Procedure of removing polymer residues by post-annealing and the effect on electronic properties of transferred monolayer graphene grown by chemical vapor deposition method are investigated using X-ray photoelectron spectroscopy and Raman spectroscopy. It is found that breaking the polymerization backbone bond induces effective removal of poly(methyl methacrylate) on the graphene surface by depolymerization, and decomposition of the carboxyl functional group involves reducing the level of p-doping of the graphene, while the annealing process leads to an increase in defects, and consequently, to oxidation that transforms the graphene into p-doped material.
Bibliographical noteFunding Information:
This work was supported by the Korea Institute of Science and Technology (2E23273), (2E23150) and by the Converging Research Center Program conducted under the Ministry of Education, Science and Technology (2012K001280).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)