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Morphological and Radio Frequency Characterization of Graphene Composite Films

Department of Information, Electronic and Telecom. Eng., ‘’La Sapienza’’ University, 00184 Roma, Italy
Department of Chemistry, Università di Genova, 16146 Genova, Italy
Department of Electronic and Telecom., Politecnico di Torino, 10128 Torino, Italy
Author to whom correspondence should be addressed.
Received: 16 April 2018 / Revised: 15 May 2018 / Accepted: 16 May 2018 / Published: 20 May 2018
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Graphene is a monolayer of carbon atoms which exhibits remarkable electronic and mechanical properties. Graphene based nano-materials have gained a lot of interest for many applications. In this paper, inks with three different graphene concentrations (12.5, 25, and 33 wt % in graphene) were prepared and deposited by screen printing. A detailed investigation of films’ surface morphology using Scanning Electron Microscope (SEM) and Atomic Force Microscopy (AFM) revealed that the graphene films present a homogeneous dispersion of the filler with a comparatively lower surface roughness at higher concentrations and negligible agglomerates. The films were then printed between copper electrodes on FR-4 substrate (trade name for glass-reinforced epoxy laminate material), commonly used in Radio Frequency (RF) circuits, and the measured scattering parameters analyzed. Finally, the reflection coefficient of a patch antenna, fabricated on FR-4 substrate with and without a stub loaded by a thin film were measured. The difference of the resonant frequency due to the different interaction between graphene flakes and polymer binders shows attractive features of functionalized graphene films for chemical and bio-sensing applications. View Full-Text
Keywords: graphene; surface morphology; radio frequency (RF); screen printing; thick films graphene; surface morphology; radio frequency (RF); screen printing; thick films

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Quaranta, S.; Miscuglio, M.; Bayat, A.; Savi, P. Morphological and Radio Frequency Characterization of Graphene Composite Films. C 2018, 4, 32.

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