Issue 64, 2015

Chemical grafting of multi-walled carbon nanotubes on metal phthalocyanines for the preparation of nanocomposites with high dielectric constant and low dielectric loss for energy storage application

Abstract

Polymer/CNT (carbon nanotube) composites with a high dielectric constant show great potential for energy storage applications. However, these CNT-based composites usually suffer from high dielectric loss and low breakdown strength, and pose difficulties in the tailoring of the dielectric constant. The integration of a CNT cladding insulator filler layer into the polymers provides an effective way to reach a low dielectric loss and a high breakdown strength. But the insulator layer could significantly reduce the dielectric constant, thereby decreasing the energy storage density of composites. Herein, we have designed and fabricated a novel candidate composed of a semiconductor NH2–CuPc coated multi-walled carbon nanotube (MWCNT-CuPc) through chemical grafting, in which dielectric CuPc layers can act not only as insulation barriers for suppressing leakage current, but also as semi-conductor layers to partially block electron motion. Thus the as-prepared composites exhibit not only a higher dielectric constant but also extremely decreased dielectric loss and excellent dielectric strength. Moreover, the dielectric properties of the composites can be easily tuned by tailoring the loading of MWCNT-CuPc. Our strategy provides a new pathway to achieve polymer/CNT composites with high dielectric performances for energy storage applications.

Graphical abstract: Chemical grafting of multi-walled carbon nanotubes on metal phthalocyanines for the preparation of nanocomposites with high dielectric constant and low dielectric loss for energy storage application

Associated articles

Article information

Article type
Paper
Submitted
27 Apr 2015
Accepted
04 Jun 2015
First published
05 Jun 2015

RSC Adv., 2015,5, 51542-51548

Author version available

Chemical grafting of multi-walled carbon nanotubes on metal phthalocyanines for the preparation of nanocomposites with high dielectric constant and low dielectric loss for energy storage application

X. Li, W. Xu, Y. Zhang, D. Xu, G. Wang and Z. Jiang, RSC Adv., 2015, 5, 51542 DOI: 10.1039/C5RA07641B

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