The Development Of A New Type Dissolved Oxygen Sensor

In this dissertation, we have manufactured the probe unit of a new type dissolved oxygen (DO) detector. Beside sensing fast and readily of the DO detector, it has concise structure and relatively small dimension. We have developed the preparation and modification methods of the working electrode involved, and optimized the assembling of the probe unit. Then, we gave detail valuation of its performance. The dissertation covered following aspects:1. We have developed a method to prepare microelectrode array electrode with the aid of certain kind of equipment based on the laboratory environment. We started the preparation simply using operation by hand-working, and also established the criterion to evaluate the success of the preparation. Further, we improved the preparation approach utilized the modified machine to assist the work;2. We optimized the assembling of the probe unit, and evaluated its electrochemical performance. We have fabricated prototype of a new DO detector in cooperation with our partner.3. We have developed a templeteless, surfacantless, simple electrochemical route to prepare dendritic gold nanostructure. The formation mechanism related to experimental conditions was discussed. The as-prepared modified electrode has excellent catalytic activity to oxygen reduction in neutral KCl solution.4. We have developed a one-step facile route to fabricate Pd modified porous Au films. The as-prepared Pd modified electrode was used to the detection of oxygen and showed a good sensitivity.