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A new route for the synthesis of a Ag nanopore-inlay-nanogap structure: integrated Ag-core@graphene-shell@Ag-jacket nanoparticles for high-efficiency SERS detection.

Hengwei Qiu, Minqiang Wang, Zhi Yang, Shouzhen Jiang, Yanjun Liu, Le Li, Minghui Cao, Junjie Li
Chemical Communications : Chem Comm 2017 August 12
We present a new route for the synthesis of Ag nanopore-inlay-nanogap structures using creviced graphene-shell encapsulated Cu nanoparticles (Cu@G-NPs) as the sacrificial templates. The as-synthesized integrated Ag-core@graphene-shell@Ag-jacket nanoparticles (AgC@G@AgJ-NPs) presents "chrysanthemum" shapes that contain abundant sub-10 nm size intraparticle nanopores/nanogaps, which can generate huge enhanced electromagnetic fields to support SERS activity, resulting in an average EF > 107 due to a high-density of intraparticle and interparticle "hot spots".

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