Dielectric properties of epoxy based composites containing graphite, graphite oxide and thermally exfoliated graphene oxide

Samaria, Bhumika; K. Srivastava, Avanish; S Chauhan, Virendra; Singh, Jitendra; Soni, Smita; Dhaka, Manoj K; K Shukla, Rajesh; Shukla, Anuj; Kumar, Narendra

doi:10.5185/amp.2018/838

Document Type : Research Article

Authors

Material Development Group, Defence Laboratory, Jodhpur 342011, India

https://doi.org/10.5185/amp.2018/838

Abstract

The discovery of graphene and subsequent development of graphene-based nanocomposites in different matrices including that in polymer is an important addition in the area of nanoscience and technology. This work deals with the studies on the dielectric properties of the nanocomposites of graphite, graphite oxide (GO) and thermally exfoliated graphene oxide (TEGO) in epoxy matrix. GO was synthesized using modified Hummers method which on heat treatment at ~300 ⁰C resulted into formation of graphene oxide termed as TEGO. The synthesized GO and TEGO were characterized using scanning electron microscope, energy dispersive X-ray, Fourier transform infrared spectrophotometer, Raman spectrometer, X-ray diffractometer, UV-Vis spectrometer, CHNSO analyzer, surface area analyzer, and dc electrical conductivity. Composites using graphite powder (GP), GO and TEGO individually were prepared in epoxy resin. The dielectric (dielectric permittivity, dielectric loss tangent) properties of composites were studied in frequency range of 8 - 12 GHz. Dielectric tangent loss (tand_e) vary from 0.02 for GP to 0.35 for TEGO. The effect of addition of GP to GO and TEGO composite on dielectric properties was investigated. The order of tand_evalues of composites is: TEGO > GP-TEGO > GP-GO> GO >GP. TEGO composite showed significant dielectric loss among the reported composites. The results thus indicate TEGO as filler for epoxy based composites to afford specific dielectric properties, especially as an alternative of much more expensive carbon nanotubes. Copyright © 2018 VBRI Press.

Keywords

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Dielectric properties of epoxy based composites containing graphite, graphite oxide and thermally exfoliated graphene oxide

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Volume 3, Issue 2 2018Pages 93-98

Volume 3, Issue 2
2018
Pages 93-98