文摘
Gold nanoparticles (AuNP鈥檚) prepared through a controllable synthesis and aggregation process are attractive for their unique properties that arise from their surface plasmon resonances (SPRs). However, aggregation-controlled AuNP鈥檚 on amorphous surfaces have not been well explored. In this study, we present a simple in situ synthesis method for preparing AuNP鈥檚 in which the AuNP鈥檚 self-aggregate into microscale Candock-leaf-like structures on a polyelectrolyte film (PEF) surface. In this approach, the PEF plays an important role in adsorbing and storing AuCl4鈭?/sup> as well as in controlling the release speed of AuCl4鈭?/sup> in the preparation process. The mechanism for forming these Candock-leaf-like structures has been illustrated by both the growth process of gold nanoparticles and the Ostwald ripenning of the aggregations. AuNP鈥檚 with a unique structure exhibited significantly enhanced surface Raman scattering and strong superhydrophobicity.