Modeling and experimental verification of graphene co-planar waveguide transmission lines

Z. Awang; M. H. Kara; M. H. Amir; A. Awang Teh; M. R. Mahmood

doi:10.1117/12.929503

27 September 2012 Modeling and experimental verification of graphene co-planar waveguide transmission lines

Z. Awang, M. H. Kara, M. H. Amir, A. Awang Teh, M. R. Mahmood

Proceedings Volume 8462, Carbon Nanotubes, Graphene, and Associated Devices V; 84620A (2012) https://doi.org/10.1117/12.929503
Event: SPIE NanoScience + Engineering, 2012, San Diego, California, United States

Abstract

In this paper we report the use of graphene for microwave integrated circuit transmission lines. Multi-layered graphene films were grown on Si wafers coated with SiO₂ and Ni using chemical vapour deposition. A modified procedure to etch graphene used in our work involved the use of Au on top of graphene which formed defects by breaking bonds of the underlying graphene, but our modified procedure enabled the etching process to be performed with the presence of PMMA masking layer. The etchant was made of 3HCl:HNO₃:8H₂O. Co-planar transmission lines of various widths and lengths were constructed on graphene to ensure compatibility with microwave wafer probes used in the measurements. The lines and the underlying SiO₂ layer were modeled using CST Microwave Studio electromagnetic simulator. The centre conductor width was 30 μm, while the spacing varied from 30 to 100 μm. The graphene parameters were subsequently subtracted out from measurements by curve-fitting the experimental results with simulation. Low frequency I-V measurements revealed conductivity of the order of 2.89 × 10⁷ S/m, but scattering parameter measurements of the samples conducted over 1 to 20 GHz revealed much lower conductivity, an effect which we think was the result of poor quality thermally grown SiO₂ substrates used in this experiment.

Citation Download Citation

Z. Awang, M. H. Kara, M. H. Amir, A. Awang Teh, and M. R. Mahmood "Modeling and experimental verification of graphene co-planar waveguide transmission lines", Proc. SPIE 8462, Carbon Nanotubes, Graphene, and Associated Devices V, 84620A (27 September 2012); https://doi.org/10.1117/12.929503

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available