Raman enhancement on ultra-clean graphene quantum dots produced by quasi-equilibrium plasma-enhanced chemical vapor deposition

Donghua Liu, Xiaosong Chen, Yibin Hu, Tai Sun, Zhibo Song, Yujie Zheng, Yongbin Cao, Zhi Cai, Min Cao, Lan Peng, Yuli Huang, Lei Du, Wuli Yang, Gang Chen (), Dapeng Wei (), Andrew Thye Shen Wee and Dacheng Wei ()
Additional contact information
Donghua Liu: Fudan University
Xiaosong Chen: Fudan University
Yibin Hu: Chinese Academy of Science
Tai Sun: Chinese Academy of Sciences
Zhibo Song: National University of Singapore
Yujie Zheng: National University of Singapore
Yongbin Cao: Fudan University
Zhi Cai: Fudan University
Min Cao: Fudan University
Lan Peng: Fudan University
Yuli Huang: National University of Singapore
Lei Du: Chinese Academy of Science
Wuli Yang: Fudan University
Gang Chen: Chinese Academy of Science
Dapeng Wei: Chinese Academy of Sciences
Andrew Thye Shen Wee: National University of Singapore
Dacheng Wei: Fudan University

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract 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 × 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.

Date: 2018
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-017-02627-5 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-017-02627-5

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-017-02627-5

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().