Preparation of new conducting Langmuir-Blodgett films using spontaneous chemical reaction on the water surface

最近我们发现简单氧取代TTF衍生物与脂肪酸的分子混合物在水面自发形成导电朗缪尔膜。该反应制备简便，对制备导电Langmuir-Blodgett（LB）薄膜具有重要意义。该项目的目的是发展这种方法，并将其作为即将到来的分子电子学研究领域的工具。在项目期间，我们进行了多次研究，获得了一些有用的知识，总结如下：1。探索新的分子组合通过上述反应，有可能制备出具有新的分子组合的新型导电LB膜。我们研究了新合成的TTF分子EDO-TTF-SC_<18>和BEDO-TSeF与乙酸（AcA）和硬脂酸（SA）的结合。对于EDO-TTF-SC_<18>/AcA和BEDO-TSeF/SA，上述反应继续得到导电LB膜。结果表明，该化学反应在氧取代TTF衍生物和脂肪酸的多种分子体系中进行。研究了BEDO-TTF与端羧基自组装单层（SAM）的反应，得到了导电自组装单层（SAM）。发现BEDO-TTF与端羧基SAM反应形成一层厚度为9Å的薄膜，但薄膜不均匀且含有大量孤岛。这些研究是作为与Dr.D.Villaume博士（IEMN-CNRS, ille, France）的一个研究小组的联合研究项目进行的。生物传感器的应用众所周知，有机导电材料可以作为安培酶传感器中电子转移的介质。作为该应用的第一步，我们研究了葡萄糖氧化酶在BEDO-TTF/SA LB膜中的固定化。结果表明，LB膜能吸附一定量的葡萄糖氧化酶。

Recently we found that the molecular mixture of simple oxygen substituted TTF derivatives and fatty acid spontaneously forms a conducting Langmuir film on the water surface. Such reaction is very useful for obtaining conducting Langmuir-Blodgett(LB) films with its simple and easy preparation aspect. The aim of this project is development of this method and establishing it as a tool for the upcoming research field of molecular electronics. During the period of project, we carried out several studies and obtained useful knowledge as being summarized in the followings ;1.Exploring new molecular combinationsThere is a possibility to prepare novel conducting LB films with new molecular combinations through the above reaction. We examined the newly synthesized TTF molecules, EDO-TTF-SC_<18> and BEDO-TSeF, to make the combination with acetic acid(AcA) and stearic acid(SA). For both EDO-TTF-SC_<18>/AcA and BEDO-TSeF/SA, the above reaction proceeded to provide conducting LB films. The results indicate that the chemical reaction proceeds in the wide variety of molecular system of oxygen substituted TTF derivatives and fatty acid.2.The reaction with carboxyl-terminated self assembled monolayer(SAM)The reaction between BEDO-TTF and carboxyl-terminated SAM was examined for obtaining electrical conducting SAM. It was found that BEDO-TTF reacted with carboxyl-terminated SAM forming a layer of its thickness 9Å, but the film was not homogeneous and contained a lot of islands. These researches were carried out as join research project with a research group of Dr.D.Villaume (IEMN-CNRS, Lille, France).3.Application for biosensorIt is known that organic conducting material can be used as a mediator for electron transferring in amperometric enzyme sensors. As the first step for this application, we examined the immobilization of glucose oxidase in the BEDO-TTF/SA LB films. The results indicate that a certain amount of glucose oxidase can be absorbed in the LB films.