Study on New LB films with Molecular-Janction System

本研究的目的是建立一种在脂类单层中实现功能分子的图案化区域的“新的LB方法”，通过组合这些图案化的单分子膜来实现三维集成分子系统，并最终将该系统应用于电子器件。目前已发展出三种“新的LB方法”：“部分浇铸”、“液滴表面浇铸”和“吸附LB”。在部分铸造法中，将外力局部施加到水亚相上的单分子膜上，以打开一个小孔，并向孔中注入功能分子。外力是一种物理作用力，如电场、弯月面区域内的力或框架力等。通过使用弯月面区域可以形成导电聚合物LB膜的细丝，这将在下文中提到。在部分浇铸方法中，最现实的是液滴表面浇铸方法，其中一个小水滴(几十微米到1毫米…直径更大)从锥形玻璃吸管中推出，功能分子被浇铸在液滴上。如果衬底表面附着在液滴上，扩散的分子就会转移，并在其上沉积图案化的分子膜。在吸附LB法中，由于染料分子的化学结构和极性而产生的自组织特性和可控制的电场被用来在LB膜中制备分子结或聚集体系。其中最突出的是在集成声表面波器件上通过液滴表面浇注沉积多个脂质分子膜，以实现高灵敏度(几个ppm范围)的声表面波多通道气体或气味传感器。导电聚合物在弯月面区域通过在ITO涂层的衬底上铺展脂质材料和吡咯在水面上进行电聚合来实现细丝的形成。该技术可用于分子器件的布线。此外，购买的扫描探针显微镜使我们能够观察到沉积的分子膜的分子图像、表面形态和表面电位图像。较少

The purpose of the present study is to establish the "new LB method" by which a patterned region of functional molecules can be implemented in a lipid monolayr, to realize three-dimensional integrated molecular system by combining the pattterned monolayrs, and to finally apply the system to a electronic device.The three "new LB methods" have been developed ; "partial-casting", "droplet-surface casting" and "adsorption LB" methods. In the partially-casting method, a outer force is applied locally onto a monolayr on water subphase in order to open a small hole, and functional molecules are injected into the hole. The outer force is a physical one such as an electric field, forces in a meniscus region or by a frame, etc. The filament of a conduting polymer LB film can be formed by using the meniscus region, which will be mentioned below. The most realistic one among partial-casting methods is the droplet-surface casting method, in which a small water droplet (several tens of mu m to 1 mm … More in diameter) is pushed out of a tapered glass pipette and functional molecules are cast on the droplet. If a substrate surface is attached onto the droplet, the spread molecules are transferred and a patterned mlecular film can be deposited on it. In the adsorption LB method, a self-organizing property due to the chemical structures and the polarity of dye molecules and an controling electric field are used for preparing molucular junctions or aggregation system in LB films..Several applications have been found by the new LB method. One of the most prominent ones is the deposition of plural lipid molecular films by the droplet-surface casting on integrated SAW devices for realization of an highly sensitive (several ppm range) SAW multi-channel gas or odor sensors.The filament formation of conducting polymer in a meniscus region can be done by electro polymerization of pyrrole on to an ITO coated substrate after spreading a lipid material and pyrrole on water surface. The technique might be used for wiring to molecular devices.Furthermore, the purchased scaning-probe microscope enabled us to observe the molecular images, surface morphology and surface-potential images of the deposited molecular films. Less