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

0511105 - FZÚ 2020 RIV GB eng J - Journal Article
Kovaleva, N. N. - Chvostová, Dagmar - Potůček, Zdeněk - Cho, H. D. - Fu, X. - Fekete, Ladislav - Pokorný, Jan - Bryknar, Z. - Kugel, K.I. - Dejneka, Alexandr - Kang, T. W. - Panin, G.N. - Kusmartsev, F.V.
Efficient green emission from edge states in graphene perforated by nitrogen plasma treatment.
2D Materials. Roč. 6, č. 4 (2019), s. 1-10, č. článku 045021. ISSN 2053-1583. E-ISSN 2053-1583
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA MŠMT(CZ) LO1409; GA MŠMT(CZ) LM2015088
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : perforated graphene * plasma treatment * photoluminescence * edge defects * graphene surface morphology
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 7.140, year: 2019
Method of publishing: Limited access
https://doi.org/10.1088/2053-1583/ab2ee9

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 250 nm leads to photoluminescence with the peaks at 390, 470, and 620 nm, 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.
Permanent Link: http://hdl.handle.net/11104/0301426