TY - JOUR
T1 - Exceptional dielectric properties of chlorine-doped graphene oxide/poly (vinylidene fluoride) nanocomposites
AU - Wu, Ying
AU - Lin, Xiuyi
AU - Shen, Xi
AU - Sun, Xinying
AU - Liu, Xu
AU - Wang, Zhenyu
AU - Kim, Jang Kyo
N1 - Funding Information:
This project was financially supported by the Research Grants Council of Hong Kong SAR . Technical assistance from the Materials Characterization and Preparation Facilities (MCPF), Advanced Engineering Material Facility (AEMF) and Department of Electronic and Computer Engineering (Prof. Philip K.T. Mok) of HKUST is appreciated.
Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.
PY - 2015/8
Y1 - 2015/8
N2 - Herein, we report a facile method to significantly enhance the dielectric performance of reduced graphene oxide-based polymer composites. Addition of thionyl chloride into graphene oxide (GO) dispersion induces synergistic modifications of the structure, chemistry, charge carrier density and electrical conductivity of GO, as well as the interfacial interaction and phase of the surrounding matrix in the poly (vinylidene fluoride) (PVDF) composite. The composites reinforced with a very low reduced chlorinated GO (Cl-rGO) content of 0.2 vol% deliver an exceptional dielectric constant of 364 with a moderate dielectric loss of 0.077 at 1 kHz. These values are well contrasted with the corresponding properties of the neat PVDF polymer with a constant of 28 and a loss of 0.0029. Synergistic effects arising from chlorination are identified, including the much enhanced electrical conductivity of Cl-GO sheets by more than 3 orders of magnitude through introducing charge-transfer complexes, the improved interfacial interactions between the fillers and the PVDF matrix through hydrogen bonds, and the transformation of PVDF to β-phase with an inherently high dielectric constant due to dipolar interaction. The comparison with the literature data confirms superior dielectric performance of the present Cl-rGO/PVDF composites.
AB - Herein, we report a facile method to significantly enhance the dielectric performance of reduced graphene oxide-based polymer composites. Addition of thionyl chloride into graphene oxide (GO) dispersion induces synergistic modifications of the structure, chemistry, charge carrier density and electrical conductivity of GO, as well as the interfacial interaction and phase of the surrounding matrix in the poly (vinylidene fluoride) (PVDF) composite. The composites reinforced with a very low reduced chlorinated GO (Cl-rGO) content of 0.2 vol% deliver an exceptional dielectric constant of 364 with a moderate dielectric loss of 0.077 at 1 kHz. These values are well contrasted with the corresponding properties of the neat PVDF polymer with a constant of 28 and a loss of 0.0029. Synergistic effects arising from chlorination are identified, including the much enhanced electrical conductivity of Cl-GO sheets by more than 3 orders of magnitude through introducing charge-transfer complexes, the improved interfacial interactions between the fillers and the PVDF matrix through hydrogen bonds, and the transformation of PVDF to β-phase with an inherently high dielectric constant due to dipolar interaction. The comparison with the literature data confirms superior dielectric performance of the present Cl-rGO/PVDF composites.
UR - http://www.scopus.com/inward/record.url?scp=84927917106&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2015.02.074
DO - 10.1016/j.carbon.2015.02.074
M3 - Journal article
AN - SCOPUS:84927917106
SN - 0008-6223
VL - 89
SP - 102
EP - 112
JO - Carbon
JF - Carbon
ER -