Enhancement piezoelectricity in poly(vinylidene fluoride) by filler piezoceramics lead-free potassium sodium niobate (KNN)

Poly(vinylidene fluoride) (PVDF)/potassium sodium niobate (KNN)–based nanofibrous web: A unique nanogenerator for renewable energy harvesting and investigating the role of KNN nanostructures

“…The α and β phase are present in the PVDF nanofibrous web. When PVDF is transferred from α to β phase, the strength of the resultant dipole increases so that the piezoelectric response of the PVDF polymer also increases . In the nanocomposite fibrous web, the β phase mainly is enhanced by incorporation of KNN nanostructures into the polymer matrix, which is evident from the XRD results.…”

“…But ceramic particles are brittle and stiff so that they have a low breakdown strength and poor processability . Therefore, ceramic‐polymer composite provides a complementary effect of the high dielectric permittivity from the ceramics side and elasticity, flexibility, lightweight, and high breakdown strength from the organic polymers to get well piezoelectric effect . Therefore, by tailoring the relative amount of each constituent, it would be possible to design a composite material with excellent dielectric and mechanical properties…”

“…With the advent of nanotechnology, different nanostructured ceramic–based materials like, especially, lead zirconate titanate Pb (Zr,Ti)O 3 (PZT) and barium titanate (BaTiO 3 ) have been investigated to improve dielectric constant as a composite with organic polymers as a matrix due to their great potentials as better energy harvesters with higher volume efficiency. Besides, piezoelectric nanomaterials demonstrate excellent piezoelectric properties than their bulk form . But, in the conventional composite approach, a micron, submicron, or nanosized ceramic is incorporated into polymer film matrix to improve the dielectric constant, but this method needs higher loading that leads deterioration in mechanical, breakdown strength and processing properties.…”

“…Among the different lead‐free ceramic materials, potassium sodium niobate, (Na,K)NbO 3 (KNN) is considered to use as a nanopiezoelectric filler in this research work, because of their large piezoelectric response, ferroelectric properties, and higher curie temperature (>400°C) and also is suitable when a low cost and lightweight device is the requirement . Thus, our study is the first report in the scientific community to the fabricate a nanocomposite‐based electrospun flexible fibrous webs using PVDF as the polymer matrix and only 5% loading KNN in the form of high aspect ratio nanostructures (synthesized in the laboratory) as a piezoelectric filler, which also acts as a beta nucleating agent, apart from its piezoelectric contribution in the system.…”

Characterization and Antibiofouling Performance Investigation of Hydrophobic Silver Nanocomposite Membranes: A Comparative Study

“…β is responsible for the piezoelectric property, since the piezoelectricity will increase due to stronger dipole bonds during the β phase [ 32 , 33 , 34 ]. β phase development is mainly dependent on both nanoparticle size and content as well as the the interfacial bonding between the polymer and nanopaticles [ 35 ]. The XRD results verified that pure PVDF has a semicrystalline structure [ 36 , 37 , 38 ], which is a mixture of α and β fractions.…”