Stress effects on the impedance and ferroelectricity of PVDF- BiFeO3-MWCNT films using xanthan gum as dispersant

Composite films based on dispersions of bismuth ferrite (BiFeO3) in polyvinylidene fluoride (PVDF) matrixes were prepared in the presence of multiwalled-carbon-nanotubes (MWCNT), using xanthan gum (XG) as dispersant. Films were prepared by spin coating and characterized by infrared spectroscopy (FTI...

Full description

Saved in:
Bibliographic Details
Published in:Materials chemistry and physics 2022-07, Vol.286, p.126175, Article 126175
Main Authors: Sosa, Mariana D., Levy, Ivana K., Owusu, Francis, Nüesch, Frank, Opris, Dorina, Negri, R. Martín, Saleh Medina, Leila M.
Format: Article
Language:English
Subjects:
Bismuth
Bismuth ferrite
Bismuth ferrites
Constitutive models
Dielectric polarization
Dielectrics
Dispersants
Ferroelectricity
Impedance spectroscopy
Infrared spectroscopy
Multi wall carbon nanotubes
Piezoelectricity
Polyvinylidene fluorides
PVDF
Spin coating
Xanthan
Xanthan gum
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Composite films based on dispersions of bismuth ferrite (BiFeO3) in polyvinylidene fluoride (PVDF) matrixes were prepared in the presence of multiwalled-carbon-nanotubes (MWCNT), using xanthan gum (XG) as dispersant. Films were prepared by spin coating and characterized by infrared spectroscopy (FTIR) and electronic microscopy (SEM). SEM images showed that samples containing MWCNT and XG presented a uniform morphology with homogeneously dispersed fillers. Impedance spectroscopy analysis (ISA) up to 1 MHz and dielectric polarization curves (P-E loops) were recorded in the presence of applied unidirectional mechanical stresses (up to 10 MPa). The effect of stress on the dielectric permittivity and the relative remnant polarization was successfully described by a constitutive model, which assumes a linear dependence of the piezoelectric coefficient, d33, on the applied stress and the dielectric displacement. [Display omitted] •Addition of xanthan gum improves distribution of fillers in the matrix.•Dielectric constant (εr) presents exponential increase with stress.•Remnant polarization (Pr) shows quadratic increase with stress.•Piezoelectric coefficient (d33) is obtained from fittings of εr and Pr vs stress.•Successful fits of experimental data were obtained assuming linear dependence of d33 with applied electric field and stress.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2022.126175