Enhancing piezoelectricity of poly(vinylidene fluoride) nano‐wrapped yarns with an innovative yarn electrospinning technique

Abstract

Piezoelectric textiles have earned widespread acceptance in the application of wearable sensors owing to the stabilized energy conversion properties, high sensitivities and steady mechanical properties. In this study, silver-coated nylon yarns are used as a core with poly(vinylidene fluoride) nanofibers as a wrap material, forming piezoelectric wrapped yarns. The effect of spinning process parameters on the structure and crystallinity of the piezoelectric yarn is investigated through studying the mechanical properties, ⊎-phase ratio, crystallinity and piezoelectric properties. The results indicate that the crystallinity of the wrapped yarn reaches 49.57% in this experiment, and when used for piezoelectricity, the piezoelectric voltage constant can reach up to 0.4323 mV m N −1 . The wrapped yarns possess good softness and structural advantages of the sensing layer and thus show a great variety of application potential, such as in wearable and flexible sensors.

Polyvinylidene Fluoride-Based Gel Polymer Electrolytes for Calcium Ion Conduction: A Study of the Influence of Salt Concentration and Drying Temperature on Coordination Environment and Ionic Conductivity

“…To provide context, a few studies on the piezoelectric properties of PVDF have attributed this shoulder peak at 893 cm –1 to the β-phase of PVDF. 7 , 8 Yet, the GPE films herein are neither mechanically stretched nor subjected to a large electric field—steps known and applied previously to reorient the polymer crystals via induction of net dipoles along the PVDF chains. Also, in a previous study, Lee and coworkers have reported that the addition of CaF 2 particles to PVDF promoted the formation of polymer crystalline phases.…”

Recent advances in piezoelectric textile materials: A brief literature review

“…The main objective was to develop from two different techniques for coating the metallic electrode, by solution and torque spinning, a piezoelectric textile capable of generating an electric field. 78 Jun Sim 79 and Peng et al 80 invested in flexible nanogenerators from PVDF piezoelectric wires and silver-coated nylon fibers using techniques such as electrospinning to obtain nanofibers and nanowires with differentiated properties such as softness, flexibility, and constant piezoelectric voltage, with potential application as wearable sensors.…”

Hierarchically structured polyvinylidene fluoride core‐shell composite yarn based on electrospinning coating method to improve piezoelectricity

“…The APTAP composite yarn was prepared by using the abovementioned electrostatic spinning device to coat the PVDF nanofibers with APTA 2 yarn while the concentration of the PVDF solution is 9 wt% and the electron parameters are the same as the mentioned above. 36 Two main reasons for using PVDF nanofiber sealing layer are as follows: (1) it can generate the electricity with the help of PVDF. (2) It prevents short circuit between the inner and outer electrodes of the composite yarn as an insulating layer.…”