| AVS 55th International Symposium & Exhibition | |
| Graphene Topical Conference | Tuesday Sessions |
| Session GR+TF+NC-TuA |
| Session: | Graphene: Characterization, Properties, and Application |
| Presenter: | C.-H. Chuang, National Taiwan University and National Synchrotron Radiation Research Center, Taiwan |
| Authors: | C.-H. Chuang, National Taiwan University and National Synchrotron Radiation Research Center, Taiwan C.-H. Chen, National Synchrotron Radiation Research Center, Taiwan H.-W. Shiu, National Synchrotron Radiation Research Center, Taiwan X. Gao, National University of Singapore M.B.H. Breese, National University of Singapore F. Watt, National University of Singapore S. Chen, National University of Singapore A.T.S. Wee, National University of Singapore M.-T. Lin, National Taiwan University, Taiwan |
| Correspondent: | Click to Email |
Graphene is referred to the honeycomb lattice of carbon atoms formed as a 2D flat single layer. It is also the building block to construct 0D fullerenes, 1D carbon nanotubes, and 3D graphite in graphitic materials. Similar to carbon-based materials, the strong C-C bonding with sp2 hybridization is stable and rigid in ambient atmosphere. In this letter, we introduce the simple method to modify its electronic character and use Scanning Photoemission Microscopy (SPEM) to study its electronic structure. The previous reports about ion- or proton-irradiated graphitic materials present the new physical and magnetic property, e.q. induced ferromagnetic behavior. The reasons are mainly related to the disorder lattice, the vacancy density, or hydrogen-absorbed carbon atoms in the graphene network. However, it is necessary to provide the evidence about electronic structure after proton irradiation. SPEM provides the spatial mapping image with different element and the chemical bonding environment of XPS at the individual location. As compared with the graphite, we can know the C 1s state of graphene is similar. After the proton-irradiated impact on the graphene, the irradiated area shows the broad FWHM of C 1s state and chemical shift of 0.4 eV up to the high binding energy. Besides, we find the satellite peak with binding energy 291 eV, related to π to π* state transition, is decreased after irradiation. The observed result in our irradiation sample may be due to the lattice reconstruction of C-C bond. Our experimental findings open up a new field in electronic manipulation in graphene-based electronics.