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Creation of New Functions and Reaction Sites by Molecular Design for Various Gases-C_<60>-Alkali-Metals

通过分子设计为各种气体-C_<60>-碱金属创造新功能和反应位点

基本信息

批准号：
11640586
负责人：
ICHIMURA Kenji
金额：
$ 2.3万
依托单位：
KUMAMOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

In the C_<60> and carbon nanotube systems, characteristic interactions with rare gases are found in addition to the interaction with nitrogen, hydrogen and so on.Na-C_<60> system does not show the superconductivity, while ternary system with nitrogen or hydrogen becomes to have a superconductive phase. For Na-H-C_<60>, C_<60> and carbon nanotube systems, the interactions with rare gases such as He, Ne, Ar, Kr and Xe are investigated by means of mass-analyzed thermal desorption, X-ray photoelectron spectroscopy, ESR and calculations of electronic states. The samples of Na-H-C_<60>, C_<60> and carbon nanotubes are transferred in-situ to the tube equipped with the ultra-high vacuum system, and heated at 653K or 1073K.Then the samples are exposed to gases under the conditions of 273-473K and around 1 atm. When the sample is heated, the desorbed gases are analyzed by use of mass analyzers. By using the glove bag, the sample is transferred in-situ to the X-ray photoelectron spectrometer (VG ESCA LAB MkII), and X-ray photoelectron spectra are measured by using MgK_α. The desorption peaks are observed in the temperature region where the van der Waals interactions are not considered. For the sort of sample and rare gas, the desorption profiles are different from each other. These characteristics does not depend on the evacuation time. After the exposure to rare gases, the C1s and valence band XPS spectra change from the original one. In the case of Ar, a large chemical shifts to the higher binding energy side are observed. These facts on the characteristic interaction of rare gases such as He, Ne, Ar, Kr and Xe is first report. New catalytic activities are also found to occur at the characteristic files of solid sites.

在C_2<60>和碳纳米管体系中，除了与氮、氢等的相互作用外，还发现了与稀有气体的特征相互作用，Na-C_<60>2体系没有表现出超导电性，而与氮或氢的三元体系出现了超导相。对于Na-H-C_2<60>、C_3<60>和碳纳米管体系，用质量分析热脱附、X射线光电子能谱、ESR和电子态计算等方法研究了它们与He、Ne、Ar、Kr和H2O等稀有气体的相互作用.将Na-H-C_2<60>、C_2<60>和碳纳米管样品原位转移到配有超高真空系统的真空管中，在653 K或1073 K下加热，然后在273- 473 K和1 atm左右的条件下暴露于气体中。当样品被加热时，解吸的气体通过使用质量分析仪进行分析。用手套袋将样品原位转移到X射线光电子能谱仪（VG ESCA LAB MkII）上，用MgK_α测量X射线光电子能谱。在不考虑货车范德华相互作用的温度范围内观察到脱附峰。不同样品和稀有气体的解吸曲线不同。这些特性不依赖于疏散时间。在暴露于稀有气体后，C1 s和价带XPS谱从原来的一个改变。在Ar的情况下，观察到向较高结合能侧的大化学位移。这些关于稀有气体如He、Ne、Ar、Kr和Ar的特征相互作用的事实是首次报道。新的催化活性也被发现发生在固体位的特征文件。