| The preparation of chemical and biological sensors is one of the hot topics of the field of analytical chemistry. There are many reports on various kinds of chemical and biological sensors in literature. Oxygen is considered to be one of the most important elements for anyone to be alive. So the preparation of oxygen sensors, especially dissolved oxygen sensors with high sensitivity, have gradually become the major interest aims of the field of optical chemosensor. The sensitivity of the existed dissolved sensors is not satisfying. Much more work need to be done. The paper aims at the preparation of an oxygen sensor immobilizing a ruthenium complex by sol-gel support system and study the characters.The Ru( II) diimine complexes are the most widely used of all the oxygen sensitive materials. There are many reports about detection on gaseous oxygen and dissolved oxygen in literature, and the response of the sensors to oxygen based on the sensitive material of the Ru( II) complexes accord with Stern-Volmer equation. However, the question confronted with frequently is that the salt such as chloride is dissolvable. So the dyes may be leak when it is immobilized in the medium.The oxygen sensitive material preparation of di(2,2'-bipyridine) (4,7-diphenylphenanthroline) ruthenium( II) chloridize [Ru(bpy)2(dpp)Cl2] has been done at first. The fluorescence of Ru(bpy)2(dpp)Cl2 can be quenched by oxygen, and sol-gel is a good method to immobilize the complex, so the preparation of the fluorescence oxygen sensor has been done. Due to the good response, reproducibility and stability of the oxygen sensor, it should be a promising future in detecting oxygen sensor. |
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