All-solid-state ion selective electrode modified based on single-walled carbon nanotube composite porous pine cone biochar and preparation method

Abstract

The invention provides an all-solid-state ion selective electrode modified based on single-walled carbon nanotube composite porous pine cone biochar and a preparation method. The all-solid-state ion selective electrode comprises a conductive substrate, a porous pine cone biochar solid transduction layer modified on the outer surface of the conductive substrate, a single-wall carbon nanotube layer modified on the outer surface of the porous pine cone biochar solid transduction layer, and an ion selective membrane layer modified on the outer surface of the single-wall carbon nanotube layer; the thickness of the porous pine cone biochar solid transduction layer is 0.05 to 0.1 mm; the thickness of the single-walled carbon nanotube layer is 0.05 to 0.1 mm; and the thickness of the ion selective membrane layer is 0.05 to 0.15 mm. The all-solid-state ion selective electrode has better ion-electron conversion efficiency, conductivity and capacitive performance, and is good in hydrophobicity and potential stability; the sensitivity, the stability and the repeatability of ion detection can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis, and in particular relates to an all-solid-state ion-selective electrode modified based on single-walled carbon nanotube composite porous pinecone biochar and a preparation method. Background technique [0002] Ion-selective electrodes are an important class of electrochemical sensors. The detection principle is based on the relationship between the potential response of the sensitive membrane and the activity of the substance to be measured according to the Nernst equation. Compared with other sensors, ion-selective electrodes have attracted much attention due to their simple principle, easy preparation, convenient operation, high selectivity, rapid response, low price, non-destructive testing, and wide application. And biomedical analysis and other fields have been widely used. Compared with the traditional glass ion selective electrode with inner filling liquid, the all-solid ...

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Problems solved by technology

[0003] The all-solid-state ion-selective electrode is mainly composed of three parts: a conductive substrate, a solid transduction layer, and an ion-selective polymer membrane. Among them, the solid transduction layer plays a major role in electron transfer. There are differences in the application of the transduction layer. At present, the commonly used materials for the transduction layer include conductive polymers, new carbon nanomaterials and metal nanomaterials. Conductive polymer materials are the earliest materials used in the electrode transduction layer, but due to their oxidation The reduction capacitance and conductivity are low, so it has not been widely used; carbon nanomaterials are easy to synthesize, and have good electrochemical performance, physical properties and chemical stability; metal nanomaterials have high conductivity and large specific surface area, and they are excellent. Synthesis of precious metal materials such as gold and silver, so the cost is high and the scope of application is relatively limited

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