期刊
NANOTECHNOLOGY
卷 31, 期 36, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab96e6
关键词
transparent electrodes; graphene; cyclo-olefin polymers; Raman mapping; terahertz time-domain spectroscopy; mid-infrared spectroscopy
资金
- CNR-BAS triennial (2019-2021) bilateral project 'Transparent electrodes for advanced liquid-crystal tunable devices'
- European Union COST Action 'Future communications with higher-symmetric engineered artificial materials' [CA18223]
- Italy and China of the Italian Ministry of Foreign Affairs and International Cooperation (MAECI)
- National Natural Science Foundation of China (NSFC)
- Hellenic Foundation for Research and Innovation (H.F.R.I.)
- procurement of high-cost research equipment grant [HFRI-FM17-2086]
- Corsortium GARR
- Bulgarian National Science Fund [KPi-06-H-28/8]
We demonstrate graphene on flexible, low-loss, cyclo-olefin polymer films as transparent electrodes for terahertz electro-optic devices and applications. Graphene was grown by chemical vapor deposition and transferred to cyclo-olefin polymer substrates by the thermal release tape method as layers on an approximate area of 4 cm(2). The structural and electromagnetic properties of the graphene samples as well as their spatial variation were systematically mapped by means of mu Raman, terahertz time-domain and mid-infrared spectroscopy. Thanks to the small thickness and very low intrinsic absorption of the employed substrates, both high transmittance and conductivity were recorded, demonstrating the suitability of the technique for the fabrication of a new class of transparent and flexible electrodes working in the terahertz spectrum.
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