Gold nanoparticles-platinum nanodots-graphene interfaced spherical colloidal nanodendrites: Synthesis and studies for plasmonic multiple photo-system modality

Here, we report multi-component plasmonic core–shell nanodendrites (Pt@rGO-AuNPs) composed of nano-sized reduced graphene oxide coated gold nanoparticles as a multiple photo-system modality. The prepared Pt@rGO-AuNPs took 40, 60, and 75 min with the pseudo first-order rate constants 0.112 min⁻¹ 0.069 min⁻¹ and 0.048 min⁻¹ to completely degrade (≥98%) methylene blue, methyl red, and methyl orange, respectively, at room temperature. Pt@rGO-AuNPs also showed a high photothermal effect (temperature ≥43° C in 5 min, 808 nm laser, 6 W/cm²) and found to have robust morphology during recyclability for at least five cycles in both photocatalytic and photothermal processes.