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Comparative Study on the Growth of Silver Nanoplates on GaAs Substrates by Electron Microscopy, Synchrotron X-ray Diffraction, and Optical Spectroscopy

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Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, and National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York, 11973
* To whom correspondence should be addressed. E-mail: [email protected]. Fax: 630-252-4646.
†Argonne National Laboratory.
‡Brookhaven National Laboratory.
Cite this: J. Phys. Chem. C 2008, 112, 24, 8928–8938
Publication Date (Web):May 27, 2008
https://doi.org/10.1021/jp801647k
Copyright © 2008 American Chemical Society

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    Abstract

    We have recently developed a simple and efficient approach involving the galvanic reaction between a pure aqueous solution of AgNO3 and GaAs wafers to directly grow high-quality Ag nanoplates with chemical clean surfaces on the GaAs wafers [ Chem. Mater.2007, 19, 5845; Small2007, 3, 1964]. The capability to finely control the dimensions (i.e., size and thickness) of the Ag nanoplates and the time-dependent characterizations have not been explored yet. In this article, time-dependent evolutions of the Ag nanostructures grown on highly doped n-type GaAs wafers through the reactions with AgNO3 solutions, which have concentrations varying in the range of 1−10 M, for different times have been systematically investigated by employing various powerful techniques including electron microscopy, synchrotron X-ray diffraction, and optical microscopy. The results indicate that the sizes of Ag nanoplates can be tuned in the range from tens of nanometers to half a micrometer and their thicknesses can be varied from ∼20 to ∼160 nm by simultaneously controlling the concentration of AgNO3 solution and the growth time. The as-grown Ag nanoplates exhibit tunable strong extinction peaks in the ultraviolet−visible−near-infrared spectral regimes, where the GaAs substrates intensively interact with the light.

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    X-ray diffraction pattern captured by CCD camera of the as-grown Ag nanoplates, and optical scattering spectra of single nanoplates. This material is available free of charge via the Internet at http://pubs.acs.org.

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