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- Title
Graphene‐coated Au nanoparticle‐enhanced Raman spectroscopy.
- Authors
Zhang, Yue‐Jiao; Chen, Qing‐Qi; Chen, Xing; Wang, An; Tian, Zhong‐Qun; Li, Jian‐Feng
- Abstract
Surface‐enhanced Raman spectroscopy (SERS) is a powerful surface analytical technique; however, its lack of material and morphological generality is a longtime limitation. The invention of shell‐isolated nanoparticle‐enhanced Raman spectroscopy (SHINERS) using silica shell‐encapsulated Au nanoparticles (NPs) overcomes these problems. Whereas, it is difficult to obtain a silica shell (less than 1 nm thick) without pinholes for generating extremely high SERS enhancements. Graphene is one of the most promising two‐dimensional materials, which has a single‐atom layer thickness. Moreover, graphene can provide additional SERS chemical enhancement. Herein, we prepared graphene‐coated Au (Au@G) NPs via chemical vapor deposition (CVD). The graphene shell thickness could be controlled from a few layers to multilayers, and the Au@G SERS activities were characterized using mercaptobenzoic acid (MBA) as a probe molecule. Both the pH and high‐temperature stabilities of the Au@G nanoparticles were characterized. Also, Pt‐on‐Au@G satellite structures were developed via a self‐assembly method. Whereby Au@G nanoparticles were coated with Pt nanocatalysts, and this bifunctional SERS substrate could be used to monitor in situ catalytic reaction mechanisms occurring on the Pt surface.
- Subjects
SERS spectroscopy; RAMAN spectroscopy; CHEMICAL vapor deposition; GOLD nanoparticles; GRAPHENE synthesis; SURFACE enhanced Raman effect
- Publication
Journal of Raman Spectroscopy, 2021, Vol 52, Issue 2, p439
- ISSN
0377-0486
- Publication type
Article
- DOI
10.1002/jrs.5950