Preparation and photoconductivity of PVP-CoPc self-assembled film

Through the complexation of cobalt phthalocyanine (CoPc) and a film of poly [4-vinyl-pyridine] (PVP) polarized by an electric field, a new type of pref erentially oriented self-assembled film (PVP-CoPc) was obtained. The charac terization of the film by differential scanning calorimetry (DSC), angle-de pendent x-ray photoelectron spectroscopy (XPS), and Fourier transform infra red reflection absorption spectroscopy (FTIR-RAS) revealed that the planes of pyridine rings oriented perpendicular to the film surface, while the pla nes of phthalocyanine rings were oriented parallel with, and coordinated on , the film surface. Photoconductivity study showed that the photoconductivi ties of the photoreceptors (PR's) made from the PVP-CoPc self-assembled fil m were much better than those from CoPc alone. These changes were ascribed to the charge transfer and the unique and ordered structure of PVP-CoPc sel f-assembled film.