1 research outputs found
Induced Surface Enhancement in Coral Pt Island Films Attached to Nanostructured Ag Electrodes
Coral Pt islands films are deposited via electrochemical
reduction
on silica-coated nanostructured Ag electrodes. From these devices
surface-enhanced (resonance) Raman [SEÂ(R)ÂR] signals of molecules exclusively
attached to Pt are obtained with intensity up to 50% of the value
determined for Ag. SEÂ(R)ÂR spectroscopic investigations are carried
out with different probe molecules, silica-coating thicknesses, and
excitation lines. Additionally, field enhancement calculations on
Ag–SiO<sub>2</sub>–Pt support geometries are performed
to elucidate the influence of the Pt island film nanostructure on
the observed Raman intensities. It is concluded that the nonperfect
coating of the Pt island film promotes the efficiency of the induced
Pt SER activity. Comparison with similar measurements on Ag–SiO<sub>2</sub>–Au electrodes further suggests that the chemical nature
of the deposited metal island film plays a minor role for the SEÂ(R)ÂR
intensity