  Implementation of Au nanoparticles (NPs) is a subject for frontier plasmonic
research due to its fascinating optical properties. Herein, the present study
deals with plasmonic assisted emission properties of Au NPs-vertical graphene
(VG) hybrid nanostructures. The influence of effective polarizability of Au NPs
on the surface enhanced Raman scattering and luminescence properties is
investigated. In addition, a remarkable infra-red (IR) emission in the hybrid
nanostructures is observed and interpreted on the basis of intra-band
transitions in Au NPs. The flake-like nanoporous VG structure is invoked for
the generation of additional confined photons to impart additional momentum and
a gradient of confined excitation energy towards initiating the intra-band
transitions of Au NPs. Integrating Au plasmonic materials in three-dimensional
VG nanostructures enhances the light-matter interactions. The present study
provides a new adaptable plasmonic assisted pathway for optoelectronic and
sensing applications.
