Electrochemistry, morphology, thermoelectric and thermal degradation behaviors of free-standing copolymer films made from 1,12-bis(carbazolyl)dodecane and 3,4-ethylenedioxythiophene

Abstract

A copolymer based on 1,12-bis(carbazolyl)dodecane (2Cz-D) and 3,4-ethylenedioxythiophene (EDOT) was electrochemically synthesized in dichloromethane containing 0.1-M tetrabutylammonium tetrafluoroborate. Cyclic voltammetry, Fourier-transform infrared, morphological and elemental analyses confirm that the resultant polymer is a copolymer rather than a composite or a blend of the two homopolymers. The copolymer exhibits good redox activity and high electrochemical stability. In contrast with powdered poly(3,4-ethylenedioxythiophene) (PEDOT), the copolymer formed in this study exists in a free-standing film state, and it has a higher thermal stability and better mechanical properties. Moreover, the copolymer films emit blue light, depending on the monomer feed ratios. The thermoelectric properties of the copolymer films were also investigated. Because the 2Cz-D/EDOT feed ratios were different, the electrical conductivities of the obtained copolymer films were improved to varying degrees compared with that of the poly(1,12-bis(carbazolyl)dodecane) (P2Cz-D) film. The highest obtained electrical conductivity was 0.6 S cm À1 , four orders of magnitude higher than that of P2Cz-D (2.7Â10 À5 S cm À1 ). The Seebeck coefficients of the copolymer films were also modified compared with that of P2Cz-D. All of these enhanced properties will be beneficial to the potential applications of these materials in polymer optoelectronics or as organic thermoelectric materials.

Electrochemical and chemical investigations of the co-polymers of 3-aminobenzenesulfonic acid with aromatic amines for their application in electrochromic devices

“…To investigate the electrochemical polymerization behavior of the poly(AA) and the effect on the copolymerization process [37][38][39], the CV for aromatic amine and poly(3-ABSA-co-AA) films was obtained by potential sweeping in a blank 0.2 M PTSA medium. Figure 4a shows the first peak value at 0.166 V for poly(AA) and Fig.…”

Preparation and characterization of polyacrylate functionalized polythiophene films

“…The R-TE-PAA and TE-PAA precursors in THF showed the similar absorption with a peak at 231-232 nm (Figure 9a&d). Generally, absorption at longer wavelength in the spectra usually indicates higher conjugation length [55]. The valence band-conduction band (π~π*) transition of doped R-PTE-PAA (Figure 8b) was shifted to 350 nm, which suggested that the conjugated chain had been extended.…”

Organic Thermoelectrics: Materials Preparation, Performance Optimization, and Device Integration

“…The power factor is typically less than 1 mW/m-K 2 . [113][114][115] Lé vesque et al reported high TE performances for poly(2,7carbazole) (PC), polyindolocarbazole (PIC), and a series of their derivatives (B) Power factor as a function of the oxidation level. 24 Seebeck coefficient (filled triangles), electrical conductivity (open triangles), and corresponding power factors (red squares).…”