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Ultra-fine CdS quantum dots modified TiO2 nanotube arrays (TiO2-NTs) with enhanced visible-light activity were fabricated via cathodic electro-deposition combined with ion-exchange route.The as-formed CdS quantum dots were highly dispersed both outside and inside the TiO2-NTsas shown in Fig.1.The proposed strategy resulted in the strong combination and heterojunctions between CdS and TiO2 through Cd-O bonds.