3.1.1. Photoreduction

Since some chemical compounds containing metal element can be reduced to metal under irradiation, photoreduction is regarded as a facile approach to decorate semiconductor nanostructures with noble metal. Typically, in the work of Yu et al., hydrothermally-synthesized TiO2 nanosheets were added to an aqueous solution of H2PtCl6. Under stirring and the irradiation of ultraviolet (UV) light, H2PtCl6 was reduced to Pt and deposited on TiO2 nanosheets, leading to the formation of Pt-decorated TiO2 nanosheets [48].
