Kovaleva_2019_2D_Mater._6_045021.pdf (2.35 MB)
Download file

Efficient green emission from edge states in graphene perforated by nitrogen plasma treatment

Download (2.35 MB)
journal contribution
posted on 19.08.2019, 10:27 by NN Kovaleva, D Chvostova, Z Potucek, HD Cho, Xiao Fu, L Fekete, J Pokorny, Z Bryknar, KI Kugel, A Dejneka, TW Kang, Gennady N Panin, Feodor Kusmartsev
Plasma functionalization of graphene is one of the facile ways to tune its doping level without the need for wet chemicals making graphene photoluminescent. Microscopic corrugations in the twodimensional structure of bilayer CVD graphene having a quasi-free-suspended top layer, such as graphene ripples, nanodomes, and bubbles, may significantly enhance local reactivity leading to etching effects on exposure to plasma. Here, we discovered that bilayer CVD graphene treated with nitrogen plasma exhibits efficient UV-green-red emission, where the excitation at 250nm leads to photoluminescence with the peaks at 390, 470, and 620nm, respectively. By using Raman scattering and spectroscopic ellipsometry, we investigated doping effects induced by oxygen or nitrogen plasma on the optical properties of single- and bilayer CVD graphene. The surface morphology of the samples was studied by atomic force microscopy. It is revealed that the top sheet of bilayer graphene becomes perforated after the treatment by nitrogen plasma. Our comprehensive study indicates that the dominant green emission is associated with the edge defect structure of perforated graphene filled with nitrogen. The discovered efficient emission appearing in nitrogen plasma treated perforated graphene may have a significant potential for the development of advanced optoelectronic materials.

Funding

MEYS LO1409 project funded by the Infrastructure SAFMAT LM2015088, Operational Program Research, Development and Education, co-financed by the European Structural and Investment Funds and the state budget of the Czech Republic within Center of Advanced Applied Sciences, Reg. No. CZ.02.1.01/0.0/0.0/16_019/0000778, project SOLID21 Reg. No. CZ.02.1.01/0.0/0.0/16_019/0000760, and partially supported by the Basic Science Research Program (2017R1D1A1B03035102 and 2017R1D1A1B03032759), the International Research and Development program (2016R1A6A1A03012877) through the NRF and MEST of Korea, and by Russian Foundation for Basic Research according to the research project N19-29-03050.

Royal Society grant IEC\R2\170043

History

School

  • Science

Department

  • Physics

Published in

2D Materials

Volume

6

Issue

4

Publisher

IOP Publishing

Version

VoR (Version of Record)

Rights holder

© IOP Publishing Ltd

Publisher statement

This is an author-created, un-copyedited version of an article published in 2D Materials. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/2053-1583/ab2ee9.

Acceptance date

03/07/2019

Publication date

2019-07-24

Copyright date

2019

eISSN

2053-1583

Language

en

Depositor

Prof Fedor Kusmartsev

Article number

045021