Optical Ion Sensors Based on LB Films

为了设计基于模式识别的多通道传感系统，研究了十八烷基罗丹明B双层膜对多种无机阴离子的荧光响应。十四个阳离子两亲分子，双链两亲分子和单链两亲分子与刚性芳香段，被用来作为传感双层膜。双层膜的荧光响应不仅强烈地依赖于无机阴离子，而且还与形成双层膜的两亲分子的化学结构有关。流体双层膜比凝胶状态的双层膜更敏感。碘离子对大多数双层膜有荧光猝灭作用。碳酸根离子特异性地增强单链紫精两亲物双层膜的荧光强度。本文研究了阳离子两亲物与聚苯乙烯磺酸盐、聚乙烯基硫酸盐和羧甲基纤维素复合的LB膜的双层膜荧光响应。相反电荷的聚合物的化学结构强烈地影响荧光响应，即使相同的两亲物被用作单层形成化合物。多通道离子传感器分子膜的荧光特性的多样性是多通道离子传感器分子设计的基础。

In order to design a multi-channel sensing system based on pattern recognition, fluorescence response of bilayr membranes having octadecylrhodamine B to various inorganic anions were investigated. Fourteen cationic amphiphiles, double chain amphiphiles and single chain amphiphiles with a rigid aromatic segment, were used as the sensing bilayr membranes. Fluorescence response of bilayr membranes was strongly depend not only on inorganic anions but also on the chemical structure of the bilayr forming amphiphile. Fluid bilayr membranes were more sensitive than those of gel state. Iodide ion act as a fluorescence quencher of the most bilayr membranes. Carbonate ions specifically enhanced fluorescence intensity of the bilayr membrane of a single chain viologen amphiphile. Based on the results of the bilayr membranes fluorescence responses of Langmuir-Blodgett films of the cationic amphiphiles complexed with counter charged polyelectrolites, Poly(stirenesulfonate), poly(vinylsulfate), and carboxymethyl-cellulose, were investigated. The chemical structure of the counter charged polymer strongly affected the fluorescence response even if the same amphiphile was used as a monolayr forming compound. A large variety of the fluorescence of the molecular films is essential to the molecular design of the multi-channel ion sensors.