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3987872
How gold nanoparticle size affects density of states | Poster Board #1321
Date
March 18, 2024
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Gold nanoparticles (AuNPs) have varying applications including, but not limited to, plasmonic solar cells, photocatalysis, photothermal heating, cancer treatment, and more. These applications are built on the electronic properties of the nanoparticles, which arise from their electronic structure and which can be controlled by ligand identity, ligand size, size of the particle, and more. The electronic change in these particles continues to be a topic of perennial interest because of their various applications. While much focus has been given to the evolution of the plasmon with size, this is not a direct measure of their electronic structure. We present work in which we use measurements of Pauli paramagnetism to directly probe the change in the density of electronic states with particle size. This is done to characterize where the electronic properties of AuNPs becomes one in the same with bulk gold, which is expected to occur asymptotically. AuNPs were synthesized from gold salt (AuHCl4) and octanethiol. Size was measured with TEM and paramagnetism was measured with Evans method NMR and TGA. We then discuss the dependence of the electronic structure upon the size of the metal core.
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