权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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.

为了在单晶金属表面上形成富勒烯及其衍生物和其它芳香族分子的高度有序的外延吸附层，我们发展和研究了“湿法”技术，即简单的朗缪尔膜转移技术，发现朗缪尔膜在空气-水界面的简单转移使我们能够在室温条件下在Au（111）表面上制备富勒烯的外延吸附层。在此基础上提出了改进的“湿法”方法--“电化学置换法”。该方法包括在空气-水界面上将C_（60）的Langmuir膜转移到碘修饰的Au（111）表面，然后在溶液中进行电化学去除和碘吸附层置换为C_（60）吸附层。该方法制备的C_（60）吸附层质量好、均匀性好，与升华法制备的外延吸附层基本相同。利用该技术在Au（111）表面制备了一种高度有序的晕苯外延吸附层，并对C60在“高速振动研磨”条件下的机械化学反应制备的新型碳同素异形体C190（富勒烯C60的三聚体）的异构体进行了结构鉴定，用于STM成像。本STM技术的结果清楚地提供了直观的证据，即HPLC分离的馏分仅由具有“环状三角形”形状的异构体组成，而另一个馏分由具有“扩展”结构的完全不同的异构体组成。这些结果与理论预测相吻合。