Cis-polyacetylene films have been synthetized and doped with iodine and antimony penta fluoride, using usual chemical techniques. Doping, leads, after saturation, to conductivity values of about 120 and 25 (Ω cm) -1 at room temperature, respectively for I2 and SbF 5 dopants. The E.S.R. of cis- and trans-, non-doped and doped (CH)x films has been studied. A qualitative analysis of the results allows a better understanding of the electronic properties of these extremely non homogeneous and highly conductive doped polymeric materials
ABSTRACT:Polyacetylene films strongly react with air, when conserved at room temperature and atmospheric pressure. We present here an experimental electron spin resonance (ESR) study on the variation of the linewidth and number of spins with time and temperature of cis-and trans-(CH)x films of different thicknesses. It is shown that this evolution is qualitatively and quantitatively different for the two isomers. The number of resonant spins increases with time with a characteristic time of the order of 8 hours in the case of the cis isomer. For the trans isomer, the number of resonant spins, which is an order of magnitude greater than the final value of the cis isomer, is remarkably constant with time while the linewidth and amplitude are not. In the light of these results, the origin and nature of the observed resonant spins are discussed.
2014 Nous avons dopé des films de polyacétylène au pentafluorure d'antimoine, et étudié leur conductivité électrique en fonction de la concentration en dopant. Des énergies d'activation en sont déduites et comparées avec celles obtenues par dopage à l'iode et au pentafluorure d'arsenic. Les résultats sont discutés sur la base d'un modèle de localisation du dopant dans le système. Abstract. 2014 Conductivity measurements are reported for polyacetylene films with various SbFS doping concentration. The activation energy behaviour is deduced and compared with previous results obtained with iodine and AsF5 doping. The results are discussed in terms of a qualitative model of the dopant ordening in the system.
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