Photo-induced formation and self-assembling of gold nanoparticles in aqueous solution of amphiphilic dendrimers with oligo(p-phenylene vinylene) core branches and oligo(ethylene oxide) terminal chains

摘要

Dendritic molecules with oligo(p-phenylenevinylene) core branches and oligo(ethylene oxide) terminal chains were found to be highly susceptible to the singlet oxygen mediated photooxidation process. These photosensitive amphiphilic dendrimers were used as both the photo-reducing agent and particle stabilizer for the formation of gold nanoparticles in an aqueous solution of hydrogen tetrachloroaurate (III) hydrate (HAuCl_4-3H_2O) at ambient atmosphere. Gold nanoparticles produced at high molar ratios of the amphiphilic dendrimer to HAuCU (>0.5) were demonstrated to be stable for several months, whereas relatively large hexagonal/triangular gold single-crystal films and self-assembled hollow fiber clusters were observed at lower molar ratios of the amphiphilic dendrimer to HAuCl_4.