Photoelectrochemical Sensor Based on CdSe/ZnS Quantum Dots and Sarcosine Oxidase

M. Riedel, G. Goebel, F. Lisdat
Technical University of Applied Sciences Wildau, DE

Keywords: ligtht-triggered sensor, semiconductor nanoparticle, photocurrent, enzyme, parallel analysis

Summary:

The presentation shows how quantum dots (QD) can be coupled with electrodes in such a way that analyte detection becomes feasible. The current under illumination and a defined potential appears as the sensor output. Here the oxygen sensitivity of CdSe/ZnS nanoparticles is used to combine it with an enzymatic reaction. Sarcosine oxidase, but also other oxidases, can be used resulting in a signal chain sensitive for the respective substrate. The immobilisation has to ensure a high density of the biocatalyst in front of the QD electrode. The light directed sensor read out also allows for a parallel analysis of several substances.