Numerical simulation on Piezoresisitivity of CNF/CNTs hybrid nanofiber
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2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. In this work, the piezoresistivity of carbon nanofiber (CNF) / carbon nanotubes (CNTs) hybrid nanofiber is modeled by combining a multi-resolution two-dimensional (2D) resistor network model and finite element analysis based particle strain analysis. The model predictions are then compared with those measured experimentally. The CNFs are modeled as a composite of conductive graphitic domains distributed in non-conductive amorphous carbon matrix. The simulated microstructure of CNF/CNTs is generated by growing non-penetrable particle with random initial position and orientation angle, representing the highly ordered graphitic phase in CNF/CNTs. Electrical resistance of hybrid structure is calculated based on the formed conductive network composed of intra-particle resistances and inter-particle resistances. Particle strain distribution with 0.5 % global strain is obtained by applying FEA method. Piezoresistivity of the hybrid CNF/CNTs is calculated through using electrical resistances of the deformed geometry of hybrid structure under global strain. The results point to the significant influence of conductive particle volume fraction on the overall piezoresistivity of whole nanofiber, due to the changed contribution of inter-particle tunneling resistance to overall resistance. The simulation elucidates the microstructure-piezoresistivity relationship in the hybrid nanofiber, which provides a clear path for further improving piezoresistivity of CNF/CNTs hybrid nanofiber through controlling its fabrication process.
