Open AccessTerahertz conductivity of reduced graphene oxide films
Author(s) -
J. T. Hong,
K. M. Lee,
Byung Hee Son,
S. J. Park,
D. J. Park,
Jiyong Park,
Soonil Lee,
Y. H. Ahn
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.007633
Subject(s) - graphene , terahertz radiation , materials science , conductivity , optical conductivity , oxide , scattering rate , percolation (cognitive psychology) , optics , drude model , refractive index , terahertz spectroscopy and technology , scattering , optoelectronics , condensed matter physics , nanotechnology , physics , quantum mechanics , neuroscience , metallurgy , biology
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.