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Assembly of L-cys coated Quantum Dots-Au@Ag nanorods structure with fluorescence enhancement

In this paper, Au nanorods and Au@Ag nanorods were synthesized by seed –mediated growth process, and the Colloidal quantum dots CdSe/CdS/ZnS were produced by successive ionlayer absorption and reaction methods. A low-cost and practical ligand exchange of oil phase quantum dots and amino-functionalized Au@Ag nanorods was employed for the coupling process. The surface plasmonic peak is tunable by controllable operation and the photoluminescence peak of quantum dots can be adjusted to corresponding site by successive ion-layer absorption and reaction methods. This operation creates a good condition for plasmonic enhancement. By analysis of the time-resolved fluorescence intensity and the photoluminescence lifetime, we found the energy transfer of this structure. It’s a feasible method for coupling the metal nanorods with QDs.