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Materials Congress 2018
Page 80
Nano Research & Applications
ISSN: 2471-9838
W o r l d C o n g r e s s o n
Materials Science & Engineering
A u g u s t 2 3 - 2 5 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
T
he effect of reduced graphene oxide (rGO) contents on the dielectric and ferroelectric properties of poly (vinylidene
fluoride)-barium titanate (PVDF-BTO) nanocomposites have been investigated. The nanocomposites were obtained by the
polymerization of the graphene oxide (GO) into the PVDF matrix to achieve an insulator-conductor-insulator sandwich structure,
and BTO was then carefully added to the composite. Four different flexible piezoelectric films were prepared by varying the rGO
contents into the PVDF matrix, followed by the drop wise addition of BTO solution. For clarity, the samples were labelled as PB
(PVDF-BTO-RGO 0 wt%.), PRB1 (PVDF-BTO-RGO 0.1 wt%.), PRB2 (PVDF-BTO-RGO 0.3 wt%.), and PRB3 (PVDF-BTO-RGO 0.5 wt.%.).
Field emission scanning electron microscopy (FESEM) analysis was carried out to check the surface morphology and to observe
the uniform distribution of BTO NPs into PVDF matrix. Additionally, X- diffraction (XRD) pattern was taken in order to realize the
rGO effect on the crystallinity of the PVDF. It was believed that rGO sheets may attracts the polymer chain and aligning it into one
direction due to the free charges on its basal plane. Furthermore, the electrical data for the as-synthesized piezoelectric sheets
was also measured. The as prepared optimum nanocomposite (PRB2) sample showed high dielectric constant (98 @ 1MHz) and
relatively low loss (0.081 @ 1MHz). Furthermore, the nanocomposite exhibit energy density of 4.5 J/cm
3
at an electric field of
50 MV/m, which was calculated from the P-E loop using , where E and P refer to the electric field and polarization, respectively.
Considering these results, it was estimated that as-synthesized piezoelectric-ferroelectric material can be a promising building
block for its application in energy harvesting and high frequency capacitors.
usmanyqb3@gmail.comEnhancement in the dielectric properties of the
PVDF-BTO nanocomposite with the employment of
rGO contents
Usman Yaqoon and Hyeon Cheol Kim
University of Ulsan, Republic of Korea
Nano Res Appl 2018, Volume: 4
DOI: 10.21767/2471-9838-C4-018