Fe3O4 decorated graphene/poly(vinylidene fluoride) nanocomposites with high dielectric constant and low dielectric loss. (8th February 2019)

• Record Type: Journal Article
• Authors: Li, Yuchao; Zhang, Dongmei; Wang, Shuangshuang; Zhan, Yanhu; Yin, Jie; Tao, Xuquan; Ge, Xiangcai; Tjong, Sie Chin; Liu, Hong-Yuan; Mai, Yiu Wing
• Is Part Of: Composites science and technology. Volume 171(2019)
• Page Start: 152
• Page End: 161
• Publication Date: 2019-02-08
• Subjects: A: Nano composites -- B: Electrical properties -- B: Magnetic properties; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2018.12.022
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: Percolative poly(vinylidene fluoride) (PVDF) composites with high dielectric constant and low dielectric loss was successfully achieved by incorporating reduced graphene oxide (rGO) decorated with magnetic iron oxide (Fe3 O4 ) (rGO@Fe3 O4 ) nano-fillers. The morphology, structure, thermal, electrical and magnetic properties of the composites were investigated systematically by using SEM, XRD, FTIR, TGA, DSC, impedance analyzer and magnetometer, respectively. The presence of a tiny amount of poly(sodium 4-styrene sulfonate) (PSSNa) facilitated the homogeneous distribution of rGO@Fe3 O4 nanoparticles and prevented the formation of an electrical conductive network within the PVDF matrix, resulting in an excellent dielectric performance of the rGO@Fe3 O4 /PVDF nano-composites. With 1.0 wt% rGO@Fe3 O4 incorporated in PVDF, the nanocomposite exhibited a high dielectric constant of 1297 and a low dielectric loss of 0.26 at 100 Hz. Percolation model revealed that such improvements could be attributed to the synergistic effect of the inorganic Fe3 O4 and rGO, whereby the electric charges were accumulated by forming many mini-capacitors in the bulk PVDF matrix. The structure-property behavior of the final nanocomposites was discussed.