Potential modulated infrared reflectance spectroscopy of Pt-diisocyanide nanostructured electrodes

The properties of nanostructured electrodes prepared by the attachment of p latinum nanoparticles to a gold electrode surface functionalized with a sel f-assembled monolayer of 1,8-diisocyanooctane have been investigated by ref lectance infrared spectroscopy using the SNIFTIRS technique. The characteri stic vibrations of the NC group have been observed both in the absence and in the presence of an attached nanoparticle layer. The bipolar bands observ ed indicate a potential dependent vibration, and this has been discussed in terms of the Stark effect and of the coordination chemistry of the isocyan ide group attached to metal surfaces. The potential dependence of the NC vi bration is similar to that observed for adsorbed CO. Coadsorption experimen ts using CO confirm unequivocally the presence of Pt on the film. Similar r esults have been obtained with palladium nanoparticles.