Abstract
In this paper, we have synthesized ZnCdSeS quantum dots (QDs)-gold nanoparticle (Au NPs) hybrids in aqueous solution via bi-functional linker mercaptoacetic acid (MPA). The absorption peaks of ZnCdSeS QDs and Au are both located at 520 nm. It is investigated that PL intensity of QD-Au hybrid can be affected by the amounts of Au and pH value of hybrid solution. The located surface plasmon resonance (LSPR) effect of QD-Au NPs has been demonstrated by increased fluorescence intensity. The phenomenon of fluorescence enhancement can be maximized under the optimized pH value of 8.5. LSPR-enhanced photoluminescence property of QD-Au hybrid will be beneficial for the potential applications in the area of biological imaging and detection.
Highlights
Photoluminescence (PL) properties of CdSe quantum dots (QDs) have been extensively investigated due to its potential application such as solar cell [1, 2], light emitting devices [3], biological imaging [4] and so on
The water soluble Au NPs were synthesized through the reduction of gold chloride with sodium citrate in aqueous solution
Highly efficient ZnCdSeS QDs-Au hybrids have been synthesized via connecting with bi-functional linker
Summary
Photoluminescence (PL) properties of CdSe quantum dots (QDs) have been extensively investigated due to its potential application such as solar cell [1, 2], light emitting devices [3], biological imaging [4] and so on. Metal–semiconductor system has become research focus because of the complex interplay of enhancing and quenching physicochemical processes due to the metal surface plasmons (SPs). Both the theoretical and experimental study have been done for the promising applications in nanotechnology and biotechnology [5,6,7,8,9,10,11]. In the isolated metallic nanostructures, due to the collective oscillations of free electrons, the localized surface plasmon resonance (LSPR) is excited accompanied with the enhancement of optical near field [6]. Due to the existence of local electromagnetic field, the distance between the metal and QDs is demonstrated to be an influential factor to the fluorescence enhancement.
Sign-in/Register to view highlights & summary 
Published Version (
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