Abstract
The crystal structure of polyvinylidene fluoride (PVDF) polymer could be tailored for preparing a high-performance piezoelectric sensor. Herein, the preferential orientation of the carbon nanotubes (CNTs) along the longitudinal axis of the PVDF nanofibers was achieved by adjusting the electrospinning conditions, even in the highly concentrated samples, leading to the β-phase content of more than 90%. Increasing the weight percentage of the well-oriented CNTs from 0 to 1.25, the α- to β-phase transformation entirely occurred and the output voltage increased ~ 70% from 4 to 6.8 V, respectively. At higher CNT content, the sensing performance rapidly decreased because of the sudden increase in dielectric constant and dielectric loss diagrams. The formation of the proper interfacial interactions between the uniaxially oriented CNTs and the PVDF chains, which made a perfect coaxial structure, causes an ~ 12% increase in crystallinity, ~ 100% increase in elastic modulus, and ~ 100% increase in dielectric constant. The piezoelectric sensor also showed excellent stability under a long period of 1800 cycles.
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The authors wish to thank Tarbiat Modares University and the Iran Nanotechnology Initiative Council (INIC) for their support.
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Sharafkhani, S., Kokabi, M. Enhanced sensing performance of polyvinylidene fluoride nanofibers containing preferred oriented carbon nanotubes. Adv Compos Hybrid Mater 5, 3081–3093 (2022). https://doi.org/10.1007/s42114-022-00565-5
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DOI: https://doi.org/10.1007/s42114-022-00565-5