Thermoelectric Polymers for Smart Clothing

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Authors
  1. Leclerc, M.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Laval Univ, Quebec Que (CAN) Faculte des Sciences et de Genie
Abstract
Novel poly(2,7-carbazole)s have been synthesised with the aim of applying them as promising thermoelectric materials. Electronic band structure calculations performed on poly(2,7-carbazole) derivatives have revealed good potential for these materials in thermoelectric applications. Moreover, it was recently found for poly(2,7-carbazole) derivatives that the nitrogen atom is oxidized prior to the backbone and the charge is then very localized. This characteristic is very favourable to produce large Seebeck coefficients. Another class of (2,7-carbazole)-based polymers having a bithiophene unit and structuring units were synthesised to get highly conducting polymers. The presence of structuring units lead to π-stacking, which is very important for charge transport. Also alkyl units have been included in these polymers as side chains to impart solubility in common organic solvents. A few more polymers with carbazole with bi- or terthiophene units as well as 2,7-carbazoles with bithiophene (electron rich unit) and diketopyrrolopyrrole (DPP) (electron deficient) units have been synthesised and tested for their thermoelectric efficiency. Among all the polymers tested, the polymer PCDTBT proved to be very efficient in giving a high value of electrical conductivity of the order of 500 S/cm. The polymers were chemically doped with FeCl3 and their thermoelectric parameters were evaluated at different doping levels. Different types of dopants have been also tested but it wa

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Report Number
DRDC-ATLANTIC-CR-2009-076 — Contractor Report
Date of publication
01 Sep 2009
Number of Pages
54
DSTKIM No
CA033773
CANDIS No
533189
Format(s):
Electronic Document(PDF)

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