NMR Characterization of Molecular Structure and Dynamics in Ligand-Capped Metal and Metal Oxide Nanoparticles

亚利桑那州立大学的杰弗里·L·雅格教授和格雷戈里·P·霍兰德教授在化学系大分子、超分子和纳米化学计划的支持下，利用固体和液体核磁共振技术研究表面功能化纳米粒子的分子结构和动态性质。拟议的研究重点集中在两类配体封顶的NP上。第一类是用膦酸改性的无机氧化物，第二类是用膦或膦酸改性的金和银金属纳米颗粒。溶液状态核磁共振将被用来研究当纳米粒子被溶剂化时的配体结合化学和传输性质，魔角旋转(MAS)固体核磁共振将被用来表征固体形式的封闭剂和核心结构。纳米粒子在水溶液和有机溶液中的迁移率将通过脉冲场梯度(PFG)扩散测量来探测。这项研究涉及固体和液体核磁共振技术的发展，以获得关于纳米颗粒的化学信息，这是目前的表面分析技术所不能获得的。这项研究的首要目标是了解和控制纳米颗粒的表面化学。这样的理解是成功制造纳米器件的关键，这些器件的应用范围从能量存储到催化。学生将接受高级核磁共振技术和纳米科学方面的培训，K-12教师将参与这一研究项目。

Professors Jeffery L Yarger and Gregory P. Holland of Arizona State University are supported by the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program in the Division of Chemistry to study the molecular structure and dynamic properties of surface functionalized nanoparticles (NPs) using solid and liquid state NMR techniques. The focus of the proposed research is on two classes of ligand-capped NPs. The first is inorganic oxides modified with phosphonic acids and the second is Au and Ag metal NPs modified with phosphines or phosphonic acids. Solution-state NMR will be used to study the ligand binding chemistry and transport properties when the NPs are solvated and magic angle spinning (MAS) solid state NMR will be utilized for characterization of the capping agent and core structure in the solid form. The mobility of the NPs in aqueous and organic solutions will be probed with pulsed field gradient (PFG) diffusion measurements. This research involves the development of solid and liquid state NMR techniques to obtain chemical information on nanoparticles that is not available with currently existing surface analytical techniques. The overarching goal of this research is to understand and control the surface chemistry of nanoparticles. Such an understanding is key for the successful fabrication of nanodevices for applications ranging from energy storage to catalysis. Students will be trained in advanced NMR techniques and nanoscience and K-12 teachers will be involved in this research project.