Temperature Raman Studies of Freestanding and Flexible Thin Films of CdS‐doped PVDF

Abstract

Temperature dependent Raman studies have been carried out on free standing thin films of (Poly(vinylidene fluoride)) incorporated with nano‐crystalline (Cadmium sulphide). Well‐defined signatures of both PVDF as well as CdS could be observed from the Raman spectra of the composite films. Peak shifts toward higher wavenumber for modes of CdS were observed at low temperature. Doping dramatically modulates the phases of polyvinyldene fluoride (PVDF). Microstructural studies revealed additional granular structure on incorporation of CdS nanoparticles into the otherwise fibrous PVDF. Energy Dispersive Spectroscopy (EDS) study confirms the elemental composition of the samples. The thermal conductivity of the composite film was obtained from Raman studies. POLYM. COMPOS., 40:2662–2667, 2019. © 2018 Society of Plastics Engineers

Deciphering TrFE Fingerprints in P(VDF-TrFE) by Raman Spectroscopy: Defect Quantification and Morphotropic Phase Boundary

“…Figure shows the obtained spectra, with the respective band assignment (with type, molecular group, and phases) and extracted band height and position for a selection of crystalline bands. Crystalline band assignment followed several seminal studies on Raman and FT-IR spectroscopy of PVDF homopolymer and P­(VDF-TrFE) copolymers. ,− In the literature, bands are typically assigned to specific phases (such as α, β, and γ phases of PVDF), which can lead to misinterpretations. Analysis should focus on the chain conformations associated with the observed modes, in this case, the all- trans , tttg , and tg conformations that are found in the different phases of PVDF-based polymers.…”

“…This analysis intends primarily to extract valuable information from the Raman spectra, by providing detailed vibration band labeling and relating the changes observed to the structure with respect to the TrFE content. In the literature, the chain conformation analysis has been predominantly made with FT-IR spectroscopy, with only a handful of works providing in-depth discussions of Raman spectra. ,− ,− Several of these works have performed crystalline band labeling based on theoretical spectral simulations. Simulations of Raman and FT-IR spectra identify the lattice modes of an ideal crystal, which calculates the contribution of an infinite crystal lattice.…”