Towards suppressing dielectric loss of GO/PVDF nanocomposites with TA-Fe coordination complexes as an interface layer

doi:10.1016/j.jmst.2018.06.007

Abstract

Abstract:

In this work, graphene oxide (GO) nanosheets with surface modification by Tannic and Fe coordination complexes (TA-Fe) were incorporated into poly(vinylidene fluoride) (PVDF) to prepare high constant but low loss polymer nanocomposites, and the effect of TA-Fe interlayer on dielectric properties of the GO@TA-Fe/PVDF nanocomposites was investigated. The results indicate that the dosage, mixing ratio, and reaction time of TA-Fe complexes have obvious influences on the dielectric properties of the nanocomposites. Furthermore, the TA-Fe interlayer significantly influences the electrical properties of GO@TA-Fe nanoparticles and their PVDF composites, and the GO@TA-Fe/PVDF composites exhibit superior dielectric properties compared with raw GO/PVDF. Dielectric losses of the GO@TA-Fe/PVDF are significantly suppressed to a rather low level owing to the presence of TA-Fe layer, which serves as an interlayer between the GO sheets, thus preventing them from direct contacting with each other. Additionally, the dynamic dielectric relaxation of the GO/PVDF and GO@TA-Fe/PVDF nanocomposites was investigated in terms of temperature.

Key words: Dielectric properties, Polymer nanocomposites, Interface layer, Relaxation

Ying Gong, Wenying Zhou, Zijun Wang, Li Xu, Yujia Kou, Huiwu Cai, Xiangrong Liu, Qingguo Chen, Zhi-Min Dang. Towards suppressing dielectric loss of GO/PVDF nanocomposites with TA-Fe coordination complexes as an interface layer[J]. J. Mater. Sci. Technol., 2018, 34(12): 2415-2423.

Figures/Tables 9

Fig. 1. (a) FT-IR spectra of TA, GO@TA-Fe and GO nanoparticles, (b) Raman spectroscope patterns of GO and GO@TA-Fe nanoparticles, and (c) Micrograph and elemental analysis image of GO@TA-Fe.

Fig. 2. SEM images of (a) GO, (b) GO@TA-Fe particles, (c) GO/PVDF composites, and (d) GO@TA-Fe/PVDF composites.

Fig. 3. TEM of GO@TA-Fe particles.

Fig. 4. Frequency dependence of (a) dielectric constant and (b) dielectric loss tangent of GO@TA-Fe/PVDF composites with different mole ratios of Fe and TA (The filler loading for the composites is 1?wt%).

Fig. 5. Frequency dependence of (a) dielectric constant and (b) dielectric loss tangent of GO@TA-Fe/PVDF composites with different concentration of TA-Fe (The filler loading for the composites is 2?wt%).

Fig. 6. Frequency dependence of (a) dielectric constant and (b) dielectric loss tangent of GO@TA-Fe/PVDF composites with different reaction time (The filler loading for the composites is 2?wt%).

Fig. 7. Frequency dependence of dielectric constant, dielectric loss tangent and electrical conductivity of GO@TA-Fe/PVDF (a, c, e) and GO/PVDF composites (b, d, f) with different GO@TA-Fe filler loading (The reaction time and TA-Fe concentration is 1?h and 0.5?g/L, respectively).

Fig. 8. Temperature dependence of (a) dielectric constant (b) dielectric loss tangent, and (c) the imaginary part of electric modulus of 1?wt% GO@TA-Fe/PVDF composites with varied frequency (The insets in three figures are dielectric properties for the 1?wt% GO/PVDF composites).

Table 1 Comparison of different dielectric properties of GO/polymers.

System	D_k/tanδ	Reference
GO@TA-Fe/PVDF (1?wt%)	110/0.12 (1?kHz)	This work
GO/PVDF (0.1?wt%)	35/0.64 (1?kHz)	[6]
rGO/PVDF (0.1?wt%)	52/1.12 (1?kHz)	[6]
BT-GO/PVDF (10?vol%)	20.8/0.047 (1?kHz)	[19]
BT-rGO/PVDF (10?vol%)	18.3/0.044 (1?kHz)	[19]
rGO-PVA/PVDF (2.2?vol%)	50/0.5 (1?kHz)	[23]
DGEBA-rGO/EP (1?wt%)	32/0.08 (1?kHz)	[29]
Ag-GO/P(VDF-HFP) (3?vol%)	65/<0.1 (100?Hz)	[31]
rGO/TiO₂/PVDF (10.9?vol%)	1741/0.39 (100?Hz)	[36]
GPTS-SiO₂@GO/PI (20?wt%)	79/0.25 (40?Hz)	[40]

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