Fabrication and Excellent Dielectric Performance of Exfoliated Graphite Sheets

Authors Girish M. Joshi1, Kalim Deshmukh1, P.K. Jain2

1 Polymer Nanocomposite Laboratory, Material Physics Division, School of Advanced Sciences, VIT University, Vellore-632014, TN, India

2 Center for Carbon Materials, International Advanced Research Center for Powder Metallurgy and New Materials, Autonomous Center of Department of Science and Technology, P. O. Balapur, Hydrabad-500 005, India.

Е-mail varadgm@gmail.com
Issue Volume 8, Year 2016, Number 1
Dates Received 04 December 2015; published online 15 March 2016
Citation Girish M. Joshi, Kalim Deshmukh, P.K. Jain, J. Nano- Electron. Phys. 8 No 1, 01022 (2016)
DOI 10.21272/jnep.8(1).01022
PACS Number(s) 81.05.ue, 72.80.Vp
Keywords Carbon materials (2) , Dielectrics (2) , Electrical properties (18) , Electron microscopy (19) .
Annotation In the present investigation, exfoliated graphite sheets were obtained from the thermo-chemical treatment of natural graphite flakes. In this process, the graphite expands almost 300-350 times of its original volume and takes the shape of worms. These worms can be pressed or rolled into any desired shape without any binder. The exfoliated graphite sheets show excellent electrical properties i.e. high dielectric constant (ε  6.374  107) and comparatively low dielectric loss (tanδ  138) across the frequency in the range 50 Hz to 30 MHz and temperature in the range 40-300 C. The products developed from exfoliated graphite can have very good sealing applications in industrial areas, especially for gaskets in the automobile industries.