In-situ Atomic Scale Studies of Nanoparticle-Solution Interface Processes
Northwestern University Evanston United States
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While synthesis and transformation processes to produce monodisperse nanoparticles are empirically well-developed, the pathways for these reactions as well as the exact role of synthetic agents and binding characteristics of surface moieties remain poorly understood. This lack of understanding is primarily due to the paucity of information about nanoparticle structural evolution at the atomic scale and an inability to characterize the nanoparticle-solution interface. This thesis addresses such nanoscale processes through use of an approach which combines in-situ X-ray atomic scale characterization XAFS and XRF with nanoscale morphological parameters derived from electron microscopy and SAXS. These techniques and approach provide significant insight into the chemical pathways that define bimetallic nanoparticle growth and establish a methodology for characterizing nanoparticle structure both of the inorganic core and molecular species coordinated to its surface at the atomic scale.
- Atomic and Molecular Physics and Spectroscopy