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- Title
Enhanced electroactive phase, dielectric properties and tuning of bandgap in Ho<sup>3+</sup> modified PVDF-HFP composite films.
- Authors
Chacko, Sobi K.; Rahul, M. T.; Raneesh, B.; Vinodan, Karthik; Jose, Jini K.; Kalarikkal, Nandakumar
- Abstract
Free-standing self-polarised films of Ho3+ modified Polyvinylidene fluoride co-hexafluoropropylene (PVDF-HFP) have been prepared using a simple and cost-effective solvent casting method. A study was initiated to bring out the impact of rare earth hydrated salt on the electroactive nucleation of PVDF-HFP. Holmium hydrated salt acts as an excellent filler to induce electroactive γ and β phases of PVDF-HFP. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy were used to authenticate the enhancement in the electroactive phases of PVDF-HFP. Furthermore, differential scanning calorimetric (DSC) measurements reveal an increase in the melting temperature, which indicates an enhancement in the polar β phase. An excellent enhancement in the dielectric constant value has been observed for Ho3+ incorporated composite films. The value reached 24 ~ (at 1 kHz), which is ~3 times greater than the pure polymer for the highest salt-loaded film. The effect of rare earth hydrated salt on the optical properties of the PVDF-HFP composite films has also been examined by analysing the direct and indirect band gaps of hybrid films. In addition, the ferroelectric properties of the prepared composites were also analysed by P-E measurements, and the composite films show remarkable improvement in polarisation. These multi-functionalities, such as the enhanced electroactive nature, flexibility lightweight, high value of dielectric constant, and the possibility for bandgap tuning make the prepared PVDF-HFP/Ho3+ cast films useful in piezo, photonic device applications.
- Subjects
DIELECTRIC properties; BAND gaps; HOLMIUM; FOURIER transform infrared spectroscopy; PERMITTIVITY; RARE earth metals; HYDRATES; ELECTROACTIVE substances
- Publication
Journal of Polymer Research, 2022, Vol 29, Issue 11, p1
- ISSN
1022-9760
- Publication type
Article
- DOI
10.1007/s10965-022-03318-6