Asymmetric Arrangement of Monolayer in the Multilayer Films of 2-Hydroxy-4,4'-dihexyloxy-azobenzene

Multilayer films of 2-hydroxy-4,4'-dihexyloxy-azobenzene (HAB) on silicon substrates have been studied with atomic force microscopy, temperature-dependent FTIR, and X-Ray diffraction technique. The results show that the multilayer films are formed by stacking of HAB monolayers via π-π interactions and the adjacent two monolayers in the film are arranged in an asymmetric way in the multilayer films.