EFFECT OF FECL4- INTERCALATION ON THE TRANSPORT-PROPERTIES OF A GRAPHITIZED POLYIMIDE FILM

The temperature variation of the thermal conductivity, the electrical resistivity, and the thermoelectric power of a graphitized polyimide f ilm have been measured in the temperature range 2 < T < 300 K. The eff ect of the electrochemical intercalation with FeCl4- ions has also bee n studied. The thermal conductivity measurements confirm the high degr ee of graphitization that may be obtained with polyimide films. They s how how intercalation increases the structural disorder and how the in tercalate substantially contributes to the thermal conductivity at low temperatures. The electrical-resistivity and thermoelectric-power mea surements reveal that the density of free carriers is about three time s lower in stage-2 FeCl4- solvated intercalation compounds obtained by an electrochemical way than in stage-2 FeCl3 compounds obtained by a classical synthesis method.