Reversible Enlargement of Photoswitchable Dielectric Properties by Plasmonic [60]Fullerenyl Core-Shell Nanoparticles on Graphene Nanosheets

Utilization of [60]fullerosome monolayer grafting approach on both sides of graphene nano-sheets giving the corresponding sandwiched nanostructures was demonstrated as a key intermediate for the construction of photoswitchable and tunable dielectric graphene nanosheet materials. They were covered by magnetic plasmonic core-shell nanoparticles of γ-FeOx@AuNP and light-harvesting C60(>DPAF-C9) monoadduct conjugates as the shell layer via the subsequent deposition procedure. Resulting multilayered core-shell nanosheet materials were found to be capable of inducing reversible dielectric property amplification effects in a photoswitching manner at the RF frequency range of 1.0‒18 GHz. They were also found to be RF-wave absorbing materials that led to the observation of minimum reflection coefficient values (low ‒dB). We substantiated these photophysical properties by relative dielectric (er’) measurements and related applications using a combination of bistatic angle (θ)-, frequency-, and irradiation time-depe...