2D-Highly Ordered Epitaxial Adlayers of Fullerene, Fullerene oligomer and Fullerene Polymers Prepared by "Wet Process"

“湿法”制备富勒烯、富勒烯低聚物和富勒烯聚合物的二维高度有序外延吸附层

基本信息

批准号：
12450023
负责人：
KUNITAKE Masashi
金额：
$ 9.22万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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

项目摘要

"Wet process" techniques, which consisted of the simple transfer of Langmuir films, were developed and investigated in order to form highly-ordered epitaxial adlayers of fullerene, their derivatives and other aromatic molecules on single crystal metal surfaces.We found that the simple transfer of Langmuir films at the air-water interface allowed us to prepare epitaxial adlayers of fullerenes on Au(111) surfaces with ambient conditions. Furthermore, the improved "wet process" method, "electrochemical replacement method" was proposed. The method consists of the transfer of Langmuir films of C_60 onto iodine-modified Au(111) surfaces at air-water interface and followed by the electrochemical removal and the replacement from iodine adlayers to C_60 adlayers in solution. The C_60 adlayers prepared by this method showed excellent quality and uniformity, and they were essentially same as epitaxial adlayers prepared by sublimation. A highly-ordered epitaxial adlayer of coronene on the Au(111) surface was also prepared by the technique.The structural identification of isomers of the novel carbon allotrope C_190, that is, the trimer of fullerene C_60, prepared by the mechanochemical reaction of C_60 under "high-speed vibration milling" conditions were demonstrated, for the first resolution STM imaging. The results of the present STM technique clearly provide the visual evidence that an HPLC-separeted fraction is composed of only an isomer with "cyclic triangular" shape while another fraction consists of totally different isomers with "extended" structures. These results are in good agreement with theoretical prediction.

开发和研究了由Langmuir膜的简单转移组成的“湿过程”技术，以形成富勒烯的高度订购的外部贴剂，它们的衍生物和其他芳族分子在单晶金属表面上。环境条件。此外，提出了改进的“湿过程”方法“电化学替代方法”。该方法包括将C_60的Langmuir膜转移到空气水接口处的碘修饰的AU（111）表面，然后进行电化学去除以及从溶液中的C_60 Adlayers替换。通过这种方法制备的C_60 adlayer层具有出色的质量和均匀性，并且与通过升华制备的外延adlayer剂基本相同。还通过该技术制备了冠状动脉（111）表面上的冠状动脉上的外延adlayer。当前的STM技术的结果清楚地提供了视觉证据，即HPLC分离的部分仅由具有“环状三角形”形状的异构体组成，而另一个分数由具有“扩展”结构的完全不同的异构体组成。这些结果与理论预测非常吻合。