Ultraviolet light-irradiation (excitaion wavelength > 300 nm) of a mixed ethanol solution of cadmium perchlorate and elemental sulfur (S₈) under deaerated conditions has led to deposition of CdS nanoparticles on the surface of TiO₂ (CdS/TiO₂). With increasing irradiation time, the number density of CdS particles increased, whereas their mean size hardly changed. Also, the deposition of which rate decreased with increasing irradiation time ceased on the whole coverage of the TiO₂ surface with CdS. The deposition of CdS was found to be caused by TiO₂ photocatalysis via the oxidation of ethanol to acetaldehyde and the reduction of S₈ to S^2- ions. Electron energy loss spectra and high-resolution transmission electron micrograph images of CdS/TiO₂ confirmed the deposits to be hexagonal CdS crystals in a good contact with TiO₂. The electronic absorption spectra of CdS/TiO_{2 had absorption below ca. 550 nm due to the interband transition of CdS in addition to the absorption of TiO2 below 390 nm. As a result of further photodeposition of Pt on CdS/TiO2, Pt particles were deposited almost selectively on the TiO2 surface (Pt/CdS/TiO2). The time evolution for the CdS photodeposition was well-fitted by a rate equation drawn by assuming efficient photoinduced electron transfer from CdS to TiO2 (Fig. 1): CdS(t) = CdSsat[1 – exp(-kt)], where CdSsat and k are the saturated deposition amount of CdS and the apparent rate constant, respectively. Visible light-irradiation (excitation wavelength > 440 nm) of an ethanol suspension containing Pt/CdS/TiO2 gave rise to H2.}