Abstract
The influence of Au nanorods coated with a silica layer on the photoluminescence (PL) of CdTe quantum dots (QDs) was investigated. The Au nanorods were prepared using a seed-mediated method. They were coated with a silica layer on the surface and CdTe QDs were connected to the surface of the silica layers. The PL spectra suggested that the quenching effect of the Au nanorods was decreased by the isolation of the silica layer. Through the time-resolved PL measurement, it was found that the PL decay of QDs became faster. The [email protected]2-CdTe complex could potentially be used in biological sensing and thermal therapy.
Highlights
Luminescent semiconductor quantum dots (QDs), espe‐ cially those emitting near-infrared light, such as CdTe, PdS, are considered to be very interesting material for photo‐ voltaic [1], photodetection [2] and biological sensing [3, 4, 5]
We found that the quenching effect of the Au nano‐ rods was decreased by the isolation of the silica layer
The CdTe QDs are directly attached to the Au nanorods
Summary
Luminescent semiconductor quantum dots (QDs), espe‐ cially those emitting near-infrared light, such as CdTe, PdS, are considered to be very interesting material for photo‐ voltaic [1], photodetection [2] and biological sensing [3, 4, 5]. It is important to investigate increasing the PL intensity of QDs. Noble metal nanostructures that support the collective oscillations of conduction-band electrons, which are known as localized surface plasmon resonances (LSPR), can concentrate optical electromagnetic field into subwa‐ velength regions close to the surface of the nanostruc‐ tures. The processes of light emission in QDs can be significantly affected by proximal metal nanoparticles (NPs) through coupling between QD excitons and LSP of metal nano‐ structures This is due to the joint effect of the excitation enhancement and quantum yield modification. The plasmon wavelength of the longitudinal mode of Au nanorods can be synthetically tuned from visible to near-infrared regions by tailoring their aspect ratios, that is, the ratio between the length and diameter [11] It is achievable for Au nanorods/CdTe QDs hybrid nanostructures to realize exciton and LSP coupling, and further obtain PL efficiency enhancement. We found that the quenching effect of the Au nano‐ rods was decreased by the isolation of the silica layer
Sign-in/Register to view highlights & summary 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
