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Conductive polymers as a new type of thermoelectric material
Author(s) -
Toshima Naoki
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200208)186:1<81::aid-masy81>3.0.co;2-s
Subject(s) - polyaniline , materials science , thermoelectric effect , figure of merit , conductive polymer , doping , electrical resistivity and conductivity , thermoelectric materials , electrical conductor , polyaniline nanofibers , composite material , conductivity , polymer , thermal conductivity , optoelectronics , chemistry , electrical engineering , physics , polymerization , thermodynamics , engineering
Thermoelectric properties were investigated for the films of electrically conductive doped polyanilines. The thermoelectric performance, evaluated by thermoelectric figure‐of‐merit ( ZT = T ( S 2 σ ) / κ ), of various protonic acid‐doped polyaniline bulk films was found to depend on the electrical conductivity σ of the film. Thus, the higher the electrical conductivity, the higher the figure‐of‐merit is, because the thermal conductivity κ of polyaniline films does not depend on the electrical conductivity. Among the conductive bulk films of polyaniline, the highest figure‐of‐merit ( ZT = 1 × 10 −4 ) was observed for (±)‐10‐camphorsulfonic acid (CSA)‐doped polyaniline in an emeraldine form ( σ ‐ 188 S cm −1 ) at room temperature. The multilayered film, composed of electrically insulating emeraldine base layers and electrically conducting CSA‐doped emeraldine salt layers, exhibited 6 times higher ZT at 300 K than that of a bulk film of CAS‐doped polyaniline, showing the highest ZT value of 1.1 × 10 −2 at 423 K. Stretching of the CAS‐doped polyaniline film also increased the figure‐of‐merit of doped polyaniline films along the direction of the stretching.