Hostname: page-component-76fb5796d-dfsvx Total loading time: 0 Render date: 2024-04-28T08:45:35.032Z Has data issue: false hasContentIssue false
  • English
  • Français

Electrical transport properties of graphite sheets doped polyvinylidene fluoride nanocomposites

Published online by Cambridge University Press:  31 January 2011

Yu Chao Li ,
Robert Kowk Yiu Li  and
Sie Chin Tjong
Sie Chin Tjong*
Affiliation:
Physics and Materials Science, City University of Hong Kong, Kowloon Town, Hong Kong
*
a)Address all correspondence to this author. e-mail: aptjong@cityu.edu.hk
Get access

Abstract

Graphite nanosheets (GNs) were introduced into polyvinylidene fluoride (PVDF) via the solution mixing technique. The nanocomposites were then subjected to compression molding for electrical measurements. Solution mixing enabled homogeneous dispersion of GN within the PVDF matrix. The electrical transport behavior of such nanocomposites was studied by means of the impedance spectroscopy in a wide frequency range from 102 to 107 Hz. The results showed that the permittivity and conductivity of the composites are frequency dependent and well obeyed with the scaling law (ε′ ∝ ωu and σ′ ∝ ω−v) in the vicinity of percolation threshold (Φc ≈ 2.5 wt%). A large dielectric constant of 173 was observed in the PVDF/GN 2.5 wt% composites at 1 kHz.

Keywords

Dielectric propertiesElectrical propertiesEnergy storage
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 8: Materials for Electrical Energy Storage , August 2010 , pp. 1645 - 1648
Copyright
Copyright © Materials Research Society 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Kirkpatrick, S.Percolation and conduction. Rev. Mod. Phys. 45, 574 (1973)CrossRefGoogle Scholar
2.Stauffer, D., Aharony, A.Introduction to Percolation Theory (Taylor and Francis, Bristol, PA 1992)1181Google Scholar
3.Chen, G.H., Wu, C.L., Weng, W.G., Wu, D.J., Yan, W.L.Preparation of polystyrene/graphite nanosheet composite. Polymer (Guildf.) 44, 1781 (2003)CrossRefGoogle Scholar
4.Balberg, I.Tunneling and nonuniversal conductivity in composite materials. Phys. Rev. Lett. 59, 1305 (1987)CrossRefGoogle ScholarPubMed
5.Dang, Z.M., Wang, L., Yin, Y., Zhang, Q., Lei, Q.Q.Giant dielectric permittivities in functionalized carbon-nanotube/electroactive-polymer nanocomposites. Adv. Mater. 19, 852 (2007)CrossRefGoogle Scholar
6.Dang, Z.M., Wu, J.P., Xu, H.P., Yao, S.H., Jiang, M.J., Bai, J.B.Dielectric properties of upright carbon fiber filled poly(vinylidene fluoride) composite with low percolation threshold and weak temperature dependence. Appl. Phys. Lett. 91, 072912 (2007)CrossRefGoogle Scholar
7.Xu, J., Wong, C.P.Dielectric behavior of ultrahigh-k carbon black composites for embedded capacitor applicationsElectronic Components and Technology Conference (IEEE, Washington, DC 2005)18641869Google Scholar
8.Qi, L., Lee, B.I., Chen, S., Samuels, W.D., Exarhos, G.J.High-dielectric constant silver-epoxy composites as embedded dielectrics. Adv. Mater. 17, 1777 (2005)CrossRefGoogle Scholar
9.Chen, G.H., Weng, W.G., Wu, D.J., Wu, C.L.PMMA/graphite nanosheets composite and its conducting properties. Eur. Polym. J. 39, 2329 (2003)CrossRefGoogle Scholar
10.Chen, G.H., Weng, W.G., Wu, D.J., Wu, C.L., Lu, J.R., Wang, P.P., Chen, X.F.Preparation and characterization of graphite nanosheets from ultrasonic powdering technique. Carbon 42, 753 (2004)CrossRefGoogle Scholar
11.Li, Y.C., Li, R.K.Y., Tjong, S.C.Fabrication and properties of PVDF/expanded graphite nanocomposites. e-Polymers (Online) 019, 1 (2009)Google Scholar
12.Arbatti, M., Shan, X.B., Chen, Z.Y.Ceramic-polymer composites with high-dielectric constant. Adv. Mater. 19, 1369 (2007)CrossRefGoogle Scholar
13.Barrau, S., Demont, P., Peigney, A., Laurent, C., Lacabanne, C.DC and AC conductivity of carbon nanotubes-polyepoxy composites. Macromolecules 36, 5187 (2003)CrossRefGoogle Scholar
14.Nan, C.W.Physics of inhomogeneous inorganic materials. Prog. Mater. Sci. 37, 1 (1993)CrossRefGoogle Scholar