Effect of β-Chain Alignment Degree on the Performance of Piezoelectric Nanogenerator Based on Poly(Vinylidene Fluoride) Nanofiber

• Published in: Macromolecular research Vol. 30; no. 3; pp. 172 - 182
• Main Authors: Ibtehaj, Khatatbeh, Jumali, Mohammad Hafizuddin Hj, Al-Bati, Sameer, Ooi, Poh Choon, Al-Asbahi, Bandar Ali, Ahmed, Abdullah Ahmed Ali
• Format: Journal Article
• Language: English
• Published: Seoul The Polymer Society of Korea 01.03.2022; Springer Nature B.V; 한국고분자학회
• Subjects: Alignment; Chains; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Circuits; Complex Fluids and Microfluidics; Dimethylformamide; Fluorides; Lead free; Modulus of elasticity; Nanochemistry; Nanofibers; Nanogenerators; Nanotechnology; Open circuit voltage; Physical Chemistry; Piezoelectricity; Polymer Sciences; Polyvinylidene fluorides; Short circuit currents; Soft and Granular Matter; Vinylidene fluoride; 고분자공학; Young’s modulus; chain alignment degree; ferroelectric properties; dipole re-orientation; self-poled PVDF nanofibers; highperformance flexible PNG
• ISSN: 1598-5032; 2092-7673
• DOI: 10.1007/s13233-022-0020-1

This work demonstrated the effect of the β -chain alignment degree on piezoelectric nanogenerator (PNG) performance. A simple, safe and low-cost fast-centrifugal spinning technique was used to produce self-poled poly(vinylidene fluoride) (PVDF) nanofiber. PNG based on acetone-prepared PVDF fibers, with high β -chain alignment, generated output open-circuit voltage ( V OC ) and short-circuit current ( I SC ) five times higher than the film counterpart. In addition, the fibers showed a remarkable increase in β -chain alignment degree as the ratio of N,N -dimethylformamide (DMF) solvent increased. The optimum nanofiber with the highest β -chain alignment degree, β -fraction and piezoelectric charge coefficient of 0.93, 91.8% and -120 pC.N − was obtained, respectively. PNG based on the optimum fiber displayed the highest V OC , I SC and power density of 14 V, 1.4 µA and 6.7 µWcm −2 , respectively. This performance is greater than any PNG made from electrospun PVDF fiber. The excellent performance of the fabricated PNGs was strongly related to the high alignment degree of β -chains parallel along the fiber axis. In addition, due to low Young’s modulus (1.63 MPa) of the optimum fibers, the related lead-free PNG is sensitive to small movements and can be used in wearable and implanted medical devices.