A multielectrochromic copolymer based on pyrrole and thiophene derivatives

Silva, Ana Julia C.; Ferreira, Suzany M.F.; Santos, Diego de P.; Navarro, Marcelo; Tonholo, Josealdo; Ribeiro, Adriana S.

doi:10.1016/j.solmat.2012.03.024

Cited by 42 publications

(16 citation statements)

References 39 publications

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“…7,[31][32][33][34][35][36][37] In the present paper, PAni, chitosan and clay hybrid materials were prepared in hydrochloric acid (HCl) medium in order to investigate the electrochromic properties of these materials in aqueous acid medium and to quantify the color changes of each hybrid material using the Commission Internationale de l'Eclairage (CIE) principles, 38,39 aiming their application as active layers in ECDs.…”

Section: Introductionmentioning

confidence: 99%

Electrochromic Properties of Polyaniline-Based Hybrid Organic/Inorganic Materials

Silva¹,

Sarmento²,

Faez³

et al. 2016

Journal of the Brazilian Chemical Society

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Hybrid materials based on polyaniline (PAni) were obtained by in situ polymerization of aniline with chitosan and/or organically modified clay (nanomer I-24) in HCl. The samples were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and direct current (DC) electrical conductivity. Thin films of PAni, PAni-clay, PAni-chitosan and PAni-chitosan-clay were prepared by casting a solution of each sample in N-methyl-2-pyrrolidone (NMP) onto indium tin oxide (ITO)/glass electrodes and their electrochromic properties were investigated. It was observed color variation from transparent yellow in the reduced state (E = −0.2 V vs. Ag/AgCl), green in the intermediate state (E = 0.5 V) and dark blue in the oxidized state (E = 0.8 V) for all samples. The color changes of each material in function of the applied potential were tracked using the Commission Internationale de l'Eclairage (CIE) system of colorimetry, in which the color change was much more significant for PAni-clay film.Keywords: conjugated polymer, hybrid material, polyaniline, chitosan, organophilic clay IntroductionConjugated polymers have attracted the attention of academia and industries mainly because of their electrical, magnetic, and optical properties, which make them useful for applications in organic optoelectronic devices. Currently, the development of new hybrid materials based on conjugated polymers have afforded materials with excellent characteristics for application in organic light emitting diodes (OLEDs), 1,2 organic field effect transistors (OFETs), 3 organic solar cells (OSCs), 4 and electrochromic devices (ECDs). [5][6][7] Electrochromic materials based on conjugated polymers show many interesting properties such as multicolor, fast switching speed, flexibility and easy to optimize their properties through molecular tailoring. 8,9 Among the organic polymeric electrochromic materials, polyaniline (PAni) has been widely studied due to many advantageous properties including high optical contrast (∆%T), environmental stability, easy synthesis, as well as comparatively low cost.8 Furthermore, the high pseudocapacitance arising from the versatile redox reactions and its corresponding color changes make PAni promising candidate for electrochemical capacitors 10,11 and ECDs. 12,13 However, the difficulties in processing of PAni into films due to its very low solubility in most of the available solvents and the relatively poor mechanical properties decrease its performances and utilities in such applications.Despite PAni can be synthesized by chemical 14 or electrochemical 15 polymerization methods described in the literature, PAni films with good mechanical properties and adherence to a surface are not usually achieved from the conventional chemical methods of synthesis, which yield PAni as an insoluble and infusible bulky powder. 16 In order to increase the processability and mechanical properties of PAni, significant efforts have been done in preparation of blends based on PA...

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Section: Introductionmentioning

confidence: 99%

Electrochromic Properties of Polyaniline-Based Hybrid Organic/Inorganic Materials

Silva¹,

Sarmento²,

Faez³

et al. 2016

Journal of the Brazilian Chemical Society

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“…One of the most important method of the synthesis of conducting polymers is electropolymerization. The products of polymerization reactions are deposited on various electrodes, such as metallic electrodes, steel electrodes [3,14], carbon fibers [15], glassy carbon [9] or ITO [6,[16][17][18]. A significant effect on the electrical properties, morphology and the electrode coverage have the electrode material, the solvent [19], and concentration of the electrolyte [20] used in the synthetic route.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of new copolymer of pyrrole and 3,4-ethylenedioxythiophene synthesized by electrochemical route

Kadac

Nowaczyk

2015

Synthetic Metals

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“…A series of polypyrrole and polythiophene derivatives bearing nitro-and dinitro-substituents have been synthesized and characterized by our research group aiming their application in electrochromic devices (ECDs) [3,[23][24][25], fluorescent layers [26] or as material for energy storage [14]. In an earlier study, Welzel et al [19] synthesized two thiophene derivatives substituted with nitroand dinitro-groups and tried to electropolymerize these derivatives under standard conditions (such as TBAP/CH 3 CN), but they were not successful.…”

Section: Introductionmentioning

confidence: 99%