| 초록 |
The electrical bandgap and thermal properties of sub-10nm graphene nano ribbons or superlattices are significantly differed from that of pristine graphene. The thermal conductivity and thermoelectric property of nanoscale graphene structure can be changed as edge-phonon scattering and band gap opening from confinement geometry, but the experimental measurements are not reported yet. In this study, we fabricated graphene nanomeshes (GNMs) with sub-10 nm geometry from the self-assembly of polystryene-block-poly(vinyl-2-pridine) (PS-b-P2VP) block copolymer thin film, and measured the thermal conductivity using optothermal Raman technique, the Seebeck coefficient, free carrier concentration and mobility, and electrical band gap from field effect transistor. The twisted graphene nanomeshes with 8-nm neck width showed remarkable thermal conductivity of ~78 W/m•K and Seebeck coefficient of -520µV/K because of quantum confinement and cross-plain coupling. |
