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Dynamic Monitoring of Molecular Structure at Solid/Liquid Interfaces

固/液界面分子结构的动态监测

基本信息

批准号：
13304047
负责人：
UOSAKI Kohei
金额：
$ 32.36万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13304047/
关键词：
Self-assembled monolayer Solid liquid interface Sun frequency generation Visible pump IR probe technique Scanning probe microscopy Surface x-ray scattering Quartz crystal microbalanc Semiconductor nanocluster 溶液界面 SFG 可視光ポンプ-SFGプローブ法

项目摘要

・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.

·构建用于结构动态变化的太阳频率生成（SFG）系统。(a)在基于ps的SFG系统中增加了355nm激发光束的泵浦线，从而可以以~ 2Ops的时间分辨率跟踪随时间变化的结构。(b)基于可见泵浦红外探测系统，利用100 fs激光构建了宽带SFG系统。·SFG系统在固/液界面中的应用。(a) TiO_2表面转化为亲水表面和醇吸附的监测。二氧化钛是研究最多的光催化剂，在紫外光照射下将疏水表面转化为亲水表面是一个有趣的过程。在这里，SFG被用来监测从疏水表面到亲水表面的转化过程和对醇的吸附。半导体纳米团簇中的载流子动力学半导体纳米团簇由于其独特的光学性质而备受关注。利用可见泵浦-红外吸收探针技术研究了分散在玻璃中的CdSSe纳米团簇和光激发载流子（电子和空穴）动力学。(c)电极/电解质界面水结构测定。尽管从基础和应用的角度来看，电极表面水的结构都引起了人们的关注，但由于技术的限制，人们对电极表面水的结构还没有很好的了解。在这里，我们成功地用SFG测量了金膜电极上的水结构作为电极电位的函数。