PIEZOELECTRIC FIBERS AND DEVICES

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High piezoelectric polymer nanoribbons

Spontaneous high piezoelectricity in poly(vinylidene fluoride) nanoribbons produced by iterative thermal size reduction technique

M. Kanik, O. Aktas, H. S. Sen, E. Durgun, M. Bayindir, ACS Nano, volume 8, page 9311 (2014).

We produced kilometer-long, endlessly parallel, spontaneously piezoelectric and thermally stable poly(vinylidene fluoride) (PVDF) micro- and nanoribbons using iterative size reduction technique based on thermal fiber drawing. Because of high stress and temperature used in thermal drawing process, we obtained spontaneously polar γ phase PVDF micro- and nanoribbons without electrical poling process. On the basis of X-ray diffraction (XRD) analysis, we observed that PVDF micro- and nanoribbons are thermally stable and conserve the polar γ phase even after being exposed to heat treatment above the melting point of PVDF. Phase transition mechanism is investigated and explained using ab initio calculations. We measured an average effective piezoelectric constant as −58.5 pm/V from a single PVDF nanoribbon using a piezo evaluation system along with an atomic force microscope.

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