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Tuning electronic and magnetic properties of graphene by surface modification

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4 Author(s)
Zhou, Jian ; Department of Advanced Materials and Nanotechnology, Peking University, Beijing 100871, People''s Republic of China ; Wu, Miao Miao ; Zhou, Xiao ; Sun, Qiang

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We have demonstrated that the electronic and magnetic properties of graphene sheet can be delicately tuned by surface modification. Applying an external electric field to a fully hydrogenated graphene sheet can unload hydrogen atoms on one side, while keeping the hydrogen atoms on the other side, thus forming a half-hydrogenated graphene sheet, where the unpaired electrons in the unsaturated C sites give rise to magnetic moments, coupled through extended p-p interactions. Furthermore, the electronic structure of the resulting half-hydrogenated graphene sheet can be further tuned by introducing F atoms on the other side, making a nonmagnetic semiconductor with a direct band gap.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 10 )