All-solid-state pH sensor for deep sea and preparation method thereof

Abstract

The invention relates to an all-solid-state pH sensor and a preparation method thereof, and belongs to the technical field of pH sensors. The all-solid-state pH sensor comprises an electrode protection shell (7); a pH sensor fixed by a packaging material (5) and a sealing and packaging material (8) for solid sealing are arranged in the electrode protection shell (7); and a protection cover (9) is arranged at the lower end. The pH sensor comprises an all-solid-state iridium oxide pH response electrode (3) and an all-solid-state Ag / AgX reference electrode (4), wherein the all-solid-state iridium oxide pH response electrode (3) comprises an iridium metal core (2) and a layer of iridium oxide film (1) wrapping the outer surface of the iridium metal core (2); the iridium oxide film (1) is prepared and generated by adopting a high-temperature thermal oxidation method; and the all-solid iridium oxide pH response electrode (3) and the all-solid Ag / AgX reference electrode (4) are respectively connected with a lead (6). The sensor device has the characteristics of high pressure resistance, high stability, small size and the like, and can be applied to a deep sea high-pressure environment.

Description

technical field [0001] The invention belongs to the technical field of sensor analysis and testing, and particularly relates to a deep-sea all-solid-state pH sensor and a preparation method thereof, which includes preparing all-solid-state iridium oxide (IrO x ) electrode, the all-solid-state Ag / AgX reference electrode and its packaging technology were prepared by high pressure molding. Background technique [0002] Traditional pH composite glass electrodes have problems such as high impedance and easy breakage, and are difficult to apply in extreme environments such as deep sea and highly corrosive systems, which hinder the detection of pH in extreme environments. [0003] IrO x as H + Responsive electrodes have the characteristics of wide response range and fast response speed, and are suitable for electrode cores of pH-responsive electrodes. Optimizing their preparation methods has always been a research hotspot. Traditional reference electrodes such as silver / silver c...

AI Technical Summary

Problems solved by technology

Traditional reference electrodes such as silver / silver chloride electrode, the tube body is saturated potassium chloride solution, and the tube body is mostly made of glass material, which is difficult to apply to high-pressure environments; simply use silver wire with silver chloride coating as a reference , the coating is easy to fall off during use, the service life is short, the stability is poor, and it is more difficult to apply it to high-pressure environments such as deep sea

[0004] In addition, the packaging problem of electrodes in high-voltage environments such as deep seas is also a major problem that limits the application of conventional electrodes in high-voltage environments such as deep seas.

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