Enhancement Research on Piezoelectric Performance of Electrospun PVDF Fiber Membranes with Inorganic Reinforced Materials

Abstract

The electrospun PVDF fiber membranes with the characteristics of light weight, strong signal and measurability, have been widely applied in the fields of environment, energy sensors and biomedical treatment. Due to the weakness of the piezoelectric and service properties, the conventional PVDF fiber membranes cannot meet the operating requirements. Based on the obtained optimal technological parameter of electrospun pure PVDF fiber membranes (P-PVDF) in the previous experiment (unpublished), three inorganic reinforced substances (AgNO3, FeCl3·6H2O, nanographene) were respectively used to dope and modify PVDF to prepare composite fiber membranes with the better piezoelectric performance. The morphology and crystal structure of the hybrid fiber membranes were observed and detected by scanning electron microscopy and X-ray diffraction, respectively. The results showed that the dopant could effectively promote the formation of β-phase, which can enhance the piezoelectric performance. The mechanical properties test and piezoelectric performance test exhibited that the static flexural strength, the elastic modulus, and the piezoelectric performance were improved with the addition of dopant. In addition, the influence on the addition of dopant and the doping modification mechanism were discussed. Finally, the conclusions showed that the minimum average diameter was obtained with the 0.3 wt% addition of AgNO3; the piezoelectric performance reached the strongest with the 0.8 wt% addition of FeCl3·6H2O; the mechanical properties were best with the 1.0 wt% addition of nanographene.

Electrospun PVDF-based piezoelectric nanofibers: materials, structures, and applications

“…[78][79][80] It was found that the piezoelectric qualities of PVDF ber lms could be substantially boosted by doping silver nitrate (AgNO 3 ). 81 Under a shaker power unit with a frequency of 500 Hz and an amplitude of 5 mm, the output voltage was increased from 0.27 V to 2 V by adding 0.3 wt% AgNO 3 . Adding BiCl 3 to PVDF nanober composite lms could also enhance their b-phase content.…”

Recent Advances in Wearable Tactile Sensors Based on Electrospun Nanofiber Platform

“…In another work, multiple functional materials can be used to achieve the synergistic effect on performance improvement. By using three kinds of inorganic doping materials of AgNO 3 , FeCl 3 •6H 2 O and nano graphene to modify the electrospun PVDF nanofiber mat, Li et al [109] prepared a composite piezoelectric nanofiber material (Figure 9b) and the voltage peak reached 1.8 V. It was tested that the dopant could effectively promote the formation of 𝛽 phase, thereby improving the piezoelectric properties. In addition, the static bending strength and elastic modulus were also enhanced.…”

“…b) A composite piezoelectric nanofiber material. Adapted with permission [109]. Copyright 2021, Coatings.…”

Processes of Electrospun Polyvinylidene Fluoride-Based Nanofibers, Their Piezoelectric Properties, and Several Fantastic Applications

“…Because the addition of conductive particles increases the surface charge density of the jet during electrospinning, the bending whipping effect of the jet is enhanced, the fiber is better stretched, and the content of β phase is relatively improved. Li et al [ 111 ] studied the piezoelectric properties of electrospun composite NFs with the addition of AgNO 3 , FeCl 3 ·6H 2 O, and modified graphene to PVDF. The relevant data are shown in Table 2 .…”

“…Reprinted with permission from Ref. [ 111 ], copyright 2021, MDPI. ( 4 ) the piezoelectric signals of the fiber membrane when different amounts of modified nanographene were added.…”