A non-contact graphene surface scattering rate characterization method at microwave frequency by combining Raman spectroscopy and coaxial connectors measurement

Nanomaterial in microwave and millimeterwave engineering research in China

“…A non-contact method is proposed to characterize the graphene at microwave frequency by combining Raman spectroscopy and Amphenol Precision Connector (APC-7) [24]. The CVD-grown graphene is transferred to the ring-shape Teflon substrate and characterized by Raman spectroscopy to estimate its doping density and the related Fermi energy.…”

“…In this way, the de-embedding process can be avoided. By combing the Kubo formula with our proposed circuit model, the scattering rate of graphene on Teflon substrate can be obtained and analyzed [24].…”

“…The diagram of experiment setup and the lumped equivalent circuit of monolayer graphene sandwiched between two APC connectors[24].…”

“…(a) S11 and (b) S21 measured for MLG, t-MLG, and d-MLG on Teflon samples; (c) Surface resistance and (d) surface conductivity extracted from measured S parameters[24].…”

Three-dimensional tunable frequency selective surface based on vertical graphene micro-ribbons

“…[14,15] Since the discovery of graphene, graphene-and carbon-based nanocomposites have been characterized [16] and studied to realize the tunable metasurfaces in a very wide band. [17][18][19][20] The modeling and design of graphene-based dynamically controllable metasurface are demonstrated in [17].…”