Sodium ion sensor and preparation method thereof

Abstract

The invention discloses a sodium ion sensor and a preparation method thereof. The sodium ion sensor comprises a substrate, a first sodium ion selection electrode, a second sodium ion selection electrode, a solid electrolyte reference layer, a sodium ion sensitive film, an insulating layer and a salt bridge, wherein the first sodium ion selection electrode comprises a first reaction electrode arranged on the substrate; the second sodium ion selection electrode comprises a second reaction electrode arranged on the substrate; the solid electrolyte reference layer covers the first reaction electrode and the second reaction electrode; the sodium ion sensitive film is arranged on the solid electrolyte reference layer; the insulating layer is arranged on the sodium ion sensitive film; a first opening and a second opening are formed in the insulating layer; the first opening is communicated with the sodium ion sensitive film to form a first reaction cavity; the second opening is communicated with the sodium ion sensitive film to form a second reaction cavity; the salt bridge is arranged on the insulating layer; one end of the salt bridge extends to the inside of the first reaction cavity; and the other end of the salt bridge extends to the inside of the second reaction cavity. Through the manner, the sodium ion sensor disclosed by the invention can be miniaturized, so that the sodium ion sensor is convenient to carry and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to a sodium ion sensor and a manufacturing method thereof. Background technique [0002] The detection of sodium ions has a wide range of applications in many fields such as medicine, biochemistry, pharmacy, chemical industry, environmental protection and food, especially the detection of sodium ions in human body fluids has important medical and clinical significance. Sodium in the human body is an important cation in extracellular fluid, accounting for more than 90% of the total cations in extracellular fluid, and plays an important role in maintaining stable extracellular fluid volume and osmotic pressure. Maintaining a certain ratio of various ions in body fluids is a necessary guarantee for maintaining the normal stress function of nerves and muscles, and a normal concentration of sodium ions is an important factor to ensure their functions. [0003] The tradit...

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Problems solved by technology

[0006] The internal reference solution of traditional ion-selective electrodes generally uses electrolyte solutions, which can only work at lower temperatures and pressures. The manufacturing cost is high, and the volume of the sodium ion-selective electrode is large, resulting in slow response and difficult The miniaturization of electrodes is not easy to carry, and it cannot meet the needs of surgery, emergency treatment, field rescue, etc., nor can it adapt to the trend of family medicine and modern medical in vitro diagnostic equipment models.

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