CUED Publications database

Targeted removal of copper foil surface impurities for improved synthesis of CVD graphene

Murdock, AT and van Engers, CD and Britton, J and Babenko, V and Meysami, SS and Bishop, H and Crossley, A and Koos, AA and Grobert, N (2017) Targeted removal of copper foil surface impurities for improved synthesis of CVD graphene. Carbon, 122. pp. 207-216. ISSN 0008-6223

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Commercially available Cu foils are leading candidates as substrates employed for the generation of large-area graphene using chemical vapour deposition (CVD) techniques. However, the growth of high-quality graphene on Cu foils is often hindered by contamination particles, which will also be detrimental for many potential applications of graphene. Here we investigate the influence of typical substrate impurities on the formation of CVD graphene using as-received Cu foils of various purities from different suppliers and the same cleaned by popular methods. Analytical characterisation of the Cu foils revealed that contamination particles consist of calcium, aluminium, and silicon oxides. We show that contamination particles are present on foils with purities ranging between 99.8% and 99.9999% and that these particles influence the nucleation density, growth rate, and growth features of graphene domains. Based on our findings we propose new industrially applicable targeted cleaning procedures of immersion in purposely-selected HCl and KOH solutions to chemically dissolve the aforementioned impurities, bringing about improved growth of graphene.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:06
Last Modified: 08 Apr 2021 06:23
DOI: 10.1016/j.carbon.2017.06.075