title: Induced surface enhancement in coral Pt island films attached to nanostructured Ag electrodes.
abstract: Coral Pt islands films are deposited via electrochemical reduction on silica-coated nanostructured Ag electrodes. From these devices surface-enhanced (resonance) Raman [SE(R)R] signals of molecules exclusively attached to Pt are obtained with intensity up to 50% of the value determined for Ag. SE(R)R spectroscopic investigations are carried out with different probe molecules, silica-coating thicknesses, and excitation lines. Additionally, field enhancement calculations on Ag-SiO(2)-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(2)-Au electrodes further suggests that the chemical nature of the deposited metal island film plays a minor role for the SE(R)R intensity.
authors.affiliation: Institut für Chemie, Technische Universität Berlin, Berlin, Germany.
authors.forename: H Khoa
authors.initials: HK
authors.lastname: Ly
authors.forename: Christopher
authors.initials: C
authors.lastname: Köhler
authors.forename: Anna
authors.initials: A
authors.lastname: Fischer
authors.forename: Julia
authors.initials: J
authors.lastname: Kabuss
authors.forename: Felix
authors.initials: F
authors.lastname: Schlosser
authors.forename: Mario
authors.initials: M
authors.lastname: Schoth
authors.forename: Andreas
authors.initials: A
authors.lastname: Knorr
authors.forename: Inez M
authors.initials: IM
authors.lastname: Weidinger
mesh_terms: D045304:Cytochromes c / Q000737:chemistry; D004566:Electrodes; D053768:Metal Nanoparticles / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D013499:Surface Properties
chemical_list: D012834:Silver; D010984:Platinum; D045304:Cytochromes c