Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7891801 | Composites Part A: Applied Science and Manufacturing | 2015 | 27 Pages |
Abstract
Graphene with polydopamine (PDA) coating layer which displays promoted dispersibility in organic solvent was prepared through self-polymerization of dopamine onto graphene oxide (GO) and subsequent chemical reduction. The PDA coated reduced GO (RDGO) is homogeneously incorporated into poly(vinylidene fluoride) (PVDF) matrix, which exhibit a percolation threshold at 0.643Â wt%. The dielectric constant of PVDF with 0.70Â wt% RDGO increases to 176, about 17 times of neat PVDF. Importantly, the loss tangent is suppressed to 0.337 due to reduction of the concentration and mobility of ionizable carboxylic groups by PDA. The enhancement of dielectric constant probably rises from duplex interfacial polarization induced by graphene-semiconductor interface, and semiconductor-insulator interface. The composites displays advantages in excellent dielectric properties and good flexibility and processability guaranteed by low loading of RDGO, which is suitable for the development of dielectric materials for energy storage.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yuhan Li, Mao Fan, Kai Wu, Feilong Yu, Songgang Chai, Feng Chen, Qiang Fu,