Probing photoelectrochemical processes in Au-CdS nanoparticle arrays by surface plasmon resonance: application for the detection of acetylcholine esterase inhibitors.
The photoelectrochemical charging of Au-nanoparticles (NP) in a Au-nanoparticle/CdS-nanoparticle array assembled on a Au-coated glass surface is followed by means of surface plasmon resonance (SPR) spectroscopy upon continuous irradiation of the sample. The charging of the Au-NPs results in the enhanced coupling between the localized surface plasmon of the Au-NP and the surface plasmon of the bulk surface, leading to a shift in the plasmon angle. The charging effect of the Au-NPs is supported by concomitant electrochemical experiments in the dark. Analysis of the results indicates that ca. 4.2 electrons are associated with each Au-nanoparticle under steady-state irradiation. The photoelectrochemical charging effect of the Au-NPs in the Au-CdS NP array is employed to develop a SPR sensor for acetylcholine esterase inhibitors.
Zayats
Maya
M
Institute of Chemistry and The Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Kharitonov
Andrei B
AB
Pogorelova
Svetlana P
SP
Lioubashevski
Oleg
O
Katz
Eugenii
E
Willner
Itamar
I
D000818:Animals; D019187:Cadmium Compounds / Q000737:chemistry*; D002800:Cholinesterase Inhibitors / Q000032:analysis*; D004563:Electrochemistry / Q000379:methods*; D004593:Electrophorus; D006046:Gold / Q000737:chemistry*; D036103:Nanotechnology; D010316:Particle Size; D010777:Photochemistry / Q000379:methods; D013440:Sulfides / Q000737:chemistry*; D020349:Surface Plasmon Resonance
D019187:Cadmium Compounds; D002800:Cholinesterase Inhibitors; D013440:Sulfides; C034939:cadmium sulfide; D006046:Gold