Study of enhanced dielectric permittivity of functionalize multiwall carbon nanotube-based polyvinylidene fluoride free-standing film forflexible storage device

We report the dielectric properties of flexible polyvinylidene fluoride (PVDF) and multiwall carbon nanotube (MWCNT) composite films prepared by solution casting route. The Fourier Transform Infrared Spectroscopy (FTIR) and Raman study engraved more dipolar phases within the carboxyl functionalize (f-MWCNT) embedded PVDF composite film. The dielectric permittivity enhances but the dielectric loss reduces for f-MWCNT embedded PVDF film compared to pristine MWCNT (p-MWCNT) embedded film. The dipolar interaction between -CF2 groups in PVDF and -COOH groups of CNT plays a crucial role in enhancing the dielectric constant. The resistance-voltage plot engraves the formation of the hysteresis loop of the nanocomposite film. The enhanced dielectric permittivity and appearance of a hysteresis loop in f-MWCNT embedded PVDF film can be utilized as the flexible storage device material. Apart from the above, the low value of skin depth of the film makes it a promising candidate for designing a flexible electromagnetic shielding membrane. (C) 2021 Elsevier B.V. All rights reserved.