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Polythiophene (PTh) was prepared by the direct electrochemical synthesis in an ionic liquid ([BMIM]PF6) containing 0.1 mol/L thiophene by cyclic voltammetry,constant potential and constant current techniques.It is found that smooth and blue-green PTh films can be obtained at a potential of ca.+1.75 V ( vs.Ag/AgCl ) or a current of ca.1.5 mA cm-2 in the ionic liquid.