Abstract
PVDF based nanocomposite thin films have received great interest in energy harvesting, ferroelectric, pyroelectric and dielectric applications. In this novel study, we have exploited the electroactive β-phase (polar) formation in polyvinylidine fluoride–halloysite nanotube (PVDF–HNT) nanocomposite thin films fabricated by the spin coating technique for nonlinear optical applications. It was demonstrated that HNTs of different volume percentage loadings in the PVDF matrix were able to effectively nucleate PVDF in β (TTTT-all trans) conformation using X-ray diffraction and Infrared spectroscopy techniques. Closed aperture Z-scan measurements were performed for all the thin film samples with a CW laser as an excitation source at a wavelength of 632.8 nm. We observed a sign change in the nonlinear refractive index for PVDF. Nonlinear refractive index has a negative sign for pristine PVDF and a positive sign for HNT incorporated PVDF thin films. This anomalous behavior of change in the nonlinear refraction of PVDF is explained in our present work.
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Acknowledgements
The authors acknowledge the financial support from DST-FIST (Sanction No. SR/FST/PSI-172/2012). The authors also acknowledge the Department of Biosciences- SSSIHL for proving the FTIR characterization. We thank Prof. K. B. R. Varma and Dr. K. Vijay Sai for constantly guiding us. The authors offer their humble gratitude to the founder Chancellor of SSSIHL, Bhagawan Sri Sathya Sai Baba for providing excellent research facilities at Central Research Instruments Facility (CRIF).
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Viswanath, P., Rambhatla, P.V., Sai Kiran, P. et al. Third order nonlinear optical properties of β enhanced PVDF based nanocomposite thin films. J Mater Sci: Mater Electron 30, 12447–12455 (2019). https://doi.org/10.1007/s10854-019-01604-6
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DOI: https://doi.org/10.1007/s10854-019-01604-6