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Microscale golden Candock leaves self-aggregated on a polymer surface: Raman scattering enhancement and
Wei-Kang Wang1, Mei-Ling Zheng, Wei-Qiang Chen
1Laboratory of Organic NanoPhotonics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancunbeiyitiao No. 2, Beijing 100190, PR China.
Abstract:
Gold nanoparticles (AuNP's) 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's on amorphous surfaces have not been well explored. In this study, we present a simple in situ synthesis method for preparing AuNP's in which the AuNP's 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 AuCl(4)(-) as well as in controlling the release speed of AuCl(4)(-) 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's with a unique structure exhibited significantly enhanced surface Raman scattering and strong superhydrophobicity.
