Seed-mediated Plasmon-driven Regrowth of Silver Nanodecahedrons (NDs)
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We report the synthesis of silver nanodecahedrons (NDs) for extending the localized surface plasmon resonance (LSPR) of silver nanostructures from blue to green-orange (~590 nm), which will enable much wider application opportunities using common laser light sources. In our photo-assisted method, we use a light-emitting-diode (LED) to control regrowth of silver ND from precursor seeds. Highly uniform silver NDs are synthesized when the LED emission peak coincides with the LSPR peak of the seeds. A two-step process involving precursor self-transformation into silver nanoprisms and nanoplates, and subsequent photo-activated regrowth of silver NDs has been proposed. Surface-enhanced Raman scattering of silver NDs in different sizes has been studied, and the average enhancement factor for each size is estimated to be in the order of ~106.
KeywordsLocalized surface plasmon resonance (LSPR) Silver nanodecahedron (AgND) Photochemical synthesis Surface-enhanced Raman scattering (SERS)
The authors thank Drs. Isakov Dmitry and Ning Ke for conducting FESEM and TEM characterizations of the samples, respectively. The project is supported by SIMTech collaborative research grant SIM/09-220001. HFL's research studentship and a Group Research Grant 3110048 from The Chinese University of Hong Kong are gratefully acknowledged.