期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-02627-5
关键词
-
资金
- National Program for Thousand Young Talents of China
- National Natural Science Foundation of China [51773041, 21603038, 21544001, 11404329, 61474130, 11504395]
- National High-tech R&D Program of China (863 Program) [2015AA034801]
- Natural Science Foundation Project of CQ CSTC [CSTC2014jcyjjq50004]
- Fudan University
- one hundred talents project of the Chinese Academy of Sciences
Graphene is regarded as a potential surface-enhanced Raman spectroscopy (SERS) substrate. However, the application of graphene quantum dots (GQDs) has had limited success due to material quality. Here, we develop a quasi-equilibrium plasma-enhanced chemical vapor deposition method to produce high-quality ultra-clean GQDs with sizes down to 2 nm directly on SiO2/Si, which are used as SERS substrates. The enhancement factor, which depends on the GQD size, is higher than conventional graphene sheets with sensitivity down to 1 x 10(-9) mol L-1 rhodamine. This is attributed to the high-quality GQDs with atomically clean surfaces and large number of edges, as well as the enhanced charge transfer between molecules and GQDs with appropriate diameters due to the existence of Van Hove singularities in the electronic density of states. This work demonstrates a sensitive SERS substrate, and is valuable for applications of GQDs in graphene-based photonics and optoelectronics.
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