Synthesis, characterization, and thermoelectric properties of a conducting copolymer of 1,12-bis(carbazolyl)dodecane and thieno[3,2-b]thiophene

  • Yue R
  • Chen S
  • Liu C
 et al. 
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Abstract

Poly(1,12-bis(carbazolyl)dodecane-co-thieno{[}3,2-b]thiophene)
(P(2Cz-D-co-TT)), a conducting copolymer was synthesized
electrochemically by direct anodic oxidation of
1,12-bis(carbazolyl)dodecane (2Cz-D) and thieno{[}3,2-b]thiophene (TT)
in boron trifluoride diethyl ethrate containing 30% (vol)
dichloromethane. As-formed copolymers exhibited high redox activity and
reversibility and good conductive properties. The emitting property of
as-formed copolymer was different from those of respective homopolymers,
and could be tuned by changing the initiate monomer feed ratios.
Thermoelectric investigations revealed that the electrical
conductivities of as-obtained copolymer films were between 0.1 and 0.3 S
cm(-1) at ambient temperature, lower than that of
polythieno{[}3,2-b]thiophene (PTT) (0.42 S cm(-1)) but two orders of
magnitude higher than that of poly(1,12-bis(carbazolyl)dodecane)
(P2Cz-D) (10(-3) S cm(-1)). The Seebeck coefficients and the power
factors of the copolymers were improved with different degrees compared
with those of PTT and P2Cz-D. As expected, the thermoelectric
performance of PTT and P2Cz-D were both improved through
copolymerization, which may be beneficial to the exploration and
investigation of novel organic thermoelectric materials.

Author-supplied keywords

  • Conducting polymers
  • Electrochemical copolymerization
  • Polycarbazole
  • Polythiophene
  • Thermoelectric material

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