DNA-aligned cast film and its anisotropic electron conductivity

Abstract A DNA–lipid cast film was prepared, in which counter cations of DNA phosphates were replaced by cationic amphiphiles. The film is transparent, physically strong, and water-insoluble. DNA strands could be aligned in one direction by stretching the film. The aligned-DNA film showed a large anisotropic and ohmic electric current (10-5 S cm-1, A ⊥ /A ∥ =10 4 ) along DNA strands in the film.