Graphene oxide in nanoparticle fragmentation – size control via direct adsorption

Full-physical synthesis of metal nanoclusters below 3 nm in size holds the promise to deliver ligand-free clusters that are active for catalytic or (bio)photonic applications. Stabilization of the smallest clusters in laser-induced fragmentation remains a challenge, if ultrapure colloid from laser ablation without any surfactants is used. We introduced graphene oxide (GO) as non-passivating agent (report to SC5265). In the first experiment an influence on the fragmentation at high laser fluence was found. This change is explained as caging effect rather than inhibition of cluster ripening. Therefore, it is proposed to block agglomeration via direct adsorption of the initial colloid on GO by electrostatic screening prior to fragmentation.