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Open Access Thermal annealing of graphene to remove polymer residues

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The process of graphene transfer generally involves a polymer support. Thermal annealing of graphene monolayers transferred from Cu to SiO2/Si substrate has been investigated to remove polymethyl methacrylate (PMMA) residue. The results show that a clean graphene surface without any deterioration is difficult to obtain by conventional thermal annealing method owing to the reaction between the graphene and the carbon by-products from the residual polymers. Although a higher annealing temperature facilitates removal of the polymer residue on graphene surface, it may also increase the amount of amorphous carbon. In this work, we examine various annealing conditions to remove the polymer residue. Annealing under H2 ambience is effective in removing pendant functional groups in the polymer, yet increases the amorphous carbon also. In case of Ar ambience with high temperature, the polymer residue is efficiently removed without amorphous carbon.

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Keywords: AMORPHOUS CARBON; AR AMBIENCE; PMMA; THERMAL ANNEALING; TRANSFERRED GRAPHENE

Document Type: Research Article

Publication date: February 1, 2016

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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