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

doi:10.1039/c7cc04218c

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

Chem Commun (Camb). 2017 Aug 11;53(62):8691-8694. doi: 10.1039/c7cc04218c. Epub 2017 Jul 19.

Authors

Hengwei Qiu¹, Minqiang Wang¹, Zhi Yang¹, Shouzhen Jiang², Yanjun Liu³, Le Li¹, Minghui Cao¹, Junjie Li¹

Affiliations

¹ Electronic Materials Research Laboratory (EMRL), Key Laboratory of Education Ministry, International Center for Dielectric Research (ICDR), School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China. mqwang@mail.xjtu.edu.cn.
² School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
³ Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China.

PMID: 28722075
DOI: 10.1039/c7cc04218c

Abstract

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".