Laser-driven growth of silver nanoplates on p-type GaAs substrates and their surface-enhanced Raman scattering activity

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https://pubs.acs.org/doi/10.1021/jp900638m

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https://doi.org/10.1021/jp900638m
 http://hdl.handle.net/11603/29203

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UMBC Physics Department

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https://orcid.org/0000-0002-6370-8765

Date

2009-03-20

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journal articles
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Citation of Original Publication

Sun, Yugang, and Matthew Pelton. “Laser-Driven Growth of Silver Nanoplates on p-Type GaAs Substrates and Their Surface-Enhanced Raman Scattering Activity.” The Journal of Physical Chemistry C 113, no. 15 (April 16, 2009): 6061–67. https://doi.org/10.1021/jp900638m.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

Contact between aqueous solutions of silver nitrate (AgNO₃) and pristine surfaces of p-type gallium arsenide (GaAs) wafers results in essentially no reaction at room temperature and in the dark. The galvanic reactions between the GaAs wafers and AgNO₃ can be triggered under illumination of laser beams with power densities higher than a critical value (∼15 mW/cm² for a 630 nm laser), resulting in the growth of silver (Ag) nanoplates on the GaAs surface. The density and dimensions (including both thickness and edge length) of the resulting nanoplates can be readily tuned by controlling the growth time and laser power density. The as-grown Ag nanoplates on the substrates significantly enhance Raman signals of interesting molecules and serve as a new class of promising surface-enhanced Raman scattering substrates for sensitive chemical detection.