Order–disorder transitions in poly(3,4-ethylenedioxythiophene)

Winther-Jensen, Bjorn, Forsyth, Maria, West, Keld, Andreasen, Jens Wenzel, Bayley, Paul, Pas, Steven and MacFarlane, Douglas R. 2008, Order–disorder transitions in poly(3,4-ethylenedioxythiophene), Polymer, vol. 49, no. 2, pp. 481-487.

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Title Order–disorder transitions in poly(3,4-ethylenedioxythiophene)
Author(s) Winther-Jensen, Bjorn
Forsyth, Maria
West, Keld
Andreasen, Jens Wenzel
Bayley, Paul
Pas, Steven
MacFarlane, Douglas R.
Journal name Polymer
Volume number 49
Issue number 2
Start page 481
End page 487
Publisher Elsevier Ltd.
Place of publication Oxford, England
Publication date 2008-01-21
ISSN 0032-3861
1873-2291
Keyword(s) PEDT
DSC
XRD
Summary The commonly held perception that high conductivity in conducting polymers is linked to a high level of π-stacking order in the material is shown here to be of lesser importance in highly conducting poly(3,4-ethylenedioxythiophene) (PEDT), which has been prepared by chemical vapour phase polymerisation. Despite the fact that there is a highly energetic phase transition about 130 °C (110 J/g), and that this transition corresponds to a loss of the long-range π-stacking as observed in grazing angle XRD, the conductivity remains unchanged beyond the transition and only decreases by a factor of two when heating to above 200 °C. The XRD data suggest that order in two dimension remains above the phase transition measured by DSC and this order is sufficient to maintain a high level of electronic conductivity. Furthermore, as the ligand on the iron salt used in the synthesis is varied, the conductivity of the PEDT varies over two orders of magnitude. These phenomena cannot be explained by different degree of doping or crystallinity and it is proposed that the iron salt has an ordering effect during the vapour phase polymerisation.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Elsevier Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030290

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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