Controlled fabrication of CdS/TiO2 nanorod heterojunction on Ti foils and its photoelectrochemical activity

Large-scale TiO2 nanorod arrays were synthesized on anodization-treated Ti substrates by a facile hydrothermal method, and followed by depositing CdS nanoparticles on TiO2 nanorods using successive ion layer adsorption and reaction (SILAR) method. The morphology and composition of the CdS/TiO2 nanorod heterojunction were characterized systematically by SEM, TEM and UV-vis spectra. A formation mechanism was proposed based on the formation CdS/TiO2 nanorod heterojunction by hydrothermal and SILAR progress. The CdS/TiO2 nanorod heterojunction exhibited enhanced visible light absorption and photocurrent density.