The effect of the periodically aligned edge defects in graphene nano-ribbons (GNRs) on their electronic properties was analyzed by using density functional theory. The typical two structures of GNRs such as zigzag (ZGNR) and armchair (AGNR) structures were employed for the analyses. It was found that the electronic structures of GNRs changed significantly by their deformation caused by the applied mechanical stress. The electronic band structure of the armchair-type GNRs changed periodically as a function of the number of carbon atoms along their width direction. In addition, the peak amplitude of the band gap decreased monotonically with their width. The peak position also changed clearly by the introduction of the edge defects. Therefore, the electronic properties of GNRs vary drastically depending on their quality, in other words, the order of atom arrangement.
Transparent conductive films (TCFs) are widely used in various electronic devices. In addition, due to the excellent transparency (T=97.7%) and electrical conductivity by the effect of sp2 hybridized orbital, using graphene for the materials of TCFs is ideal. Typical method for manufacturing graphene TCFs is chemical vapor deposition (CVD) method. However, CVD method takes a high cost. On the other hand, liquid phase exfoliation (LPE) is the method for obtaining thin-layer graphene by peeling graphite in the organic solvent. In the LPE, method of making graphite oxide and peeling graphite is often used, but this method has problem that falling down conductivity due to structural defect in graphene. In this study, we used pressure homogenizer to obtain thin-layer graphene without using chemical treatment. Then, we made TCFs by using thin-layer graphene and evaluated some characteristics. Finally, we investigated transmittance and sheet resistance of the TCFs.