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The research on optical chemical sensing characteristics of the dye-doped sol-gel coating film

染料掺杂溶胶-凝胶涂膜的光化学传感特性研究

基本信息

批准号：
09650023
负责人：
TAKAHASHI Yoshihiro
金额：
$ 1.79万
依托单位：
Aichi Institute of Technology
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 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650023/
关键词：
Optical pH sensing Optical humidity sensing Fluorescence Sol-gel coating film Organic dye Acid-base equilibrium Energy transfer ゾル-ゲル法ディップコーティング膜クマリン6 フルオレセインローダミン6G ゾルーゲル法クマリン4色素発光強度比

项目摘要

The application to optical pH sensor and optical humidity sensor as an optical chemical sensor based on the fluorescence of a dye-doped sol-gel coating film was considered, and the effect based sample preparation condition of sensing characteristics was examined.1. Dye-doped sol-gel coating film as an optical pH sensor.The fluorescence of coumarin-4-, coumarin-6- and fluoresein-doped sol-gel coating films shows pH dependence so that the molecule may show acid-base equilibrium. Therefore, it has the application possibility to the optical pH sensor. These optical pH sensing characteristics are as follows.(1) It is excellent in respect of response range and response speed for pH of the fluorescence intensity. However, it is lacking for the stability for pH of the fluorescence intensity.(2) The method for using the intensity ratio at two fluorescent wavelengths for the improvement on the stability was done in a coumarin-4-doped sol-gel coating film. As the result, it was proven that the effect by the preparation condition was big, though to some extent improvement was accepted.And, when rhodamine6G is doped together with coumarin6 and fluorescein in sol-gel coating films, its emission showed energy transfer from coumarin6 and fluoresein to rhodamine6G.The fluorescent pH dependence of rhodamine6G by the energy transfer has the application possibility to the optical pH sensor.2. Dye-doped sol-gel coating film as an optical humidity sensor.The fluorescence of coumain-4-, coumarin-6-, fluoresein- and rhodamine6G-doped sol-gel coating films changes by moisture, and there is the application possibility to the optical humidity sensor based on the fluorescence. It was proven that the fluorescent humidity dependence was classified into two of (1) the fluorescence quenching of molecular aggregation and the monomer molecule, and (2) change of the fluorescence by acid-base equilibrium.

研究了基于染料掺杂溶胶-凝胶涂层荧光的光化学传感器在光学pH传感器和光学湿度传感器中的应用，考察了样品制备条件对传感特性的影响.染料掺杂的溶胶-凝胶膜作为pH传感器，香豆素-4-、香豆素-6-和荧光素掺杂的溶胶-凝胶膜的荧光具有pH依赖性，分子可能表现出酸碱平衡。因此，它具有应用于光学pH传感器的可能性。这些光学pH传感特性如下。(1)在荧光强度的pH响应范围和响应速度方面是优异的。然而，其缺乏荧光强度对pH的稳定性。(2)在香豆素-4掺杂的溶胶-凝胶涂层膜中进行了利用两个荧光波长处的强度比来改善稳定性的方法。实验结果表明，制备条件对罗丹明6 G的发光性能影响较大，但仍有一定的改善;当罗丹明6 G与香豆素6和荧光素共掺杂到溶胶-凝胶涂膜中时，其发光表现为从香豆素6和荧光素到罗丹明6 G的能量传递，这种能量传递导致的罗丹明6 G的荧光pH依赖性具有在光学pH传感器中应用的可能性.染料掺杂溶胶-凝胶薄膜作为光学湿度传感器，香豆素-4-、香豆素-6-、荧光素和罗丹明6 G掺杂溶胶-凝胶薄膜的荧光随湿度的变化而变化，具有应用于基于荧光的光学湿度传感器的可能性。结果表明，荧光湿度依赖性可分为两类：（1）分子聚集体和单体分子的荧光猝灭;（2）酸碱平衡引起的荧光变化。