Irreversible Adsorption and Reduction of p-Nitrothio-Phenol Monolayers on Gold: Electrochemical in Situ Surface enhanced Raman Spectroscopy

摘要

The redox behavior of p-nitrothiophenol (p-NTP)monolayers on gold was studied by electrochemical in situsurface enhanced Raman spectroscopy (SERS). The chemicaladsorption of p-NTP on gold through Au-S bonding wasconfirmed by the comparison between the Raman spectra ofparent molecules and that of the monolayer. The irreversiblereduction of p-NTP monolayers to p-aminothiolphenol (p-ATP)monolayers was evidenced by the observed potential dependentspectral changes. The present results demonstrated the potentialof SERS in investigating the adsorbate-substrate interaction andin monitoring surface reactions at a monolayer scale.