title: Terahertz conductivity of reduced graphene oxide films.
abstract: We performed time-domain terahertz (THz) spectroscopy on reduced graphene oxide (rGO) network films coated on quartz substrates from dispersion solutions by spraying method. The rGO network films demonstrate high conductivity of about 900 S/cm in the THz frequency range after a high temperature reduction process. The frequency-dependent conductivities and the refractive indexes of the rGO films have been obtained and analyzed with respect to the Drude free-electron model, which is characterized by large scattering rate. Finally, we demonstrate that the THz conductivities can be manipulated by controlling the reduction process, which correlates well with the DC conductivity above the percolation limit.
authors.affiliation: Department of Physics and Division of Energy Systems Research, Ajou University, Suwon 443-749, South Korea.
authors.forename: J T
authors.initials: JT
authors.lastname: Hong
authors.forename: K M
authors.initials: KM
authors.lastname: Lee
authors.forename: B H
authors.initials: BH
authors.lastname: Son
authors.forename: S J
authors.initials: SJ
authors.lastname: Park
authors.forename: D J
authors.initials: DJ
authors.lastname: Park
authors.forename: Ji-Yong
authors.initials: JY
authors.lastname: Park
authors.forename: Soonil
authors.initials: S
authors.lastname: Lee
authors.forename: Y H
authors.initials: YH
authors.lastname: Ahn
mesh_terms: D004553:Electric Conductivity; D006108:Graphite / Q000737:chemistry*; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D055053:Terahertz Radiation
chemical_list: D010087:Oxides; D006108:Graphite