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Microwave surface impedance measurements on reduced graphene oxide.

Hao, L; Mattevi, C*; Gallop, J C; Goniszewski, S; Xiao, Y*; Cohen, L*; Klein, N* (2012) Microwave surface impedance measurements on reduced graphene oxide. Nanotechnology, 23 (28). 285706

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Here we report a non-contact method for microwave surface impedance measurements of reduced graphene oxide samples using a high Q dielectric resonator perturbation technique, with the aim of studying the water content of graphene oxide flakes. Measurements are made before, during and after heating and cooling cycles. We have modelled plane wave propagation of microwaves perpendicular to the surface of graphene on quartz substrates, capacitively coupled to a dielectric resonator. Analytic solutions are derived for both changes in resonant frequency and microwave loss for a range of water layer thicknesses. In this way we have measured the presence of adsorbed water layers in reduced graphene oxide films. The water can be removed by low temperature annealing on both single and multi-layer samples. The results indicate that water is intercalated between the layers in a multilayer sample, rather than only being adsorbed on the outer surfaces, and it can be released by applying a mild heating.

Item Type: Article
Keywords: Graphene, microwave surface impedance, high Q resonator
Subjects: Nanoscience
Nanoscience > Nano-Materials
Identification number/DOI: 10.1088/0957-4484/23/28/285706
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5516

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