Peeling of Chemical Vapour Deposition Graphene Grown on Platinum and Copper foils using Alkaline Solutions for Reuseable Substrates

2015-04-10
Karamat, Shumaıla
Sonusen, Selda
Çelik, Ümit
Uysallı, Yiğit
Oral, Ahmet
Graphene, the wonder material, has gained worldwide scientific attention since its experimental existence in 2004. Its sp-2 bonded carbon atoms are arranged in a two dimensional honeycomb lattice which exhibits high intrinsic carrier mobility, transparency, and tensile strength. Chemical vapour deposition (CVD) is the most opted technique because of its potential for large area graphene growth. During CVD growth at high temperatures, the surface of the metal catalyst becomes rough due to surface reconstruction and graphene follow the underlying surface. It is advisable to utilize a delicate method for graphene transferring from the metallic catalyst to the appropriate substrate. The etchants like Iron Chloride and Iron Nitrate solutions were mostly used for etching metal catalyst which also leave metal residues and affect the graphene quality. Moreover, metal catalysts can be re-used several times for graphene growth and etching is not required for the graphene transferring procedure. In this work, we will present graphene growth on Pt and Cu foil using CVD method and introduced different alkaline salts suitable for peeling off graphene from metallic substrates using electrolysis process. Sodium hydroxide (NaOH), Potassium hydroxide (KOH), Lithium hydroxide (LiOH) and Barium hydroxide Ba(OH)2 alkaline solutions were electrolyzed. Then, hydrogen bubbles attached to the metal (Cu, Pt) cathode (graphene/Pt/PMMA stack) and as a result of that graphene layer peeled off from the substrate without any damage. It is observed that KOH and LiOH peeled off graphene very efficiently as compared to NaOH and Ba(OH)2. Furthermore, different characterizations techniques like optical microscopy, Raman spectroscopy, scanning electron microscopy (SEM) and atomic force microscopy (AFM) were performed to analyze transferred graphene. A detailed analysis has been made for the single layer and multilayer graphene domains.

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Citation Formats
S. Karamat, S. Sonusen, Ü. Çelik, Y. Uysallı, and A. Oral, “Peeling of Chemical Vapour Deposition Graphene Grown on Platinum and Copper foils using Alkaline Solutions for Reuseable Substrates,” presented at the MRS Spring Meeting (6-10 Nisan 2015), San Francisco, ABD, 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/86060.