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Development of Method to Separation and Punfication 0f Novel-Fullerene Corn-pound Materials Using Plasma Chromatography

等离子色谱分离纯化0f新型富勒烯复合材料方法的建立

基本信息

批准号：
12680471
负责人：
HIROTA Takamichi
金额：
$ 2.24万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12680471/
关键词：
Na-C_<60> Plasma Endohedral Metallofullerene Bias Control Method Radial-Deveded Electrodes Control and Separation of Lons in the Plasma Plasma Chromatography フラーレンプラズマ金属内包フラーレンフラーレン誘導体・重合物

项目摘要

The endohedral metallofullerene K@C_<60> was successfully formed by the energy and flux control of K^+ and C^-_<60> ions flowing into substrates in experiments of the thin-film formation with a potassiumfullerene (K^+_-C^-_<60>) plasma. Since the K@C_<60> production ratio to C_<60> was at most 30% and usually 5〜10% or less, however, it was difficult to clarify the relation between the plasma effect and encapsulation mecharuism. From the abovementioned viewpoint, the experiments were carried out by a sodiumfullerene (Na^+_-C^-_<60>) plasma, where the diameter of Na^+ is srmaller than that of K^+. The following results were obtained.According to the mass analysis of thin films formed on the substrates, the large massspectrum peak (Na(@)C_<60>) corresponding to the Naendohedral fullereoe is observed. The average intensity ratio of Na(@)C_<60> to C_<60> is turned out to be 30〜50%. Moreover, the Na(@)C_<60> production ratio to C_<60> in a narrow region of the substrate attains to 200% or more.When the substrate bias is chansed, the average spectrumpeak intensity of Na(@)C_<60> is found to give the maximum value at a specific voltage.The composition and structure of the thin film are directly investigated by the highresolution electron microscope (HREM) observation. A lot of C_<60> molecules with dark shadows around the centers are observed over the image of the thin film in the narrow region of the substrate. The round material imaged by the HREM is considered to be C_<60> encapsulating Na inside the cage, because the Na^+ diameter almost corresponds to the dark shadow diameter.It can be said that a large amount of production of the Na-C_<60> compound materials containing Na@C_<60> facilitates the constituent analysis and structure observation for the purpose of clarifying their physical and chemical properties. This work is also important in the sence of establishing the method of forming fullerenebased thin films with new functions.

在<60>富勒烯钾<60>（K^+_-C^-_）等离子体成膜实验中，通过控制K^+和C^-_离子流入基<60>片的能量和流量，成功地形成了内嵌金属富勒烯K@C_。但由于K@C_2<60>的产率与C_2<60>之比最多为30%，通常为5 ~ 10%或更低，因此很难阐明等离子体效应与包封机制之间的关系。从上述观点出发，实验是在钠富勒烯（Na^+-C^-<60>）等离子体中进行的，其中Na^+的直径小于K^+的直径。结果表明：对衬底上形成的薄膜进行了质量分析，观察到一个大的质谱峰（Na（@）C_<60>），对应于纳氏富勒烯。Na（@）C_2与C_3的平均强度比<60><60>为30 ~ 50%。在衬底的一个狭窄区域内，Na（@）C_<60>2的产率达到C<60>_2的200%以上，当衬底偏压改变时，Na（@）C_2的平均谱峰强度<60>在特定电压下出现最大值，用高分辨电子显微镜（HREM）直接观察了薄膜的组成和结构。在<60>衬底的狭窄区域中，在薄膜的图像上观察到大量中心周围有阴影的C_分子。高分辨电子显微镜观察到的圆形物质被认为是笼状包裹Na的C_<60>，因为Na^+的直径几乎与黑影直径相对应，可以说，大量生产<60>含Na@C_的Na-C_化合物材料<60>有利于成分分析和结构观察，从而明确其物理化学性质。这一工作对于建立具有新功能的富勒烯基薄膜的制备方法也具有重要意义。