![]() ![]() Iron oxide nanoparticles exhibit many unique magnetic properties like superparamagnetic, low Curie temperature, high magnetic susceptibility, etc. Facile synthesis route, controllable size, and biocompatibility had been the contributing elements for their success. Forms of iron oxide nanoparticles like magnetite (Fe 3O 4) and maghemite (γ-Fe 2O 3) nanoparticles have been some of the extensively studied nanomaterials. Iron oxide nanoparticles (IONP) have received increasing attention and have been the focus of research from many years. Upon coating with gold shell, saturation magnetisation of iron oxide nanoparticles decreases from 42.806 to 3.54 emu/gram. Both uncoated and gold-coated magnetite exhibited superparamagnetic behaviour at room temperature. The synthesised nanocomposites had a total organic content of around 3.2% w/w and also showed a shifted SPR peak at 546 nm as compared to gold nanoparticles (528 nm). X-ray diffraction analysis confirms presence of gold on the surface of magnetite nanoparticles. The synthesised nanocomposite was monodispersed with a mean particle size of around 16 nm and polydispersity index of 0.190. Dehydro-ascorbic acid acts as a capping agent to impart stability to as synthesised gold-coated iron oxide nanocomposites. Ascorbic acid not only acts as a reducing agent, but also the oxidised form of ascorbic acid i.e. The nanocomposites were produced by reduction (using ascorbic acid) of gold chloride on to the surface of iron oxide nanoparticles. Gold-coated magnetite nanoparticles were synthesised to combine both magnetic as well as surface plasma resonance (SPR) properties in a single moiety. The current article reports on providing surface modification of magnetic nanoparticles with gold to provide stability against aggregation. ![]()
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