The use of sample positioning to control defect creation by oxygen plasma in isotopically labelled bilayer graphene membranes

0541683 - ÚFCH JH 2022 RIV GB eng J - Journal Article
Guerra, Valentino Libero Pio - Valeš, Václav - Mikšátko, Jiří - Plšek, Jan - Drogowska-Horna, Karolina A. - Volochanskyi, Oleksandr - Kalbáč, Martin
The use of sample positioning to control defect creation by oxygen plasma in isotopically labelled bilayer graphene membranes.
RSC Advances. Roč. 11, č. 17 (2021), s. 10316-10322. E-ISSN 2046-2069
R&D Projects: GA ČR(CZ) GX20-08633X; GA MŠMT EF16_026/0008382
Grant - others:Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_026/0008382
Institutional support: RVO:61388955
Keywords : graphene membranes * oxygen plasma * Raman spectroscopy
OECD category: Physical chemistry
Impact factor: 4.036, year: 2021
Method of publishing: Open access

Monolayer and isotopically labelled bilayer graphene membranes were prepared on grids for transmission electron microscopy (TEM). In order to create defects in the graphene layers in a controlled way, we studied the sensitivity of the individual graphene layers to the oxygen plasma treatment. We tested samples with different configurations by varying the order of the transfer of layers and changing the orientation of the samples with respect to the plasma chamber. Using Raman spectroscopy, HRTEM and X-ray photoelectron spectroscopy, we demonstrated defect formation and determined the quantity and chemical composition of the defects. By keeping the sample structure and the setup of the experiment unchanged, the significant role of the sample orientation with respect to the chamber was demonstrated. The effect was accounted for by the variation of the accessibility of the sample surface for the reactive species. Therefore, this effect can be used to control the degree of damage in each layer, resulting in differing numbers of defects present on each side of the sample.
Permanent Link: http://hdl.handle.net/11104/0319213