Abstract
Plasmon coupling interactions between adjacent noble metal nanoparticles (NPs) can cause significantly enhanced local electric field in the gap region, which could be utilized to dramatically enhance the fluorescence intensity of chromophores. Here we performed a systematic study on the influence of different factors on plasmon coupling-enhanced fluorescence, including shape and size of metal NPs, dye distribution, and separation distance. Cyanine 5 (Cy5) acted as the fluorescence probe and DNA was employed to assemble nanostructures to immobilize Cy5 into the gap region of the coupled metal NPs. Fluorescence of Cy5 was prequenched by attaching DNA linked Cy5 to the surface of Au nanospheres (NSs). The quenched fluorescence of Cy5 was turned-on by forming nanoassembly through DNA hybridization with different enhancing substrates: Au NSs, Au nanorods (NRs) and Au@Ag NSs. Au@Ag NSs were found to give the largest fluorescence enhancement effect. Larger-sized Au@Ag NPs were found to display larger fluorescenc...
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
