The Formation Mechanism of Fullevene Network

Fullevene网络的形成机制

• 批准号: 08404041
• 负责人: ACHIBA Yohji
• 金额: $ 20.93万
• 依托单位: Tokyo Metropolitan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08404041/
• 关键词: Highen Fullerene; Metal encapsulates Fullerene; Single-Wall Carbon Nonotube; Formation Mechanism; Network

Supported by the grant-in-aid (A)(2), the following research results have been obtained. (1)In the laser furnace apparatus, when the graphite rod was vaporized for making fullerenes, the intense emission from the carbon particles could be seen. When the image of this emission was taken as a function of the delay after the timing of the laser vaporization of the graphite rod, by use of a high speed video camera (time resolution : 25 micro second), it was found that C_2 emission was dominant in the early stage, while in the later stage, the black body emission was found to be the dominant process, from which the internal temperature of the carbon particles was etimated. A systematic study of this emssion taken under several vaporization conditions has indicated that when the yield of the fullerenes was high, the lifetime of the emission from the carbon particles seemed to be longer. (2)using REMPED spectroscopy technique, the electronically excited state of the odd-numbered carbon cluster negative ion C_n^- (n=7,9,11) has been investigated. (3)Using a laser furnace apparatus, the formation mechanism of the endohedral fullerenes has been investigated. It has been found that the relative atomic ratio and the ambient temperature inside the electric furnace were the key parameters for increasing the yield of endohedral fullerenes. (4)Photoelectron spectroscopy combined with the laser vaporization technique indicated that when the laser vaporization condition has been varied, the ratio between the conformational isomers (of the linear form and of the ring form) has been drastically changed.

在资助项目（A）（2）的支持下，取得了以下研究成果。(1)In在激光炉装置中，当石墨棒被汽化以制备富勒烯时，可以看到来自碳颗粒的强烈发射。当使用高速摄像机拍摄该发射的图像时，该图像是石墨棒的激光汽化定时之后的延迟的函数（时间分辨率：25微秒），发现在早期以C_2发射为主，而在后期以黑体发射为主，从该温度计算碳颗粒的内部温度。在几种蒸发条件下对这种发射进行的系统研究表明，当富勒烯的产率高时，碳颗粒的发射寿命似乎更长。（2）利用REMPED光谱技术研究了奇数碳团簇负离子C_n^-（n= 7，9，11）的电子激发态。（3）利用激光炉研究了内嵌富勒烯的形成机理。结果表明，相对原子比和电炉内环境温度是提高内嵌富勒烯产率的关键参数。（4）光电子能谱结合激光蒸发技术表明，当激光蒸发条件改变时，构象异构体（线型和环型）之间的比例发生了剧烈的变化。

项目成果

T.Moriwaki, K.Kobayashi, M.Osaka, H.Shiromaru, and Y.Achiba: "Dual Pathway of Carbon Cluster Formation in the Laser Vaporization" J.Chem.Phys.107. 8927-8932 (1997)

T.Moriwaki、K.Kobayashi、M.Osaka、H.Shiromaru 和 Y.Achiba：“激光汽化中碳簇形成的双重途径”J.Chem.Phys.107。

S.Suzuki et al.: "Time-of-flight mass and photoelectron spectroscopy stndy of LaCn^-" Z.Phgs.D.(in press).

S.Suzuki 等人：“LaCn^- 的飞行时间质量和光电子能谱标准”Z.Phgs.D.（出版中）。

T.Wakabayashi, T.Momose, T.Shida, H.Shiromaru, M.Ohara, and Y.Achiba: "Preferential Formation of C_<10>^- Upon Tandem Irradiation of Graphite With IR and UV Laser Pulses" J.Chem.Phys.107. 1152-1155 (1997)

T.Wakabayashi、T.Momose、T.Shida、H.Shiromaru、M.Ohara 和 Y.Achiba：“用红外和紫外激光脉冲串联照射石墨时优先形成 C_<10>^-” J.Chem

T.Wakabayashi et al.: "Preferential Formation of Go Upon Tandem Irradiation of Graphite with IR and UV Laser Pulses" J.Chem.Phys.107. 1152-1155 (1997)

T.Wakabayashi 等人：“采用红外和紫外激光脉冲对石墨进行串联辐照的优先形成”J.Chem.Phys.107。

T.Moriwaki et al.: "Dual Pathway of Carbon Clusters Formation in the Laser Vaporization" J.Chem.Phys.107. 8927-8932 (1997)

T.Moriwaki 等人：“激光汽化中碳簇形成的双重途径”J.Chem.Phys.107。