Structural, optical, and electrical properties of ferroelectric copolymer of vinylidenefluoride doped with Rhodamine 6G dye

Abstract

An effect of Rhodamine 6G dye introduced into vinylidenefluoride and tetrafluoroethylene copolymer on a number of its structural and electrical characteristics has been detected. It was shown that at film crystallization, the inserted dopant shifts the equilibrium distribution of isomers to the side of increasing concentrations of chains with the conformation of a planar zigzag. The dye introduced strongly increases ac conductivity, especially at high electric fields. The investigation of high voltage polarization under bipolar external field conditions shows slow switching of gigantic current which is observed at fields lower than coercive ones. The estimation of the charge density indicates the non-ferroelectric nature of the phenomenon observed. The analysis of the data shows that in the system, Maxwell–Wagner relaxation processes take place, which lead to the space charge formation in the polymer matrix. It is established that current switching observed must be attributed to the relaxation of the space charge field.

Optical and Electrophysical Properties of Vinylidene Fluoride/Hexafluoropropylene Ferroelectric Copolymer Films: Effect of Doping with Porphyrin Derivatives

“…Therefore, we begin the discussion with the films crystallized from the stored acetone, where, according to our previous data [ 35 , 36 ], the lowest degree of crystallinity is observed. As shown in our recent paper [ 37 ], the introduction of other dyes into the polymers under the study leads to additional structuring of the polymer matrix, so we may assume that the introduction of porphyrins into the selected copolymer would lead to a similar result. This is confirmed by the IR spectroscopy data.…”

“…We have shown previously [ 35 , 36 ] that the film structuring may be judged by the appearance of a doublet at 2850 and 2920 cm −1 in the IR spectra ( Figure 3 ). As follows from Table 1 , a certain fraction of VDF comonomer both in this [ 35 ] and in other copolymers [ 37 ] is attached along the chain in the “wrong” position, so that the protons of the C-H groups are far from the fluorine atoms. In this case, the valence vibrations of the mentioned groups are observed in the region of the frequencies where they are usually observed, for example, in polyethylene: 2850 and 2920 cm −1 .…”

Tuning of Morphological and Antibacterial Properties of Poly(3,4-ethylenedioxythiophene):Peroxodisulfate by Methyl Violet

“…The neat MV dye and the PEDOT:peroxodisulfate with higher MV concentration have the main peak located at 600 nm [ 33 ] with a shoulder around 560 nm originated in the optical transitions in the MV. The peak at 600 nm can be attributed to the molecularly dissolved dye, whereas the shoulder at 560 nm is related to the formation of H-aggregates of the dye [ 34 ]. With the dye concentration decreasing, the shoulder at 560 becomes suppressed and the PEDOT:peroxodisulfate band centered at 511 is increased.…”

Microwave Enthrakometric Labs-On-A-Chip and On-Chip Enthrakometric Catalymetry: From Non-Conventional Chemotronics Towards Microwave-Assisted Chemosensors

“…For example, surface acoustic waves can be generated by ferroelectric polymers such as PVDF, providing a reversible conversion of the acoustic field into the electric one (and vice versa), in particular, taking into account the features of cooperative mobility in the amorphous phase of ferroelectric polymers [237]. Considering the spectral response of the dyes introduced into the ferroelectric polymer matrix, registration of the physical and chemical processes occurring in such devices becomes possible due to the spectral shifts observed [238,239].…”