A novel photoelectrochemical sensor based on photocathode of PbS quantum dots utilizing catalase mimetics of bio-bar-coded platinum nanoparticles/G-quadruplex/hemin for signal amplification

In Situ Enzymatically Generated Photoswitchable Oxidase Mimetics and Their Application for Colorimetric Detection of Glucose Oxidase

“…This protective layer with electrostatic repulsion prevents direct contact between the quantum dots, leading to the formation of stable water-soluble nanoparticles. Similarly, Na 3 PO 4 , poly dimethyl diallyl ammonium chloride (PDDA) and chitosan (CS) could also stabilize QDs [16,20,21]. However, TGA may inhibit the catalytic effect in our system because of its reducibility.…”

“…CdS is a favorable semiconductor material; under visible-light illumination, the electron of VB was excited into the CB and led to the VB producing h + . Because of the potential gradient between the CB (−0.57 V vs. NHE) of CdS QDs and the reduction potential of oxygen (0.815 V vs. NHE) [20], the oxygen in aqueous solution could accept the excited electrons and formed O 2 •− or • OH. The h + were able to oxidize TMB directly because the VB potential of CdS QDs was above that of TMB with an oxidation potential in the range of 0.22–0.7 V [26].…”

Novel photoelectrochemical hydrogen peroxide sensor based on hemin sensitized nanoporous NiO based photocathode

“…Different from the extensively researched photoanode based on the n-type semiconductors, photocathodes are made up of p-type semiconductors which prefer to interact with electron acceptors rather than the electron donors in the electrolyte solution [23,24] All solutions were prepared with ultrapure water (18.2 MΩ·cm -1 ) obtained from a Healforce water purification system.…”

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.…”