Synthesis and Characterization of Hybrid Nanocomposites of Gold Nanostars Encapsulated on Graphene Oxide as Active SERS Nanotags
Corressponding author's email:
nhungtt@hcmute.edu.vnDOI:
https://doi.org/10.54644/jte.70B.2022.1155Keywords:
Gold nanostars, Graphene oxide, Hybrid nanocomposites, SERS, NanotagsAbstract
Hybrid nanocomposites of gold nanostars and graphene oxide exhibit intriguing optical and electrical properties derived from the sharp-tip effect of nanostars and the high conductivity of honeycomb structure from C-sp2 hybridization of graphene-based materials. This work presents a facile way to wrap graphene oxide nano-colloids surrounding the as-prepared gold nanostars via the assistance of linker molecules, 4-aminothiophenol, as effective nanotags. Upon tightly binding to the surface of gold nanostars via gold- thiol interactions, 4-aminothiophenol can modify the surface of gold nanostars positively charged originated from amine groups and thus facilitate the self-assembly of negatively charged graphene oxide to wrap around the surface of gold nanostars. The SEM, TEM images and the shift in the Uv-Vis spectra of the resulting gold nanostars- graphene oxide nanocomposites reveal the successful encapsulation. Besides, the enhanced Raman signal of 4-aminothiophenol highlights the potential of the obtained gold nanostars-graphene oxide hybrids as effective nanotags for applications in surface enhanced Raman scattering sensing and bio-imaging.
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