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Fabrication and Evaluation of Nanoscale Quantum Structure Using Functional Organic Molecules

使用功能有机分子制备和评估纳米级量子结构

基本信息

批准号：
11305007
负责人：
KUWAHARA Yuji
金额：
$ 27.59万
依托单位：
OSAKA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The aim of this research is to construct one-dimensional molecular wires, especially, conducting nanowires, and to control their patterns on the solid surface, consequently, fabricating single-electron tunneling device with organic molecules. In addition, independently-driven double-tip scanning tunneling microscope (WT-STM), which is a novel system to evaluate functionalities of such nanoscale structures, is newly constructed.This year, we investigated the two-dimensionally ordered structures of two component molecular monolayers, in which the molecules of diacetylene compounds and fatty acid lay parallel to the surface on the underlying HOPG. The possibility of obtaining the microscopically mixed regions varied depending on the ratio of the relative lengths of the two molecules. Poly-diacetylene molecular wires can be successfully fabricated at intended positions on the surface using chain polymerization by applying pulsed bias voltage from the STM tip.We have evaluated the conductivity of ultrathin molecular sheet of diacetylene compounds using WT-STM. We made the sample of six layers with poly-diacetylene compounds by LB method and irradiation of UV light. The distances of the two tips were varied from sub-micron to hundreds microns. Obtained results showed a significantly high conductivity of its film compared with that of the bulk structure. It is considered that electronic feature of one-dimensional and microscopic structures of molecular systems are quite different from that of three dimensional and macroscopic, that is, bulk molecular system. And this result is quite promising for the constructions of nanoscale molecular-based devices with various noble functions.

本研究的目的是构建一维分子线，特别是导电纳米线，并控制其在固体表面的形貌，从而制作单电子隧穿器件。此外，我们还建立了独立驱动的双针尖扫描隧道显微镜（WT-STM），这是一种新的系统，可以用来评估这种纳米结构的功能。今年，我们研究了双组分分子单分子膜的二维有序结构，其中二乙炔化合物和脂肪酸分子平行于下面的HOPG表面。获得显微镜下混合区域的可能性取决于两种分子的相对长度的比率。通过STM针尖施加脉冲偏压，利用链式聚合法在表面的预定位置成功地制备了聚二乙炔分子线，并利用WT-STM对聚二乙炔分子片的导电性进行了研究。我们用LB法和紫外光照射的方法制备了聚二乙炔化合物的六层样品。两个尖端的距离从亚微米到数百微米不等。所得结果表明，其膜的导电性显着高于体结构。认为分子系统的一维微观结构的电子特性与三维宏观的体分子系统的电子特性有很大的不同。这一结果对于构建具有多种功能的纳米级分子基器件具有重要意义。