27 March 2018 Numerical and experimental investigation of matrix effect on sensing behavior of piezoresistive hybrid nanocomposites
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Abstract
Nanocomposites exhibit remarkable electromechanical properties and have potential applications in sensing and actuation. In this work, carbon nanotubes (CNTs) - epoxy nanocomposites are fabricated with the addition of graphite nanoplatelets (GNPs). An improvement in piezoresistivity is observed with the combination of CNTs and GNPs, compared to the use of only CNTs, which indicates the formation of an efficient hybrid conductive networks for strain and electrical transfer in the materials. We investigate the effect of static mechanical loading on the electrical sensing performance of the nanocomposites. The inter-particle distances between the fillers change in the event of applied loading, which leads to a modification of the CNT-GNP hybrid percolated network and hence results in a change of the electrical conductivity. This phenomenon is exploited to use the hybrid composites as strain sensors. Specifically, different matrix materials are tested to investigate their effects on the mechanical and sensing performance of the nanocomposites. In addition, numerical simulations are performed to model the strain sensing performance of the nanocomposites. The effect of the type of matrix on the sensing performance of the nanocomposites is predicted and compared with the experimental results.
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Muhammad Anees, Audrey Gbaguidi, Daewon Kim, Sirish Namilae, "Numerical and experimental investigation of matrix effect on sensing behavior of piezoresistive hybrid nanocomposites", Proc. SPIE 10598, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018, 1059809 (27 March 2018); doi: 10.1117/12.2296715; https://doi.org/10.1117/12.2296715
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