Effect of CoCl2–BaCl2 fillers on morphology, dielectric constant and conductivity of PVDF composite for pressure sensing application

Abstract

This present study focuses on the effect of addition of CoCl 2 -BaCl 2 fillers on the b phase formation and dielectric constant in the PVDF composite films. The pristine and filler based PVDF films were prepared using solution casting technique. XRD analysis were carried out to investigate the crystalline structure in the prepared composite films. The surface morphology of the films were observed using SEM indicating the formation of agglormated structures. The UV-Vis absorption spectrum was obtained to investigate the effect of filler concentration on the optical band gap. The decrease in optical band gap with increase in filler concentration was confirmed from Tauc plot. The incorporation of filler significantly improved the ac conductivity. The dielectric study reveals the increase in value of dielectric constant from 10.8 to 42.3 as the filler content increased from 0 to 12 wt%. A pressure measurement set up was developed and voltage output was measured from the PVDF thin film sensor for variation in applied pressure.

Structural, thermal, and dielectric properties of porous PVDF/Li4Ti5O12 nanocomposite membranes for high‐power lithium‐polymer batteries

“…Generally, the decrease of ε ′( ω ) with increasing frequency is due to the nonavailability of excess ions diffusion in the applied field direction. Consequently, the charge carriers have a lower contribution to the dielectric property 46 . It is also observed that, in the investigated frequency range, ε ′( ω ) has higher values in all PNC films than the pure PVDF, as shown in Figure 6B(a‐d).…”

Integrated Bending Actuation and the Self‐Sensing Capability of Poly(Vinyl Chloride) Gels with Ionic Liquids

“…[ 4,5 ] Even though some integration of actuation and sensing has been achieved in the dielectric elastomer [ 6–9 ] and piezoelectric materials, [ 10,11 ] the development of EAPs with integration of actuation and sensing still have a big challenge for simultaneously achieving high‐pressure sensitivity and high actuation performances. For example, the strategies of improving elastomers conductivity of elastomers are usually beneficial for improving pressure‐sensing performance, [ 12,13 ] however are unfavorable for improving actuation performances. [ 14 ]…”

“…conductivity of elastomers are usually beneficial for improving pressure-sensing performance, [12,13] however are unfavorable for improving actuation performances. [14] The dielectric polymer gel (DPG) is an electronic type of electroactive elastomers which has many advantages than dielectric elastomers due to low modulus and high dielectrics such as lower driving voltage, degree of various actuation freedoms and high actuation strain etc.…”

Studies on the transformation process of PVDF film from α to β phase by uniaxial stretch

“…So, it is necessary to convert α-phase into β-phase effectively. Basically, the mainly methods including mechanical stretching [4,23,26,27], crystallization under high pressure [28], applying electric eld [29], electrospinning [29], copolymerization with tri uoroethylene (TrFE) [30,31], adding nucleating llers to the PVDF matrix [32][33][34], and so on [35,36]. One of the most effective methods is to change the conformation of PVDF by stretching [37,38].…”