Sum Frequency Generation (SFG) Studies on the Interfacial Structure of Organic Thin Films

摘要

A highly surface-sensitive vibrational spectroscopy, sum frequency generation (SFG), has been employed to investigate the interfacial structure of the Langmuir-Blodgett (LB) thin films on solid substrates. The SFG measurements demonstrate that the molecular structures at the surface layer of the even-numbered LB films of stearic acid considerably change both in air and in solution when Cd~(2+) cations are present A flip-over model is proposed to explain the Cd~(2+) - induced surface reorganization process.