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|Measured parametre||Surface resistance R of graphene layer|
|Range of measured surface resistance R||0.1 Ω to 10000 Ω|
|Accuracy of measurement of the surface resistance of a graphene layer of thickness h||± 5%|
|Operational frequency||13 GHz|
|Dimensions of dielectric substrate||Lateral dimensions 10 mm x 10 mm, thickness <0.5 mm. Upon a special request it is possible to extend the lateral dimensions of the substrates.|
|Additional equipment needed to perform measurement||Vector Network Analyser|
|Measurement procedure||Resonant frequency and Q - factor of the empty resonator and the resonator with the graphene layer deposited on the dielectric substrate are measured. Dedicated software application (supplied with the resonator) is used to calculate the surface resistance R of the graphene layer. The electric conductivity of the graphene layer of thickness his calculated using the following formula:
σ = 1/(R*h)
The accuracy of calculation of the electric conductivity is proportional to the accuracy of the measurement of the thickness of the deposited graphene layer.
about the measurement method
|J. Krupka and W. Strupinski, Measurements of the sheet resistance and conductivity of thin epitaxial graphene and SiC films, Applied Physics Letters, vol. 96, 2010.
J. Krupka, W. Strupinski, and N. Kwietniewski, Microwave conductivity of very thin graphene and metal films, Journal of Nanoscience and Nanotechnology, Vol. 11, 1-5, 2011.