Solution for eliminating nano electrochemical sensor passivation and method for eliminating passivation thereof

Abstract

The invention discloses a solution used for eliminating the passivation of a nanometer electrochemical sensor and a method for eliminating the passivation thereof. The original-position surface finishing, the dynamic protection and the passivation prevention of nanometer materials can be realized on the basis of the reversible absorption of water-solubility functional surface active substance on the surfaces of nanometer sensitive materials. Compared with the existing nanometer electrochemical sensor which realizes the passivation prevention on the basis of the covering protection from various expensive polymer materials, the invention uses a surfactant agent which is low in price and forms a dynamic unimolecule protection layer on the interface original position of a sensor sensitive layer of the solution, thereby the solution has the characteristics of simple use, low cost and easy property regulation and control of the protection layer, thus being beneficial for the dispersion of bulk substrates, such as biomacromolecule, and the like; in addition, the passivation prevention of various nanometer electrochemical sensors can be effectively realized, and the wide application prospect can be brought.

Description

technical field [0001] The invention relates to a solution for eliminating passivation of nanometer electrochemical sensors and a method for eliminating passivation thereof, which is suitable for eliminating passivation of electrochemical sensors constructed with nanometer materials as sensitive materials. Background technique [0002] Nanoparticles that make up nanomaterials will cause a rapid increase in the number of surface atoms and surface area when their diameter is reduced to the nanometer level. At the same time, because the number of atoms on the surface is large, the crystal field environment and binding energy of the surface atoms are different from those of the internal atoms, resulting in the lack of adjacent atoms around the surface atoms, many dangling bonds, unsaturated properties, and easy interaction with other atoms. Combined and stabilized, resulting in great chemical activity of the surface atoms. Therefore, electrochemical sensors constructed with nan...

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Problems solved by technology

However, precisely because of the high chemical activity and strong adsorption capacity of surface atoms on nanomaterials, they are easily combined with other inert atoms in practical use and are passivated, thus reducing the analytical performance of electrochemical sensors.

In order to overcome this problem, a polymer film is often covered outside the sensitive film of the electrochemical sensor to eliminate the irreversible adsorption and passivation of possible interfering substances on the sensitive layer of nanomaterials. This method can be used to a certain extent. Overcome the passivation problem of some electrochemical sensors, but the polymer protective materials used are often costly, and the types of polymer materials are limited

In addition, the polymer protective film is immobilized on the surface of the sensor, and its structure is difficult to control according to the needs. The prepared sensor is also difficult to achieve regeneration, and the response to biomacromolecules is not sensitive, etc., which limit its application under certain conditions. practical application of

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