| Summary: | 碩士 === 華梵大學 === 電子工程學系碩士班 === 98 === In the developing history of the sensor. The chemical sensor develops was more rapid in recent years which played an important role on the chemical analysis and clinical examination. In this study, the anodic oxidation method was used to fabricate titanium dioxide on the commercial pure Ti(99.5%), even the anodic titanium oxide. Initial anodic titanium oxide is amorphous leading to difficulty for sensing acid-base solution. Therefore annealing treatment is shows important. Anneal at low temperature with 350℃ and form anatase phase. Lead to anodic titanium oxide has excellent sensing for acid-base solution, hysteresis and repeatability are more better. Then manufacture sodium ion selective electrode. Its sensitivity was 56.51mV/decade when the concentration was at 10-5M~1M, and linearity is 0.998. The differential-voltage type of sodium ion selective device was built on the pure Ti substrate including a sodium selective membrane/ATO as a sensor 1, an ATO film as the sensor 2, and Ti as the reference electrode. The sensitivity was 49.95mV/decade when the concentration was at 10-5M~1M, and linearity is 0.999. The measurement results revealed that the differential-voltage sodium ion selective device could effectively solve the problem of the traditional electrode that needed a standard reference electrode. In addition, it could effectively low cost, produce a minimized and disposable selective electrode.
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