Synthesis of single-layer graphene and studying oxidation behaviour of copper foil
- Resource Type
- Authors
- Rafei, Mouna
- Source
- Subject
- Other Physics Topics
Physical Sciences
Fysik
Annan fysik
- Language
- English
The ultimate aim of the current study is to investigate the electron transfer from copper (Cu) to single layer graphene through a thin Cu oxide layer. Therefore the project is divided into two main parts. In the first part, single layer graphene is synthesized with chemical vapour deposition technique on a Cu foil and the grown graphene is characterized by means of Raman spectroscopy and scanning electron microscopy (SEM). We tune different experimental parameters to grow high quality graphene. We show that a pre-annealing of the Cu foil, in Varigon environment, modifies the Cu crystal grain size and that modifies the growth dynamic of the graphene. Optimum annealing time in correlation with growth time results in high Ǵ/G ratio and a narrow FWHM of Ǵ band in Raman spectrum. The second part of the project focuses on controlling the surface oxidation of Cu foil with respect to the oxide layer thickness. The surface and cross section of the oxidized Cu foil is examined by SEM and the presence of oxide layer is confirmed via energy dispersive X-ray spectroscopy (EDS) analysis. We show that the surface roughness of the oxide layer can be minimized by controlling the oxidation condition with a minimum oxide layer thickness of 18 μm. In addition the grain size of the oxide layer is getting larger with increasing the oxidation temperature. Furthermore, the oxygen concentration in the oxide layer is controlled through a controlled reduction process which is confirmed via EDS analysis. XPS spectroscopy is also used for elemental analysis as well as revealing the chemical state of the Cu oxide.