Dissolved oxygen electrochemical sensor
An electrochemical and sensor technology, applied in the field of dissolved oxygen electrochemical sensors, can solve problems such as the service life of the sensor is only 12 hours, the hidden danger of metal ion deposition, and the lack of an ideal dissolved oxygen sensor, so as to reduce the electrode corrosion reaction and improve the response. Current diffusion rate, the effect of avoiding electrode corrosion
Inactive Publication Date: 2007-09-26
ZHEJIANG UNIV
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Problems solved by technology
[0004] Dissolved oxygen sensor has been developed so far, and its technology is relatively mature, but there are still some shortcomings that cannot be overcome, especially the life of the sensor when it is used in a solution containing high concentration of chloride ions
For example, when used to detect dissolved oxygen in seawater, due to the presence of chloride ions, the sensor electrodes will corrode after the voltage is applied, so there is still no ideal dissolved oxygen sensor that can be used for seawater pollution detection.
[0005] At present, most dissolved oxygen sensors use the method of covering electrodes with polymer films such as cellulose acetate, PTFE and PVC [3, 4, 5]; the disadvantage of cellulose acetate is that the polymer film will The service life of the sensor is only 12 hours due to the blockage of calcium ions in the water; the service life of the dissolved oxygen sensor made of PTFE film covered electrodes is only 24 hours; although the PVC film can reduce the problem of calcium ion blockage, the service life exceeds 72 hours, but There is indeed a limitation on the shelf life of PVC, and when it is used for the actual measurement of dissolved oxygen in general river water, the problem of metal ion deposition will be a major hidden danger
In addition, in the above method, the working electrode and the counter electrode are made of the same metal material. In a humid environment, after an external voltage is applied, corrosion reactions will also occur on the electrodes.
Method used
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Embodiment 1
[0013] An electrochemical sensor for dissolved oxygen, interdigitated gold electrode 2, interdigitated Pt electrode 3, Ag / AgCl electrode 4 and corresponding gold pads 5a, 5b, 5c are printed on Al 2 o 3 Made on a ceramic substrate 1, the width and spacing of interdigitated gold electrodes 2 and interdigitated Pt electrodes 3 are 0.5 mm, the length of Ag / AgCl electrodes 4 is 10 mm, and the sensing film 6 is dripped on the forked electrodes by polystyrene solution. The finger gold electrode 2 and the interdigital Pt electrode 3 are spin-coated with a gluing machine and then cured by ultraviolet light for 12 hours. The area of the sensing film 6 is 25.25mm 2 , An insulating layer 7 covered with insulating glue is provided on the substrate, epoxy resin AB glue is coated on the gold pads 5a, 5b, 5c; the thickness of the sensing film 6 is 200-300nm. As shown in Figure 1 and Figure 2.
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Abstract
This invention relates to one solution oxygen electrical and chemical sensor, which adopts wire network print technique to process cross gold electrode, cross Pt electrode, Ag / AgCl electrode and relative gold weld disc on A1203 ceramics base board; dripping the polyphenylacetylene liquid into cross gold electrode and cross electrode to remove rotation coating and lighted by ultraviolet light for 12 hours to fix sensor film with thickness for 200 to 300nm; coating the electrode except film and Ag / AgCl area by insulation glue to form insulation layer and the gold weld disc is coated with epoxy resin.
Description
technical field [0001] The invention relates to an electrochemical sensor, in particular to a dissolved oxygen electrochemical sensor. Background technique [0002] Due to the rapid development of industry in recent years, the pollution of water sources has become increasingly serious, and the quality of water sources needs to be controlled. For the monitoring of water source quality, dissolved oxygen in water is generally used as an indicator of the degree of water pollution. If the dissolved oxygen in the water is high, it means that the water quality is better; on the contrary, if the dissolved oxygen in the water is very low, it means that the water quality is seriously polluted. [0003] The measurement of dissolved oxygen in water mainly depends on the dissolved oxygen sensor. The dissolved oxygen sensor was developed by Clark[1] as early as 1956. Its structure is a film covering the electrode, which separates the liquid electrolyte and the electrode from the tested ...
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Inventor 郭希山赵子恺王立人
Owner ZHEJIANG UNIV