The influence of humidity on the electrical conductivity of iodine doped polyphenlacetylene

Synthetic Metals, 41-43 (1991) 89

8c

THE INFLUENCE OF H U M I D I T Y ON THE ELECTRICAL C O N D U C T I V I T Y OF IODINE DOPED P O L Y P H E N Y L A C E T Y L E N E . M.Asdente*,

V. Ottoboni - CISE - via Reggio Emilia 39-Segrate

Milano O~dy) A. Furlani, M.V. Russo - Chemistry D e p a r t m e n t - U n i v e r s i t y "La Sapienza" - P.le Aldo Moro 5 - 00185 Rome

~y)

Practical a p p l i c a t i o n s of organic conducting p o l y m e r s are limited owing to their u n s t a b i l i t y to oxygen and humidity found that undoped and FeCI

(1,2). R e c e n t l y we have

doped p o l y p h e n y l a c e t y l e n e

(PPA) and p o l y i s o p r o -

3 penylacetylene

(PIA) are stable in the air and their conductivity varies li-

nearly with the relative humidity

(3).

Now we have investigated the b e h a v i o u r of iodine doped PPA, w h i c h was p r e p a r e d in the p r e s e n c e of Rh catalysts ously doped with iodine

(lO-75%w/w)

(4). Samples of PPA were homogene-

in THF solution.

Conductivity measure-

ments were carried out on p r e s s e d pellets with the usual two Doints nrcbe ~y~tem.

All the s~m;3]es examined increase their conductivity in the

nr~aen-

ce of water vapour and decrease their conductivity in vacuum. The increase/ decrease of c o n d u c t i v i t y can be r e p e a t e d in several cycles. The behaviour of various samples is dependent on the iodine concentration.

The influence of

temperature and of other e n v i r o n m e n t a l conditions was also examined.

REFERENCES i) K. Seeger, W.D. Gill, T.C. Clarke, G.B. Street Solid State comm. 28, 873 (1978) 2) H. Naarmann, N. T h e o p h i l o u Synth. Met. 22, 1 (1987) 3) A. Furlani, M.V. Russo, A.M. Cianciusi, ti, A. D'Amico

F. Bruno, R. Mercuri, A. Paolet-

Chemtronics 3, 239 (1988) 4) A. Furlani,

C. Napeletano,

M.V. Russo, A. Camus, N. M a r s i c h

J. Polym. Sci. Part. A Polym. Chem. 27, 75 (1989)

* P r e s e n t address:

Istituto di Scienze F a r m a c o l o g i c h e - F a c o l t & di F a r m a c i a

U n i v e r s i t & degli Studi - ~ia B a l z a r e t t i 9 - 20129 M i l a n o

Elsevier Sequoia/Printed in The Netherlands