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 FeCl3 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 ［TFA］/［ANI］ = 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.