TY - JOUR

T1 - Interactions in electrodeposited poly-3,4-ethylenedioxythiophene—tungsten oxide composite films studied with spectroelectrochemistry

AU - Efremova, Aleksandra O.

AU - Tolstopjatova, Elena G.

AU - Holze, Rudolf

AU - Kondratiev, Veniamin V.

N1 - Efremova, A.O.; Tolstopjatova, E.G.; Holze, R.; Kondratiev, V.V. Interactions in Electrodeposited Poly-3,4-Ethylenedioxythiophene—Tungsten Oxide Composite Films Studied with Spectroelectrochemistry. Polymers 2021, 13, 1630. https://doi.org/10.3390/polym13101630

PY - 2021/5/18

Y1 - 2021/5/18

N2 - Cyclic voltammograms and optical absorption spectra of PEDOT/WO3 composite films were recorded in order to identify possible interactions and modes of improved performance of the composite as compared to the single materials. Changes in the shape of redox peaks related to the W(VI)/W(V) couple in the CVs of WO3 and the composite PEDOT/WO3 films indicate electrostatic interactions between the negatively charged tungsten oxide species and the positively charged conducting polymer. Smaller peak separation suggests a more reversible redox process due to the presence of the conducting polymer matrix, accelerating electron transfer between tungsten ions. Electronic absorption spectra of the materials were analyzed with respect to changes of the shapes of the spectra and characteristic band positions. There are no noticeable changes in the position of the electronic absorption bands of the main chromophores in the electronic spectra of the composite film. Obviously, the interactions accelerating the redox performance do not show up in the optical spectra. This suggests that the existing electrostatic interactions in the composite do not significantly change the opto-electronic properties of components of the composite but resulted in the redistribution of fractions of polaron and bipolaron forms in the polymer.

AB - Cyclic voltammograms and optical absorption spectra of PEDOT/WO3 composite films were recorded in order to identify possible interactions and modes of improved performance of the composite as compared to the single materials. Changes in the shape of redox peaks related to the W(VI)/W(V) couple in the CVs of WO3 and the composite PEDOT/WO3 films indicate electrostatic interactions between the negatively charged tungsten oxide species and the positively charged conducting polymer. Smaller peak separation suggests a more reversible redox process due to the presence of the conducting polymer matrix, accelerating electron transfer between tungsten ions. Electronic absorption spectra of the materials were analyzed with respect to changes of the shapes of the spectra and characteristic band positions. There are no noticeable changes in the position of the electronic absorption bands of the main chromophores in the electronic spectra of the composite film. Obviously, the interactions accelerating the redox performance do not show up in the optical spectra. This suggests that the existing electrostatic interactions in the composite do not significantly change the opto-electronic properties of components of the composite but resulted in the redistribution of fractions of polaron and bipolaron forms in the polymer.

KW - Composite film

KW - Electronic absorption spectra

KW - Poly-3,4-ethylenedioxythiophene film

KW - Propylene carbonate solutions

KW - Spectroelectrochemistry

KW - Tungsten oxide

KW - ELECTROCHEMISTRY

KW - OXIDATION

KW - TUNGSTEN-OXIDE

KW - POLYPYRROLE

KW - PERFORMANCE

KW - spectroelectrochemistry

KW - tungsten oxide

KW - composite film

KW - ELECTROCHROMIC PROPERTIES

KW - CONDUCTING POLYMERS

KW - 4-ethylenedioxythiophene film

KW - electronic absorption spectra

KW - BIPOLARONS

KW - CHARGE STORAGE

KW - THIN-FILM

KW - propylene carbonate solutions

KW - poly-3

UR - http://www.scopus.com/inward/record.url?scp=85107016671&partnerID=8YFLogxK

U2 - 10.3390/polym13101630

DO - 10.3390/polym13101630

M3 - Article

AN - SCOPUS:85107016671

VL - 13

JO - Polymers

JF - Polymers

SN - 2073-4360

IS - 10

M1 - 1630

ER -