Bimetallic nanostructures based on Gold branched nanoparticles: The case of Platinum

Bimetallic nanomaterials have generated interest and increased research efforts in diverse scientific disciplines due to their unique and tunable properties arising from the synergistic combination of two distinct metallic elements. This study presents a novel approach for synthesizing branched gold-platinum nanoparticles, utilizing poly(allylamine hydrochloride) (PAH) stabilized branched gold nanoparticles with localized surface plasmon resonance (LSPR) response around 1000 nm as a template for platinum deposition. The resulting AuPt branched nanoparticles demonstrate optical activity. To assess their catalytic potential, we compared the enzymatic capabilities of gold and gold-platinum nanoparticles by examining their peroxidase-like activity in the oxidation of 3,3',5,5'-Tetramethylbenzidine (TMB). Our findings reveal that the bimetallic nanoparticles exhibit significantly enhanced catalytic properties, attributed to the incorporation of platinum onto the gold surface.