Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 41, Issue 9, Pages 2439-2446Publisher
SPRINGER
DOI: 10.1007/s11664-012-2163-x
Keywords
Dielectrics; exfoliated graphite; polyimide; thin films
Categories
Funding
- Chinese Ministry of Education [107023]
- Hong Kong Polytechnic University [A-PJ46, A-PK30, A-SA11]
- Beijing City Education Committee
- Fundamental Research Funds for the Central Universities [2010ZY46, 2011PY0181, 2011PY0180]
Ask authors/readers for more resources
Exfoliated graphite/polyimide composite films were synthesized by in situ polymerization. The electrical and dielectric properties of composite films with different volume fraction of exfoliated graphite were investigated over the frequency range from 10(3) Hz to 3 x 10(6) Hz. The dielectric behavior of the composite films was investigated by percolation theory and a microcapacitor model. A low percolation threshold f (c) a parts per thousand 3.1 vol.% was obtained due to the high aspect ratio of the exfoliated graphite. Both the dielectric constant and alternating-current (AC) conductivity showed an abrupt increase in the vicinity of the percolation threshold. The ultralarge enhancement of the dielectric constant near and beyond the percolation threshold was due to Maxwell-Wagner-Sillars (MWS) interfacial polarization between the exfoliated graphite and polyimide and interface polarization between the composite film and electrode.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available