Journal
OPTICS EXPRESS
Volume 21, Issue 6, Pages 7633-7640Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.007633
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Funding
- Midcareer Researcher Programs [R01-2008-000-20702-0, 2011-0016173]
- PRC Program [2011-0030745]
- BSR program through National Research Foundation [2012R1A1A2039408]
- Korea Government (MEST)
- Joint Research Project of the Korea Research Council for Industrial Science and Technology (ISTK)
- National Research Foundation of Korea [2012R1A1A2039408] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2013 Optical Society of America
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