Enhancing the electroactive phases in freestanding flexible films of MoS ₂ / PVDF

Abstract

Freestanding, flexible, composite thin films of MoS2/PVDF have been synthesized using sol–gel method. Concentration of the fillers was optimized to tune the formation of electroactive phases (EA). The maximum amount of EA phases was obtained for 1 wt% of filler concentration. The as‐prepared samples were characterized to understand the effect of fillers on their microstructural, vibrational, and morphological properties. The fractions, of both β and γ phases, were calculated from infrared spectra. An enhancement of the EA phase from 28% to 83% was observed with the addition of 1 wt% of nanoflake fillers. The fillers were found to reduce the crystallinity of the host polymer matrix. Additionally, the morphology shows a change from spherulitic to fibrous nature with the appearance of nanoflakes on the surface for higher filler concentrations. The nanoflakes induce interfacial polarization. The intercalation of nanoflakes into the host matrix, leads to the observed trends.

Enhanced dielectric properties of freestanding, flexible, hydrophobic cellulose/poly(vinylidene fluoride) composite films

“…The FTIR spectra for the representative samples are shown in Figure 5A. Various characteristic peaks corresponding to the different phases of PVDF and cellulose were observed in the spectra and have been tabulated in Table 2 20,43,46–49 . The peaks corresponding to the α phase of PVDF were observed at peak positions ~487, ~611, ~763, and ~796 cm −1 .…”

“…Peaks corresponding to the PVDF and cellulose phases were observed in the spectra and have been tabulated in Table 2. 20,46 The peak corresponding to the α phase of PVDF was observed at $611 cm À1 and $796 cm À1 . Peaks at $812 and $840 cm À1 were observed for γ and β + γ phases of PVDF, respectively.…”

“…Adding different nanofillers to the polymer host matrix is an easy way to convert the non‐polar to the polar phase 18,19 . The bound charges on the surface of the nanofillers, polarize the polymer chains locally 20 . This modifies the dipole orientations of the host polymer matrices, thus, modulating the phases and influencing the dielectric properties.…”

“…18,19 The bound charges on the surface of the nanofillers, polarize the polymer chains locally. 20 This modifies the dipole orientations of the host polymer matrices, thus, modulating the phases and influencing the dielectric properties.…”

Poly(vinylidene fluoride)/molybdenum disulfide nanocomposite coatings: Studying the surface properties and corrosion protection

“…Due to its large specific surface area and its exfoliation ability in polymeric matrices, MoS 2 /PVDF nanocomposites were investigated in several studies. [30][31][32][33] Thakur et al [31] have synthesized MoS 2 /PVDF thin films using the sol-gel method and reported that the addition of MoS 2 significantly enhances the electroactive phases of PVDF. In another research, the piezoelectric property of PVDF was enhanced by incorporating MoS 2 via a liquid-exfoliation technique.…”