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Nature and Properties of Ultrathin Nanocrystalline Gold Films Formed at the Organic−Aqueous Interface

Agrawal, Ved Varun and Kulkarni, G. U. and Rao, C. N. R. (2005) Nature and Properties of Ultrathin Nanocrystalline Gold Films Formed at the Organic−Aqueous Interface. THE JOURNAL OF PHYSICAL CHEMISTRY B, 109 (15). pp. 7300-7305.

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Abstract

Ultrathin nanocrystalline films of gold formed at different temperatures at the organic−aqueous interface have been investigated by X-ray diffraction, electron microscopy, atomic force microscopy, and electronic spectroscopy. The films are smooth and continuous over relatively large length scales and are generally 100 nm thick. The size of the nanocrystals is sensitive to the reaction temperature, which also determines whether the film is metallic or an activated conductor. The surface plasmon band of gold is highly red-shifted in the films. Alkanethiols perturb the structure of the films, with the magnitude of the effect depending on the chain length. Accordingly, the position of the plasmon band and the electrical resistance of the films are affected by interaction with alkanethiols; the plasmon band approaches that of isolated nanocrystals in the presence of long-chain thiols.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3615
Deposited By:JNCASR
Deposited On:19 Jan 2009 09:56
Last Modified:19 Jan 2009 09:56

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