Laser-ablation-assisted SF6 decomposition for extensive and controlled fluorination of graphene

0517285 - ÚFCH JH 2020 RIV US eng J - Journal Article
Plšek, Jan - Drogowska, Karolina - Fridrichová, Michaela - Vejpravová, J. - Kalbáč, Martin
Laser-ablation-assisted SF6 decomposition for extensive and controlled fluorination of graphene.
Carbon. Roč. 145, APR 2019 (2019), s. 419-425. ISSN 0008-6223. E-ISSN 1873-3891
R&D Projects: GA ČR GA18-20357S; GA MŠMT(CZ) LTC18039; GA MŠMT(CZ) LM2015073; GA MŠMT(CZ) EF16_013/0001821
Institutional support: RVO:61388955
Keywords : oriented pyrolytic-graphite * sulfur-doped graphene * surface * catalyst * defects * excimer
OECD category: Physical chemistry
Impact factor: 8.821, year: 2019
Method of publishing: Limited access

We present a safe, clean, convenient and easy-to-control method for extensive fluorination of graphene using laser-ablation-assisted decomposition of gaseous SF6 molecules. The decomposition process is based on irradiation of a silicon target using a Nd:YAG laser (532 nm) in an SF6 atmosphere. The reactive species produced in the plume above the silicon target are consequently responsible for fluorination of graphene placed in proximity to the plume. The applicability of the proposed method is demonstrated on fluorination of CVD-grown graphene on copper foil. Samples with different fluorination levels were evaluated using both X-ray photoelectron spectroscopy and Raman spectroscopy. The influence of the applied number of laser pulses on the nature of the CeF bonds, fluorine and sulphur concentrations, as well as graphene damage, is discussed. The method enables control of fluorine content by simple counting of laser pulses. We show that a fluorination level corresponding to a stoichiometry up to C1.4F can be achieved. The fluorination does not lead to the formation of Cu-F, in contrast to previously published approaches. (c) 2019 Published by Elsevier Ltd.
Permanent Link: http://hdl.handle.net/11104/0302589