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Iron Oxide–Gold Composite Nanoparticles and Nano-Gap Junctions for Sensing Applications Using Surface-Enhanced Raman Scattering

Minerals, Metals and Materials Series, ISSN: 2367-1696, Page: 255-275
2021
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Book Chapter Description

Multifunctional iron oxide–gold composite nanostructures with tailored “hot-spot” nano-gap junctions have been produced via a multi-seed-mediated approach and investigated for analyte detection. Tunable nano-gap “hotspot” junctions based on gold nanospheres were rationally created on iron oxide surface and evaluated for surface-enhanced Raman scattering (SERS) enhancement studies for a model reporter analyte, 4-mercaptophenol. Surface-enhanced Raman scattering studies show a three-time enhancement effect for composite gold–iron oxide nanoparticles when compared with gold nanostructures. These enhancements are attributed to the presence of the “hot-spot” junctions and nano-gaps obtained from both: (a) multi-seed-mediated approach that generates larger decoration of iron oxide with plasmonic nanoparticles and (b) aggregated assemblies formed due to the key magnetic iron oxide nanostructures.

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