Effect of the residual template on surface photoelectric characteristics of structurally-ordered macroporous nanocrystalline TiO_2

摘要

The macroporous nanocrystalline TiOi thin film was prepared by dipping-coating method. Polystyrene (PS) microspheres template was used as pore-forming assistant and TiO; sol was used as precursor. The photoelectric characteristics of the samples were studied using surface photovoltage (SPV) and photoacoustic (PA) techniques. The presence of a small amount of residual template damages the integrity of the porous TiC>2 film with inverse opal structure, and TiO: may be restricted in certain application fields as photonic crystals. A small amount of residual template changes the surface photovoltaic properties of the porous TiO_2 film, resulting mainly in the broadened scope and the increased intensity of SPV response.