Exciton-Plasmon Interactions between CdS Quantum Dots and Ag Nanoparticles in Photoelectrochemical System and Its Biosensing Application

Abstract

With DNA as a rigid spacer, Ag nanoparticles (NPs) were bridged to CdS quantum dots (QDs) for the stimulation of exciton-plasmon interactions (EPI) in a photoelectrochemical (PEC) system. Due to their natural absorption overlap, the exciton of the QDs and the plasmon of Ag NPs could be induced simultaneously. The EPI resonant nature enabled manipulating photoresponse of the QDs via tuning interparticle distances. Specifically, the photocurrent of the QDs could be greatly attenuated and even be completely damped by the generated EPI. The work opens a different horizon for EPI investigation through an engineered PEC nanosystem, and provides a viable mechanism for new DNA sensing protocol.

Resonance energy transfer from CdTe quantum dots to gold nanorods using MWCNTs/rGO nanoribbons as efficient signal amplifier for fabricating visible-light-driven “on-off-on” photoelectrochemical acetamiprid aptasensor

“…1D) has a large spectral overlap with the fluorescence emission of CdTe-MWCNTs/rGONRs (Fig. 1B), which provided the possibility for the RET [13,28].…”

Target-triggered triple isothermal cascade amplification strategy for ultrasensitive microRNA-21 detection at sub-attomole level

“…3B showed a good linear correlation of the current response difference (ΔI¼I miR-21 -I blank ) to the logarithm of the miR-21concentrations (logC miR-21 ) ranged from 1 aM to 100 pM, with a regression equation of ΔI/μA¼0.6904þ0.0234 logC miR-21 /M (R 2 ¼0.997). This kind of logarithmic relationship between the response signals with the concentration of target biomolecules is widely used for various DNA/miR biosensors Liu et al, 2008;Zhao et al, 2012a;Fan et al, 2014;Shi et al, 2016;Li et al, 2016), immunosensors (Kang et al, 2010) and cytosensors (Zhao et al, 2012b). The main reason for this phenomenon might be due to the intrinsic property of ligandreceptor bio-recognition.…”

Ag nanoclusters could efficiently quench the photoresponse of CdS quantum dots for novel energy transfer-based photoelectrochemical bioanalysis

“…Analysts in this field are now infatuated with exploiting exquisite signaling mechanisms for innovative applications (Zhang et al, 2012b;Zhuang et al, 2015;Wang et al, 2015;Long et al, 2011;Wang et al, 2014a, Sun et al, 2015. Among various efforts, exciton-plasmon interactions (EPI) between the noble metal nanoparticles (NPs) and quantum dots (QDs) have been demonstrated as a unique route for ingenious PEC biosensing purposes , Zhao et al, 2012. Such interesting mechanism was then used for tentative bioanalysis with a simple DNA hybridization model, which provided a feasible basis for elegant PEC bioassays and many recent protocols were proposed for addressing different targets (Zeng et al, 2013;Ma et al, 2016).…”