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Fabrication and surface-enhanced Raman scattering (SERS) of Ag/Au bimetallic films on Si substrates

Fabrication and surface-enhanced Raman scattering (SERS) of Ag/Au bimetallic films on Si substrates,10.1016/j.apsusc.2011.09.052,Applied Surface Scien

Fabrication and surface-enhanced Raman scattering (SERS) of Ag/Au bimetallic films on Si substrates  
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Ag films on Si substrates were fabricated by immersion plating and served as sacrificial materials for preparation of Ag/Au bimetallic films by galvanic replacement reaction. The formation procedure of films on the surface of Si was studied by scanning electron microscopy (SEM), which revealed Ag films with island and dendritic morphologies experienced novel structural evolution process during galvanic replacement reaction, and nanostructures with holes were produced within the resultant Ag/Au bimetallic films. SERS activity both of sacrificial Ag films and resultant Ag/Au bimetallic films was investigated by using crystal violet as an analyte. It has been shown that SERS signals increased with the process of galvanic substitution and reached intensity significantly stronger than that obtained from pure Ag films.
Journal: Applied Surface Science - APPL SURF SCI , vol. 258, no. 3, pp. 1144-1148, 2011
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