Muniz-Miranda, Maurizio and Gellini, Cristina and Salvi, Pier Remigio and Innocenti, Massimo and Pagliai, Marco and Schettino, Vincenzo (2011) Fabrication of nanostructured silver substrates for surface-enhanced Raman spectroscopy. Journal of Nanoparticle Research, 13 (11). pp. 5863-5871.
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Four nanostructured Ag substrates have been fabricated with different surface morphologies and tested with surface-enhanced Raman scattering (SERS) experiments by adsorption of adenine. Their SERS efficiency has been compared and related to the surface roughness resulting from atomic force microscopy measurements. Chemical etching of silver by thiourea/Fe(III)nitrate produces homogeneously roughened plates, exhibiting the largest three-dimensional surface and the best SERS enhancement. They mostly exhibit surface protrusions with sizes around 200Â nm, thus matching the best condition for obtaining SERS enhancement by laser excitation at 785Â nm. This is quite important in the case of biomolecules, whose samples often present strong fluorescence bands, which usually are not observed with red-shifted exciting lines. Moreover, these Ag platforms, owing to their uniform nanostructured surfaces, are suitable for obtaining reproducible results from microRaman investigation. In conclusion, the present nanofabrication of Ag surfaces allows obtaining SERS-active substrates, which combine high reproducibility and sensitivity and can be successfully employed in the molecular recognition of different organic ligands or biomolecules like nucleic acids and proteins.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||05 Jan 2012 09:30|
|Last Modified:||05 Jan 2012 09:42|
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