Photocatalytic Activity of Gold Nanocrystals and Its Role in Determining the Stability of Surface Thiol Monolayers

Authors: J. Jack Li; Xiaogang Peng

Source: Journal of Nanoscience and Nanotechnology, Volume 4, Number 6, July 2004 , pp. 565-568(4)

Publisher: American Scientific Publishers

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Abstract:

Colloidal gold nanocrystals were found to be efficient photocatalysts for the oxidation of thiols to the corresponding disulfide in aqueous solution under UV radiation, although no noticeable catalytic effect of gold nanocrystals was observed under dark conditions for the same process. The turnover number per particle increased with the size of the nanocrystals and reached 1200 molecules/s for 45-nm gold nanocrystals. The photochemical instability of colloidal gold nanocrystals coated by thiol ligands was found to be determined by the photocatalytic oxidation of the thiol ligands.

Keywords: GOLD NANOCRYSTALS; PHOTOCATALYST; THIOLS; DISULFIDES

Document Type: Short communication

DOI: http://dx.doi.org/10.1166/jnn.2004.003

Publication date: 2004-07-01

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Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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