Investigation and Modeling of the Electrical Conductivity of Graphene Nanoplatelets-Loaded Doped-Polypyrrole

Polymers

Neeraj Kumar¹  SuprakasSinha Ray¹  Rotimi Sadiku²  Yskandar Hamam³  Oladipo Folorunso³ 

[1] Centre for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre, Council for Scientific and Industrial Research, Pretoria 0001, South Africa;Department of Chemical, Institute of NanoEngineering Research (INER), Metallurgy and Material Engineering, Tshwane University of Technology, Pretoria 0001, South Africa;Department of Electrical Engineering, French South African Institute of Technology (F’SATI), Tshwane University of Technology, Pretoria 0001, South Africa;

关键词: graphene;    polypyrrole;    electrical conductivity;    models;    hybrid;    percolation;   

DOI  :  10.3390/polym13071034

来源: DOAJ

【 摘 要 】

In this study, a hybrid of graphene nanoplatelets with a polypyrrole having 20 wt.% loading of carbon-black ($\mathrm{HGPPy}.{\mathrm{CB}}_{20\%}$), has been fabricated. The thermal stability, structural changes, morphology, and the electrical conductivity of the hybrids were investigated using thermogravimetric analyzer, differential scanning calorimeter, X-ray diffraction analyzer, scanning electron microscope, and laboratory electrical conductivity device. The morphology of the hybrid shows well dispersion of graphene nanoplatelets on the surface of the $\mathrm{PPy}.{\mathrm{CB}}_{20\%}$ and the transformation of the gravel-like $\mathrm{PPy}.{\mathrm{CB}}_{20\%}$ shape to compact spherical shape. Moreover, the hybrid’s electrical conductivity measurements showed percolation threshold at 0.15 wt.% of the graphene nanoplatelets content and the curve is non-linear. The electrical conductivity data were analyzed by comparing different existing models (Weber, Clingerman and Taherian). The results show that Taherian and Clingerman models, which consider the aspect ratio, roundness, wettability, filler electrical conductivity, surface interaction, and volume fractions, closely described the experimental data. From these results, it is evident that Taherian and Clingerman models can be modified for better prediction of the hybrids electrical conductivity measurements. In addition, this study shows that graphene nanoplatelets are essential and have a significant influence on the modification of $\mathrm{PPy}.{\mathrm{CB}}_{20\%}$ for energy storage applications.

【 授权许可】

Unknown