The hybrid metal/quantum dots (QDs) structures were synthesized and characterized with different thicknesses of silica shells by uncomplicated and typical methods. By engineering the shell thickness and Au nanoparticles (Au NPs) core size with shapes, the interaction between Au NPs and QDs could be adjusted flexibly to witness the energy transfer process thoroughly. The improvement of the emission intensity and the reduction in the PL lifetime with the appropriate thickness of silica layer were obtained. Likewise, the energy transfer efficiency between QDs donor-acceptor pairs was inferred as the dominance of larger QDs with hybrid structures. The quenching of QDs donors and the enhancement of QDs acceptors in PL emission intensity were determined by the different core-shell structures. Finally, as-prepared metal/silica/QDs structures have been explored for bio-imaging applications, leading to enhanced light absorption and sensitivity.
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