PHASE-TRANSFORMATIONS OF ET POLYIODIDES LEADING TO SUPERCONDUCTING POLYMER IN-SITU COMPOSITES

Conducting in situ composites made by two-step reticulate doping of po lymers with ET polyiodides show several exceptional characteristics li ke high conductivity at low dopant amount, transparency and easiness o f production in a form of large-area, flexible films. The most interes ting finding is that the ET polyiodides forming the crystalline networ k can be transformed into the superconducting beta(r)-phase of ET2I3, yielding polymer composites showing the transitions to superconducting state at low temperatures. Systematic studies on the phase structure of the as-obtained films and on conditions controlling the transformat ion into the superconducting form were performed allowing optimization of the key parameters like composition, temperature, time and atmosph ere of annealing.