NDLI: Self-assembly of semiconductor quantum-dots on electrodes for photoelectrochemical biosensing

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Self-assembly of semiconductor quantum-dots on electrodes for photoelectrochemical biosensing

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Back cover

Photochemical & Photobiological Sciences Vol - 6 Issue - 3

Photochemical & Photobiological Sciences Vol - 6 Issue - 2

Photochemical & Photobiological Sciences Vol -5

Photochemical & Photobiological Sciences Vol -4

Photochemical & Photobiological Sciences Vol -3

Photochemical & Photobiological Sciences Vol -2

Self-assembly of semiconductor quantum-dots on electrodes for photoelectrochemical biosensing

Content Provider	Royal Society of Chemistry (RSC)
Author	Freeman, Ronit Willner, Itamar Beissenhirtz, Moritz Gill, Ron
Copyright Year	2007
Abstract	CdS nanoparticles linked through a duplex DNA to a Au electrode do not lead to a noticeable photocurrent upon their illumination in the presence of triethanolamine, TEOA, 20 mM, pH = 7.2. The intercalation of doxorubicin into the duplex DNA stimulates, however, the generation of a photocurrent. This is attributed to the trapping of photoexcited conduction-band electrons by the intercalator units that facilitates, by a hopping mechanism, the electron transport to the electrode. The oxidation of TEOA by valence band holes allows the formation of a steady state photocurrent. This basic phenomenon is used to probe the operation of a DNA-based machine through the assembly of CdS nanoparticles on a Au electrode. The machine includes a nucleic acid “track”, (1), that binds a primer, (2), through hybridization to a predefined domain. In the presence of polymerase, the nucleotide mixture, dNTPs, and the nicking enzyme, the autonomous replication, nicking and displacement of the “waste product”, (3), are activated. The “waste product” bridges the (4)-functionalized CdS nanoparticles and the nucleic acid (5)-functionalized Au electrode, resulting in the assembly of the nanoparticles on the electrode. The intercalation of doxorubicin into the DNA–CdS nanostructures results in the generation of photocurrents upon illumination in the presence of TEOA, pH = 7.2. The photocurrents are controlled by the time intervals used to operate the DNA machine.
Starting Page	416
Ending Page	422
Page Count	7
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	6
Issue Number	4
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b612435f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Electrode Photocurrent TEOA DNA polymerase Enzyme DNA Valence and conduction bands Triethanolamine DNA machine Doxorubicin
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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