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Electronic studies of paramagnetic iron oxide-gold, core-shell nanoparticles
19th International Conference on Nanotechnology and Expo
November 13-14, 2017 | Atlanta, USA
Eshilokun O Adeolu
Lagos State University, Nigeria
Posters & Accepted Abstracts: J Nanomed Nanotechnol
Abstract:
Using co-precipitation method, nanoparticles comprised of gold shell and magnetite/maghemite inclusion were synthesized by overgrowing the gold shell onto the magnetic seeds using sodium citrates as a reducing agent. Oxidized magnetite (Fe3O4) fabricated by co-precipitation of Fe2+ and Fe3+ in strong alkaline solution were used as magnetic cores. These magnetic nanoparticles were characterized by Transmission Electron Microscope (TEM), High Resolution Transmission Electron Microscope (HRTEM), UV-Visible and Atomic Force spectroscopies (ATS). The Transmission Electron Microscopy (TEM) image indicated that the particles were well dispersed and spherical in shape with an average size of 20 nm showing the crystallinity of the capped magnetite particles by gold. The UV-Visible (Varian Cary 100) absorption spectra of the deionized water used in the procedure of preparation of the nanoparticles showed no absorption peak in a wavelength range of 350-750 nm, but after introducing the suspension of the Aucoated magnetic nanoparticles, an absorption peak located at 526 nm appeared which is ascribed to the surface plasmon of nanosized Fe3O4@Au nanoparticles.