Dynamic Monitoring of Molecular Structure at Solid/Liquid Interfaces

点击翻译按钮获取中文摘要

・Construction of Sun frequency generation (SFG) system for dynamic structure change.(a)A pump line using 355nm excitation beam was added to a ps-based SFG system so that time dependent structure change can be followed with 〜2Ops time resolution.(b)A broad band SFG system was constructed based on a visible pump IR probe system using 100 fs laser.・Applications of the SFG systems to solid/liquid interface.(a)Monitoring of TiO_2 surface for the conversion to hydrophilic surface and adsorption of alcohol.TiO_2 is the most studied photocatalyst and conversion of hydrophobic surface to hydrophilic surface by UV illumination is an interesting process. Here, SFG was used to monitor the conversion process from hydrophobic to hydrophilic surface and the adsorption of alcohol.(b)Carrier dynamics in semiconductor nanoclustersSemiconductor nanoclusters attract much attention due to their unique optical properties. Photoexcited carrier (electron and holes) dynamics in CdSSe nanoclusters dispersed in glass and CdS nanoclusters in reversed micelles were followed by visible pump-IR absorption probe technique.(c)Determination of water structure at electrode/electrolyte interface.Although structure of water at electrode surface attracts much interests from both fundamental and application view points, it is not well understood due to the limitation of techniques. Here, we were successful to measure the water structure at gold film electrode as a function of electrode potential using SFG.