CRYSTAL STRUCTURAL CONTROL OF ULTRA-THIN ORGANIC FILMS BY MIXING LB TECHNIQUE INTRODUCING SPACER MOLECULES

引入间隔分子的混合 LB 技术对超薄有机薄膜的晶体结构控制

基本信息

批准号：
09650020
负责人：
SHIRATORI Seimei
金额：
$ 2.18万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Lateral spacing of the molecules in the Langumuir-Blodgett (LB) films were controlled by introducing "Spacer Molecules" such as pyrrole or fullerene (C60) molecules into arachidic acid (C20) LB films. The transformation of the molecular arrangement of C20 LB film was studied with an increase of pyrrole (py) quantity or C60 quantity which we used as guest molecules to the host molecules, C20. The change of molecular occupation area of a C20 LB films was estimated by pressure-area curves, quartz crystal microbalance method and atomic force microscopy (AFM). It was found that that a C20 LB film can contain 1.5 times as large as C20 molecules. The observation by AFM showed that the enlargement of the occupation area of C20 upon addition of spacer molecules, however, the molecules of C20 maintained the highly ordered molecular arrangement. The change of the crystal structure observed by AFM agreed well with the results of computer simulation based on molecular mechanics. The experimental and computer simulation results showed that the lattice constant of a C20 LB film is easy to control by the quantity of spacer molecules contained in the LB film.Using these characteristics, several kinds of mixed LB films, composed of C20 and C60, were prepared and the adsorption characteristics of gas molecules to these films were studied using a quartz crystal microbalance. The dependence of the amount of the gas adsorbed on the number of layers reveal that the permeability of the gas molecules into the LB films remarkably increase with an increase of the intermolecular spacing of LB films. Gas molecules with different sizes or structure were sifted by using C60 containing LB films. This characteristic of the LB films containing C60 can be applied to a novel gas sensor with a molecular sifter function.

通过引入诸如吡咯或富勒烯（C60）分子等“间隔分子”（C20）LB膜的“间隔分子”（C20）LB膜来控制Langumuir-Blodgett（LB）膜中分子的侧间距。研究了C20 lb膜的分子排列的转化，并以吡咯（Py）量或C60量增加，我们将其用作宿主分子的来宾分子C20。通过压力区域曲线，石英晶体微平衡法和原子力显微镜（AFM）估算了C20 lb膜的分子占用面积的变化。已经发现，C20 lb膜的包含1.5倍的大小是C20分子。 AFM的观察结果表明，添加间隔分子后，C20的占用面积扩大，但是，C20的分子保持了高度有序的分子排列。 AFM观察到的晶体结构的变化与基于分子力学的计算机仿真结果一致。实验和计算机模拟结果表明，通过在LB膜中包含的间隔分子的数量来易于控制C20 LB膜的晶格常数。使用这些特征，制备了由C20和C60组成的几种特征，由C20和C60组成，并制备了这些膜对这些膜的吸附特性，这些特征是使用这些膜的吸附特性。吸附的气体量的依赖性表明，随着LB膜的分子间间距的增加，气体分子对LB膜的渗透性明显增加。使用含有LB膜的C60筛选具有不同大小或结构的气体分子。包含C60的LB膜的这种特征可以应用于具有分子Sifter函数的新型气体传感器。