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Light-addressable amperometric electrodes for enzyme sensors based on direct quantum dot-electrode contacts

  • Quantum dots allow the generation of charge carriers upon illumination. When these particles are attached to an electrode a photocurrent can be generated. This allows their use as a light-switchable layer on the surface. The QDs can not only exchange electronics with the electrode, but can also interact with donor or acceptor compounds in solution providing access to the construction of signal chains starting from an analytic molecule. The magnitude and the direction of the photocurrent depend on several factors such as electrode polarization, solution pH and composition. These defined dependencies have been evaluated with respect to the combination of QD-electrodes with enzyme reactions for sensorial purpose. CdSe/ZnS-QD-modified electrodes can be used to follow enzymatic reactions in solution based on the oxygen sensitivity. In order to develop a photoelectrochemical biosensor, e.g. glucose oxidase is immobilized on the CdSe/ZnS-electrode. One immobilization strategy applies the layer-by-layer-technique of GOD and a polyelectrolyte. Photocurrent measurements of such a sensor show a clear concentration dependent behavior. The principle of combing QD oxidase. The sensitivity of quantum dot electrodes can be influenced by additional nanoparticles, but also by multiple layers of the QDs. In another direction of research it can be influenced by additional nanoparticles, but also by multiple layers of the QDs. In another direction of research it can be demonstrated that direct electron transfer from excited quantum dots can be achieved with the redox protein cytochrome c. This allows the detection of the protein, but also interaction partners such as a enzymes or superoxide.

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Metadaten
Author:Marc Riedel, Gero GöbelORCiD, Wolfgang J. Parak, Fred LisdatORCiDGND
URN:urn:nbn:de:kobv:526-opus4-15266
DOI (Version of Record):https://doi.org/10.1117/12.2044601
Publisher:Society of Photo-Optical Instrumentation Engineers (SPIE)
Document Type:Conference Proceeding
Language:English
Year of Publication:2014
Publishing Institution:Technische Hochschule Wildau
Release Date:2021/09/17
Tag:enzyme sensor; light adressability; photobioelectrochemistry; quantum dot electrode; signal chain
First Page:195
Last Page:200
Source:M. Riedel, G. Göbel, W. J. Parak, and F. Lisdat "Light-addressable amperometric electrodes for enzyme sensors based on direct quantum dot-electrode contacts", Proc. SPIE 8955, Colloidal Nanoparticles for Biomedical Applications IX, 89551M (24 March 2014); https://doi.org/10.1117/12.2044601
Copyright:Copyright 2014 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Faculties an central facilities:Fachbereich Ingenieurwesen / Wirtschaftsingenieurwesen (bis 8/2014)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 572 Biochemie
Licence (German):Das Dokument ist urheberrechtlich geschützt
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