Fabrication of composite film comprising TiO2/CdS and polyelectrolytes based on ionic attraction

Composite film comprising TiO2/CdS nanoparticles and polyelectrolytes was fabricated based on electrostatic interaction. By utilizing cationic TiO2 and anionic CdS colloids, we realized the assembly of dissimilar nanoparticles. The alternating assembly film of TiO2/CdS and polyelectrolytes was further characterized by several methods including UV–Vis spectroscopy and transmission electron microscopy (TEM). Most importantly, surface photovoltage (SPV) measurements showed that interesting photoelectron energy conversion occurred in the TiO2/CdS composite film.