Abstract
Over the past decade, piezoelectric nanogenerator have attracted much attention to harvest mechanical energy from abundant resources in nature. Here, the ZnS microspheres is prepared by hydrothermal method and core-shell structured PANI/ZnS microspheres are synthesized by in situ polymerization method and then used as filler for the preparation of flexible [P(VDF-HFP)] based piezoelectric nanogenerator. The flexible P(VDF-HFP)/PANI-ZnS piezoelectric nanogenerator is prepared by Electrospinning technique. The core-shell PANI/ZnS composite improves the content of electroactive phase in [P(VDF-HFP)] and significantly improves the interfacial polarization between the PANI/ZnS particles and polymer matrix. Among all the samples, [P(VDF-HFP)]/2 wt% PANI-ZnS composite nanofibers exhibited the high piezoelectric peak-to-peak output voltage of 3 V compared with the neat [P(VDF-HFP)] (~ 120 mV). In addition, the high dielectric constant is observed for the [P(VDF-HFP)]/2 wt% PANI-ZnS composite nanofibers. These results implies that the fabricated flexible and efficient piezoelectric nanogenerator can be utilized for energy harvesting system.
Highlights
Due to the growing population and the rising demand for energy have motivated the development of few alternative power sources [1]
The typical preparation procedure of PANI-Zinc sulphide (ZnS) composites is as follow: 0.2 M aniline and 3 wt% percentage ZnS microspheres are dispersed into 50 mL of 0.01 M HCL solution and the mixture is stirred in an ice-bath for 2 h
According to Ostwald ripening mechanism, the small spheres are joined together and formed microsphere like structure during the hydrothermal processes. [P(VDFHFP)] composites nanofibers containing PANI coated ZnS microsphere is prepared by using electrospinning method as shown in Fig. 1b [18]
Summary
Due to the growing population and the rising demand for energy have motivated the development of few alternative power sources [1]. Poly(vinylidene difluoride) (PVDF) and its copolymers poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] and poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] finding interesting applications in actuators, sensors, energy harvesting and in the biomedical applications [6] This is due to their flexibility, lightweight and environmental compatibility. It has been reported that the polymer nanocomposites are limited by the internal resistance and relatively low short-circuit current [11] Conductive fillers such as graphene, polyaniline (PANI) and Carbon nanotube (CNT) has gained tremendous interest of researchers [12]. Mokhtari et al [14] developed piezoelectric nanogenerator based on PVDF containing different additives (ZnO, CNT, LiCl, PANI) They compared b-phase formation with different additives and found that the fillers are important for the bphase formation. The present work emphasizes the suitability of PANI coated ZnS microspheres for the preparation of [P(VDF-HFP)] nanofibers for energy harvesting applications
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