OPTICAL PH SENSOR WITH CO-INTERCALATION LAYER OF FLUORESCEIN AND HEPTANESULFONIC ACID SODIUM IN HYDROTALCITE AND ITS PREPARATION METHOD

摘要

An optical pH sensor with co-intercalation layer of fluorescein and heptanesulfonic acid sodium in a hydrotalcite is disclosed. The sensor consists of a conductive material and a hydrotalcite film co-intercalated by fluorescein and heptanesulfonic acid sodium, wherein the film is coated on the surface of the conductive material. Firstly, a precursor colloid solution of the hydrotalcite is prepared, and then the colloid solution of the hydrotalcite co-intercalated by fluorescein and heptanesulfonic acid sodium is obtained by ion exchange. Finally, the coated film is formed on the conductive substrate by an electrophoretic deposition method. A preparation method for sensor is also disclosed.