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research-article

Monte Carlo Model for Piezoresistivity of Hybrid Nanocomposites

[+] Author and Article Information
Audrey Gbgaguidi

Aerospace Engineering Department Embry-Riddle Aeronautical University Daytona Beach, FL 32114
GBAGUIDA@my.erau.edu

Sirish Namilae

Aerospace Engineering Department Embry-Riddle Aeronautical University Daytona Beach, FL 32114
namilaes@erau.edu

Daewon Kim

Aerospace Engineering Department Embry-Riddle Aeronautical University Daytona Beach, FL 32114
kimd3c@erau.edu

1Corresponding author.

ASME doi:10.1115/1.4037024 History: Received February 09, 2017; Revised May 19, 2017

Abstract

Hybrid nanocomposites with multiple fillers like carbon nanotubes (CNT) and graphene nanoplatelets (GNP) are known to exhibit improved electrical and electromechanical performance when compared to mono-filler composites. We developed a two dimensional Monte Carlo percolation network model for hybrid nanocomposite with CNT and GNP fillers and utilized it to study the electrical conductivity and piezoresistivity as a function of nanocomposite microstructural variations. The filler intersections are modeled considering electron tunneling as the mechanism for electrical percolation. Network modification after elastic deformation is utilized to model the nanocomposite piezoresistive behavior. Systematic improvement in percolation threshold, electrical conductivity and piezoresistivity were observed in the hybrid nanocomposites, compared to mono-filler CNT nanocomposites. Parametric studies have been performed to show the effect of the GNP content, size, aspect ratio and alignment on the conductivity and piezoresistivity of hybrid CNT-GNP polymer composites.

Copyright (c) 2017 by ASME
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