| Project/Area Number |
12680471
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
プラズマ理工学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
HIROTA Takamichi Tohoku University, Grad. School of Eng., Research Associate, 大学院・工学研究科, 助手 (80260420)
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| Co-Investigator(Kenkyū-buntansha) |
KANEKO Toshiro Toshoku University, Grad. School of Eng., Bcsearch Associate, 大学院・工学研究科, 助手 (30312599)
HATAKEYAMA Rikizo Tohoku University, Grad. School of Eng., Professor, 大学院・工学研究科, 教授 (00108474)
OOHARA Wataru Tohoku University, Grad. School of Eng., Research Associate, 大学院・工学研究科, 助手 (80312601)
佐藤 徳芳 東北大学, 大学院・工学研究科, 教授 (40005252)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | 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 |
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| Research Abstract |
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.
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