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Reaction control with surface nano-structured materials

表面纳米结构材料的反应控制

基本信息

批准号：
11304041
负责人：
MATSUMOTO Yoshiyasu
金额：
$ 7.97万
依托单位：
The Graduate University for Advanced Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

We have investigated mainly the following subjects using nano-structured materials, including pseudo-one dimensional surface compound of AgO, nanographene, and ultrathin layers of copper :1. Surface reactions on clean and oxygen-covered Ag(110) surfaces.We clarified the mechanism of uv-light induced-phbtoelimination reaction of oxygen as follows. The reaction is initiated with electronic excitation of AgO chains, the reaction of excited AgO with carbidic carbon to form CO, and the rapid oxidation of CO to produce CO2.2. Electronic structure of nanographene on Pt(111):This was investigated by multiphoton photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. We identified an unoccupied σ* state located at 4 eV above the Fermi level, which is very sensitive to modification by deuterium.3. Photochemistry of methane on ultrathin copper layers and oxygen modified Pt(111)We prepared ultrathin copper films on Pt(111) and investigated the photochemistry of methane. The reaction cross sections depend on the number of copper layers. On the monolayer copper, the photochemistry resembles to that on Pt(111) and gradually changes to that on bulk copper surfaces as the number of layers increases. In addition, we compared the photochemistry on the oxygen-covered Pt(111) with that on the clean Pt(111) and found that methoxy group is produced and the reaction proceeds without poisoning by methyl product.

我们使用纳米结构材料主要研究了以下主题，包括AgO的伪一维表面化合物、纳米石墨烯和超薄铜层：1。清洁且覆盖氧的Ag(110)表面上的表面反应。我们阐明了氧的紫外光诱导-phbto消除反应的机理如下。该反应是通过AgO链的电子激发、激发的AgO与碳化物碳反应形成CO以及CO快速氧化产生CO2.2来引发的。 Pt(111)上纳米石墨烯的电子结构：通过多光子光电子能谱和紫外光电子能谱研究。我们在费米能级以上 4 eV 处发现了一个未占据的 σ* 态，该态对氘的修饰非常敏感。3。超薄铜层和氧改性Pt(111)上的甲烷光化学我们在Pt(111)上制备了超薄铜膜并研究了甲烷的光化学。反应截面取决于铜层的数量。在单层铜上，光化学类似于 Pt(111) 上的光化学，并且随着层数的增加逐渐改变为块状铜表面的光化学。此外，我们将氧覆盖的Pt(111)上的光化学与干净的Pt(111)上的光化学进行了比较，发现产生了甲氧基并且反应在没有甲基产物中毒的情况下进行。