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Synthesis of fullerene encased single-walled carbon nanotube by means of electro-chemistry

电化学法合成富勒烯包裹的单壁碳纳米管

基本信息

批准号：
14540545
负责人：
BANDOW Shunji
金额：
$ 2.43万
依托单位：
Meijo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540545/
关键词：
doping peapods double-walled carbon nanotube nanotube ピーポッド

项目摘要

By using the electro-chemistry method, doping of Fullerenes within the single-wall carbon nanotube (SWNT) was carried out from the toluene solution of C60 with electrolyte of lithium-perchiorate in DMF. Reduction voltage of ca. -0.5 V for C_<60> fullerene was applied in order to dope the fullerene molecules to SWNT mats, which were attached on the both ends of the Pt-plate electrodes. As results, SWNT mat attached on the positive electrode fully encases the C_<60> molecules. On the other hand, SWNT mat on the negative electrode rarely encases the fullerene ; most of the fullerenes were on the outside of the tube and Li was attached on the surface. These facts suggest that the anion of C_<60> was approached to the positive electrode due to electrostatic force and was efficiently encased within the SWNT. Thermal polymerization of C_<60> molecules, which is progressed in the nanotube space, was investigated detailedly by using Raman scattering spectroscopy in order to clarify the polymerization process from the array structure of C_<60> molecules to the tubular structure. As a result, 0.7 nm diameter tubes were formed inside the host tube and the diameter of the tube was changed to large diameters in order to match the inter-tube-wall separation with the van der Waals distance. We proposed a diameter transformation model for the inner tubes, which is based on forming the (9,0) zig-zag tube at first. Experiments of bromine doping to the double-wall carbon nanotubes were also carried out in the present program, and we found that the electrons can be transferred to the bromine molecules from the outer tubes, but they cannot be transferred from the inner tubes. This fact was also supported by the theoretical arguments based on the self-consistent tight, binding model calculation, which was carried out as the collaboration work with the group at Pennsylvania State University.

采用电化学方法，以C60甲苯溶液为原料，在DMF中以高硼酸锂为电解质，在单壁碳纳米管（SWNT）内掺杂富勒烯。对C_<60>的富勒烯施加约-0.5 V的还原电压，将富勒烯分子掺杂到附着在Pt-plate电极两端的SWNT垫子上。结果表明，附着在正极上的SWNT垫完全包裹了C_<60>分子。另一方面，在负极上的SWNT垫层很少包裹富勒烯；大多数富勒烯在管的外侧，Li附着在管的表面。这说明C_<60>的阴离子在静电力作用下接近正极，并被有效地包裹在SWNT内。为了阐明C_<60>分子从阵列结构到管状结构的聚合过程，利用拉曼散射光谱对在纳米管空间进行的C_<60>分子的热聚合进行了详细的研究。因此，在宿主管内形成直径为0.7 nm的管，并将管的直径改为大直径，以使管壁间距与范德华距离相匹配。提出了一种基于（9,0）字形管成形的内径变换模型。本程序还进行了溴掺杂双壁碳纳米管的实验，我们发现电子可以从外管转移到溴分子上，但不能从内管转移到溴分子上。这一事实也得到了基于自洽紧密约束模型计算的理论论证的支持，该计算是与宾夕法尼亚州立大学的研究小组合作进行的。