Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Thin Films Tuesday Sessions
       Session TF-TuP

Paper TF-TuP7
Influence of the Transfer and Chemical Treatment of CVD(Chemical Vapor Deposition) Graphene for Flexible Transparent Electrodes

Tuesday, December 9, 2014, 4:00 pm, Room Mauka

Session: Thin Films Poster Session
Presenter: WooSeok Yang, Korea Electronics Technology Institute, Republic of Korea
Authors: Y. Kim, Korea Electronics Technology Institute (KETI), Republic of Korea
H. Kim, Korea Electronics Technology Institute
W.S. Yang, Korea Electronics Technology Institute, Republic of Korea
Correspondent: Click to Email
It has become critically important to develop reliable method to transfer chemical vapor deposited (CVD) graphene from its growth substrate to the target substrate without leaving undesired polymer residues on the graphene surface. Here, we have found that for the two different transfer method – wet transfer using poly(methyl metharcrylate) (PMMA) and dry transfer using polydimethylsiloxane (PDMS) as support layer, the amount of polymer residues and other impurities left on the graphene surface varies depending on the solvent used to remove those polymers. The exposure of the graphenes to different organic solvents such as acetone and chloroform resulted in different amount of polymer residues and impurities present on the graphene surface, which impact the electronic structure of the transferred graphene. It was found that the graphene obtained using the dry transfer method and acetone as solvent showed a 2D to G (I2D/IG) intensity ratio of 4.58 and a 2D peak full width-half maximum (FWHM) of 24.66, which was higher than that using the wet transfer method and chloroform as solvent. These results showed that graphene was less affected by the polymer residues and impurities for the dry transfer method rather than the wet transfer method. In addition, using acetone rather than chloroform as solvent in the dry transfer method led to less contaminated graphene.