DOPING/DEDOPING PROCESS INDUCED WETTABILITY SWITCHING OF POLYANILINE-COATED CONDUCTIVE TEXTILE

Abstract

Polyaniline-coated conductive cotton textile(PANI/CCT) with superhydrophobic function was prepared via an in situ polymerization of aniline in the presence of trifluoroacetic acid(TFA) as the dopant and FeCl_3 as the oxidant.The SEM results present that the PANI nano-particles with diameter of about 200 nm evenly spread over on the surface of cotton fabrics with diameter of 10~20 μm.The structure characterizations further indicate that the cotton cellulose has certain doping function to the PANI,and there is a stronger chemical combination formed between them in the process of in situ polymerization than that in common coating.The contact angle of the PANI/CCT prepared at / = 0.34 is found as high as 160.5°.It is proposed that the supper-hydrophobic function of the PANI/CCT results from synergetic effect of co-existence of micro/nanostructures with a low surface energy of TFA.Moreover,wettability of the PANI/CCT is reversibly varied from super-hydrophobic to super-hydrophilic induced by a doping with TFA and dedoping with ammonia gas,exposing a promising property for preparing acidity-controlled wettability switching.