Title:
Synthesis of silver and platinum nanocrystals and surface modifications of gold nanocrystals

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Zhou, Shan
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Xia, Younan
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Abstract
Noble-metal nanocrystals with controlled sizes, shapes and surface properties have received considerable interests owing to their extensive use in applications related to plasmonics, electronics, catalysis, and biomedicine. This dissertation is focused on development of synthetic methods for tightly controlling the shape of nanocrystals and for modifying their surface properties. I begin by demonstrating two methods for shape-controlled synthesis, including one-pot synthesis and seed-mediated growth, to obtain Ag nanocubes with sharp corners and edges in a water-based system. I then demonstrate an indirect ligand exchange method for effectively replacing the surface ligands on Au nanocrystals with different morphologies. Finally, I conduct a quantitative analysis of the reduction kinetics to establish the relationship between the reduction pathways and the final morphologies taken by the Pt nanocrystals. This dissertation concludes by highlighting opportunities and perspectives for future research. The approaches elaborated in this work can provide guidelines for the rational design of nanocrystal synthesis to achieve precise control over the shape and surface properties of the products.
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2018-07-23
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