Papers by Ievgen P. Duboriz
P2.3.9 Polyaniline/poly(ethylene terephthalate) films as a sensing material in optical sensors for basic and acidic substances
Proceedings Imcs 2012, May 22, 2012
The new transparent polyaniline/poly(ethylene terephthalate) (PANI/PET) film sensor composites ha... more The new transparent polyaniline/poly(ethylene terephthalate) (PANI/PET) film sensor composites have been synthesized through aniline polymerization inside the surface layer of PET film followed by specific treatments. Ultimate PANI/PET films have a developed surface area; give strong, fast and reversible optical sensor responses to basic or acidic substances (dependently on the doping degree of PANI). In case of ammonia-air gas mixtures we demonstrated that the doped (PANI-HCl)/PET films give linear optical responses to ammonia gas in concentration ranges of 5-200 ppm and 200-750 ppm. The undoped PANI/PET films give linear optical response to formic acid in the concentration range of 150-750 ppm. These films are durable and can be used also as pH sensor in aqueous or organic media.
Poly(3-methylthiophene)–polyaniline couple spectroelectrochemistry revisited for the complementary red–green–blue electrochromic device
Electrochimica Acta, 2013
ABSTRACT
Sensor polymer composites based on polyaniline distributed inside surface layer of the polymer insulation matrix
Synthetic Metals, 2015
A behavior of polyaniline (PANI) composites with common polymers under different conditions is of... more A behavior of polyaniline (PANI) composites with common polymers under different conditions is often a result of a synergetic combination of properties of their components. In this work we consider specificity of such a combination in terms of both hydrogen bonding of PANI with a matrix polymer poly(ethylene terephthalate) (PET) and its influence on interactions of the composite PANI-HCl/PET films or dedoped PANI/PET films with alkaline and alkali metal halide aqueous solutions. In particular, it is found that PANI in emeraldine base (EB) state forms a EB complex with hydroxide anions, which is confirmed not only by a strong blue shift of the exciton band in UV-vis spectra of both the dedoped PANI/PET (up to 529 nm) and pure EB film (up to 579 nm) but also by reversibility of this shift and its independence on the alkali cation nature. Additional confirmations of existence of this complex were obtained by quenching of the PL emission of EB by OH − anions in the dedoped PANI/PET and IR spectra of EB film after its interaction with the alkali solution. Formation of this EB-OH − complex is shown to be due to hydrogen bonding of hydroxide anions with amine groups of the dedoped PANI (EB) backbone.
Sensors and Actuators B: Chemical, 2014
The new transparent polyaniline/poly(ethylene terephthalate) (PANI/PET) film sensor composites ha... more The new transparent polyaniline/poly(ethylene terephthalate) (PANI/PET) film sensor composites have been synthesized through aniline polymerization inside the surface layer of PET film followed by specific treatments. Ultimate PANI/PET films have a developed surface area; give strong, fast and reversible optical sensor responses to basic or acidic substances (dependently on the doping degree of PANI). In case of ammonia-air gas mixtures we demonstrated that the doped (PANI-HCl)/PET films give linear optical responses to ammonia gas in concentration ranges of 5-200 ppm and 200-750 ppm. The undoped PANI/PET films give linear optical response to formic acid in the concentration range of 150-750 ppm. These films are durable and can be used also as pH sensor in aqueous or organic media.
Spectroelectrochemical properties of poly(3-methylthiophene) (P3MT) and polyaniline (PANI) in apr... more Spectroelectrochemical properties of poly(3-methylthiophene) (P3MT) and polyaniline (PANI) in apro-tic acetonitrile medium have been revisited to better understand their specificity in a wide range of potentials and applicability in a complementary RGB electrochromic device. We find that kinetic limitations of electrochemical reduction of the polymers cause some distortions in their electronic absorption spectra, which are registered at different potentials. These limitations are very substantial for PANI and result in keeping quinoid units in the electrochemically reduced PANI structure. The complete PANI electrochemical reduction to leucoemeraldine state is realized only after 15 min of electrochemical polarization at −500 mV (vs. Ag/Ag +). Based on step-by-step polarization and with simultaneous registration of UV–vis spectra of P3MT, we have revealed additional isosbestic point at 765 nm appearing above 400 mV (vs. Ag/Ag +), which corresponds to transition of P3MT from polaron state to bipolaron one. Based on additivity of the spectroelectrochemical behavior of the polymers, spectral characteristic of light source and CIE standards we modeled RGB color palette of the complementary electrochromic device (ECD) of transmissive type. This palette is similar to colors of the real ECD prototype, in which electrochemically synthesized P3MT and PANI are working as an ensemble of electrochromic active layers.
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Papers by Ievgen P. Duboriz