English (United States)
Metallic nanoparticles have become a focus of research due to their many applications spanning various industries. One of their key applications is as catalysts in chemical reactions. Catalytic nanoparticles have the power to influence the products and reduce the amount of energy put into a reaction. The size, shape, and composition of nanoparticles greatly impact their catalytic capabilities. The arrangement of atoms on the surface of particles makes certain surface facets more favorable than others. Alloyed surfaces in particular are favorable due to their balance of stability and reactivity that constitutes an efficient catalyst. In this thesis, synthesis of alloyed bi- and tri-metallic particles is explored. All of the particles contain gold in combination with a reactive metal such as platinum or ruthenium. The ultimate goal was to combine the selectivity of gold with the reactivity of these secondary metals. Particles of Ir or Ru with Au were extensively studied to attempt to create particles of well-defined shapes with alloyed surfaces. The incorporation of these secondary metals proved difficult, however there are still possible alternate routes that should be pursued. Gold-silver particles were also focused on in the work of this thesis, specifically the shape-determining effect of platinum. It was found that seed-dilutions and temperature had more of a shape-determining effect than the Pt itself. The last system that was looked at was AuCu particles with the intent of reducing one layer of Cu on to Au. It was determined that Cu can deposit on Au, however these results are preliminary and the particles have not yet been tried as catalysts. Overall, the research for this thesis has lead to a deeper understanding of gold alloyed systems in seed-mediated nanoparticle synthesis with a future in catalysis.
Kent, Eija, "Effect of Secondary Metals in Gold Alloyed Nanoparticle Synthesis" (2019). Honors Theses - All. 2165.
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