TITLE

Evaluation of quantum dots applied as switchable layer in a light-controlled electrochemical sensor

AUTHOR(S)
Zhao Yue; Khalid, Waqas; Zanella, Marco; Abbasi, Azhar Zahoor; Pfreundt, Andrea; Gil, Pilar Rivera; Schubert, Kirsten; Lisdat, Fred; Parak, Wolfgang J.
PUB. DATE
February 2010
SOURCE
Analytical & Bioanalytical Chemistry;Feb2010, Vol. 396 Issue 3, p1095
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Gold electrodes with switchable conductance are created by coating the gold surface with different colloidal quantum dots. For the quantum dot immobilization, a dithiol compound was used. By polarizing the electrode and applying a light pointer, local photocurrents were generated. The performance of this setup was characterized for a variety of different nanoparticle materials regarding drift and signal-to-noise ratio. We varied the following parameters: quantum dot materials and immobilization protocol. The results indicate that the performance of the sensor strongly depends on how the quantum dots are bound to the gold electrode. The best results were obtained by inclusion of an additional polyelectrolyte film, which had been fabricated using layer-by-layer assembly. [Figure not available: see fulltext.]
ACCESSION #
47656734

 

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