Surface enhanced infrared absorption (SEIRA) spectroscopy using gold nanoparticles on As2S3 glass

摘要

Surface enhanced infrared absorption (SEIRA) spectroscopy was investigated using sputtered gold nanoparticles on the As2S3 chalcogenide glass. Islands films were sputtered on the substrate with various thicknesses from 11.1±0.9 nm to 31.4±3.6 nm. Infrared transmission spectra of 4-nitrothiophenol adsorbed on gold nanoparticles show that SEIRA effect was dependent of the thickness of discontinuous gold films. Only symmetric NO2 stretch (1336 cm~(-1)) was observed and enhanced due to surface selection rules. The best enhancement is one order of magnitude stronger than for a continuous gold film. The corresponding thickness measured by Atomic Force Microscopy is 16.3±0.5 nm.