ZB 10 - Soft Condensed Matter (R. Holyst)

GaN-based platforms with Au-Ag alloyed metal layer for surface enhanced Raman scattering

Author(s): Weyher, J. L. and Dziecielewski, I. and Kaminska, A. and Rolinski, T. and Nowak, G. and Holyst, R.
Title: GaN-based platforms with Au-Ag alloyed metal layer for surface enhanced Raman scattering
Abstract: The fabrication procedure of efficient surface enhanced Raman scattering platforms is demonstrated based on reproducibly photo-etched GaN layers covered by a thin Au-Ag layer and subjected to partial Using a gold-rich Au57Ag43 alloy (70/30 wt. \%), it is to preserve about 19 at. \% of silver in the layer, even after in nitric acid for up to 24 h. A large enhancement of the Raman from the test 4-mercaptobenzoic acid molecules attached to such Au-Ag metal layer is obtained due to the presence of a high of Ag. For the optimal etching time, in the range of 6-24 h, enhancement factor (EF) greater than 10(7) was obtained. The of different features of our SERS platforms such as the of pores, nano-roughness, and the chemical composition of the metal for the EF parameter are critically discussed. (C) 2012 American Institute of Physics. [}http://dx.doi.org/10.1063/1.4769106]
Journal: JOURNAL OF APPLIED PHYSICS
Volume: 112
ID: ISI:000312490700132
Year: 2012
DOI: 10.1063/1.4769106