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THz‐conductivity of CVD graphene on different substrates
Author(s) -
Gabriel Daniel,
Sempere Bernat,
Colominas Carles,
FerrerAnglada Núria
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552248
Subject(s) - polyethylene naphthalate , graphene , materials science , transmittance , raman spectroscopy , terahertz radiation , optoelectronics , polyethylene terephthalate , refractive index , substrate (aquarium) , spectroscopy , conductivity , optics , composite material , nanotechnology , chemistry , oceanography , physics , quantum mechanics , geology
Optoelectronic properties of CVD graphene are characterized over a wide frequency range: THz, IR, visible, and near‐UV. We used Raman spectroscopy to characterize the synthesized graphene films. All graphene layers were deposited on various substrates, some ones transparent or flexible, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), quartz, and silicon. Transmission Terahertz time‐domain spectroscopy (THz‐TDS) method, in the range from 100 GHz to 3 THz, is used to analyze the transmittance, sheet conductivity, and attenuation of graphene and the complex refractive index of substrates. From IR, near‐UV and visible spectroscopy we obtained the transmittance of the substrate and the sample at those frequency ranges, and we deduced the graphene transmittance on each substrate. We found that it is close to 97% in most cases.