Ordering and stability in conducting polypyrrole

Cheah, K., Forsyth, M. and Truong, V. -T. 1998, Ordering and stability in conducting polypyrrole, Synthetic metals, vol. 94, no. 2, pp. 215-219.

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Title Ordering and stability in conducting polypyrrole
Author(s) Cheah, K.
Forsyth, M.
Truong, V. -T.
Journal name Synthetic metals
Volume number 94
Issue number 2
Start page 215
End page 219
Publisher Elsevier S.A.
Place of publication Basel, Switzerland
Publication date 1998-04-30
ISSN 0379-6779
Keyword(s) polypyrrole
ordering
xray diffraction
ion exchange
conductivity
thermal ageing
Summary X-ray diffraction (XRD) was employed to characterize electrochemically synthesized polypyrrole (PPy) films with 1,5-naphthalene disulfonate (1,5-NDS) counterions treated with simple acid and base. Results show that the as-synthesized film is amorphous with short-range ordering in the polymer backbone. This ordering is soon lost after thermal ageing at 150°C for 60 days and there is evidence of counterion degradation. Base treatment of the PPy/1,5-NDS films has similar effects leading to a complete loss of ordering in the polymer backbone and dedoping of the polymer. Acid treatment at high temperatures increases the ordering of the polymer backbone and results in the development of a secondary interdopant peak confirming that ion exchange has occurred. Conductivity of the PPy was also increased substantially. The enhanced ordering was maintained even after thermal ageing. Room-temperature acid treatment also results in improved ordering of the polymer as well as the counterion but the increase in conductivity is only marginal and most of the ordering is soon lost after thermal ageing. Increase in ordering of the polymer structure seems to lead to better conductivity, although not necessarily improved thermal stability.
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 ©1998, Elsevier Science S.A.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030087

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