期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 134, 期 2-3, 页码 867-874出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.03.082
关键词
Composite materials; Chemical synthesis; Electrical characterization; Dielectric properties
资金
- Key Project of Chinese Ministry of Education [107023]
- Special fund of Co-construction of Beijing Education Committee
- City University of Hong Kong Strategic Research Grant [7008009]
- Fundamental Research Funds for the Central Universities [2010ZY46, 2011PY0181, 2011PY0180]
The morphology and microsctructure of layered graphene nanosheets/polyvinylidene fluoride (GNS/PVDF) nanocomposites fabricated by a facile and effective process are investigated. The graphene nanosheets were well dispersed and highly oriented in the matrix due to the unique preparation process. The morphology and microstructure were investigated. The results showed that the nanocomposites exhibited a much lower percolation threshold (1.29 vol%) than materials filled with carbon nanotubes. More importantly, a high dielectric constant of 63 (100 Hz) was obtained when the concentration of graphene was 1.27 vol% and it was 9 times higher than that of pure PVDF. The dielectric performance of the nanocomposites can be attributed to the homogeneous dispersion of GNS, well-aligned GNS, and resulting microcapacitor structure. An orientation mechanism for the well-aligned microstructure is proposed. (c) 2012 Elsevier B.V. All rights reserved.
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