students and junior scientists with direct exposure to cutting-edge experimental methods and instrumentation. Students and researchers will gain expertise in nanoparticle characterization, thin film growth and the preparation of advanced materials. Additionally, students will become trained in quantitative scanned probe measurements and analysis and will receive hands-on training and experience in surface-sensitive microscopies and spectroscopies and vacuum science. The project consists of a systematic exploration of nanoparticle structure and dynamics at chemical interfaces, which will provide detailed information on how nanoparticles diffuse at surfaces and arrange into functional structures. The external field tunability of nanoparticle orientation during growth and trapped in multilayer films will be quantified through structural and impedance spectroscopic measurements. Students and researchers will have significant opportunities to participate in educational and outreach activities with broad national, international and societal impact.