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TiO2 NWs/CdS hierarchical nanocomposites were prepared for selective photoelectrochemical (PEC) detection of Cu 2+ . TiO2 nanowires were first prepared by a simple hydrothermal method. Then, CdS nanocrystals were successfully grown on TIO2 NWs through the chemical bath deposition method. The prepared TiO2 NWs/CdS nanocomposites were used as the photoanode for PEC sensing of Cu 2+ . The introducing of CdS QDs significantly improved the visible light harvesting efficiency of the potoanode. Moreover, ascorbic acid was used as reducing agent for the rapid conversion of Cu 2+ to Cu + , resulting in the formation of Cu2S coated on CdS. The formed Cu2S can act a recombination center which suppresses the charge transfer from the conduction band of CdS to TiO2 and results in an attenuated photocurrent. Thus, a PEC sensor could be used for Cu 2+ detection based on the targetinduced formation of exciton trapping with the aid of a effective reducing agent. The results showed that the proposed sensor possesses a good selectivity and sensitivity for Cu 2+ detection.

Sensitive Photoelectrochemical Detection of Cu2+ Using CdS Quantum Dots Decorated TiO2 Nanowires in Combination with a Chemical Reducing Reaction