Aqueous Phase Preparation of CdTe Nanorods and its Application in Recognition of Cu2+ Ions

Opticala2tunable CdTe nanorods were synthesized in aqueous solution using thioglycoclic acid and L-cysteine as co-stabilizing reagents. CdTe nanorods with duala2wavelength emission was appreciated as a novel fluorescent probe for copper ions. Copper ions display a significant quenching effect on the nanorods trap emission at 645nm and no effect on band-edge emission at 535nm. In a slight basic medium, the surface trap emission intensity of nanorods is proportional to the concentration of Cu2+ ion in the range from 0 to 2.8 0-6mol/L, and the corresponding limit of detection is 4.0 0-9mol/L. The mechanism of reaction between CdTe nanorods and Cu2+ ions are discussed in further.