Abstract
A novel coating or imaging method to deposit organic pigment particles on a glass plate is proposed. The method is based on the photocatalytic reactions, and utilizes an aqueous dispersion consisting of pigments (phthalocyanines), surfactants to disperse the pigments, photocatalyst (Ru(bpy)3Cl3, bpy=bipyridine) and sacrificial agent([Co(NH3)5Cl]Cl2). Photoirradiation (λ=450 nm) of the dispersion through a photomask and a glass plate induced the co-deposition of pigment particles and Co(OH)2to give pigment-Co(OH)2 hybrid films on the glass plate depending on the pattern of the photomask employed. The effect of irradiation time, light intensity, and surfactant type on the film formation was investigated,and a model for the photodeposition mechanism was proposed. The electric conductivity measurements in the dark and under illumination using a surface-type cell revealed that the hybrid film is photoconductive.
