Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 22, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4922209
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Funding
- University Grants Commission (UGC), Government of India [C2/018450/UGC-PHY-III/12-13]
- Department of Science and Technology (DST), Government of India through DST-Nanomission project [SR/NM/NS-120/2010(G)]
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Here we report the microwave absorbing properties of three graphene derivatives, namely, graphene oxide (GO), fluorinated GO (FGO, containing 5.6 at. % Fluorine (F)), and highly FGO (HFGO, containing 23 at. % F). FGO is known to be exhibiting improved electrochemical and electronic properties when compared to GO. Fluorination modifies the dielectric properties of GO and hence thought of as a good microwave absorber. The dielectric permittivities of GO, FGO, and HFGO were estimated in the S (2 GHz to 4 GHz) and X (8 GHz to 12 GHz) bands by employing cavity perturbation technique. For this, suspensions containing GO/FGO/HFGO were made in N-Methyl Pyrrolidone (NMP) and were subjected to cavity perturbation. The reflection loss was then estimated and it was found that -37 dB (at 3.2 GHz with 6.5mm thickness) and -31 dB (at 2.8 GHz with 6mm thickness) in the S band and a reflection loss of -18 dB (at 8.4 GHz with 2.5mm thickness) and -10 dB (at 11 GHz with 2mm thickness) in the X band were achieved for 0.01 wt.% of FGO and HFGO in NMP, respectively, suggesting that these materials can serve as efficient microwave absorbers even at low concentrations. (C) 2015 AIP Publishing LLC.
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