All-solid-state nano-probe for scanning electrochemical cell microscope, preparation method and application of all-solid-state nano-probe

Abstract

The invention provides an all-solid-state nanoprobe as well as a preparation method and application thereof. The all-solid-state nanoprobe comprises a glass tube and a solid polymer, wherein the solid polymer is filled in a glass tube body; the solid polymer is obtained by free radical polymerization of monomers and a photoinitiator, and the monomers comprise acrylamide, hydroxyethyl acrylate and polyethylene glycol diacrylate. The new all-solid-state nanoprobe can solve the contradiction that high electrochemical resolution and high spatial resolution are difficult to obtain at the same time. Compared with a liquid droplet, the solid small ball suspended at the needle tip has a more stable boundary dimension and also has electrochemical performance similar to that of the droplet. Meanwhile, the resolution ratio of the scanning electrochemical cell microscope is successfully improved.

Description

technical field [0001] The present application relates to the field of electrochemical detection, in particular to the field of an all-solid-state nanoprobe, its preparation method and its application. Background technique [0002] Graphene has attracted extensive attention of researchers because of its excellent electrical and mechanical properties since its appearance. In recent years, magic-angle graphene has become a major research hotspot because of its unique physical properties and its unlimited potential in the field of superconductivity. The existing graphene preparation method most likely to realize practical application is CVD (vapor phase deposition method). Using this method, researchers can prepare large-size, high-quality graphene. This is fully able to meet the application requirements, but the graphene grown on the surface of the metal substrate often needs to be transferred to other substrates in the actual application process. For example, in a commonly ...

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Problems solved by technology

[0004] However, relying on liquid droplets to realize the construction of electrochemical cells will bring some problems

First, the droplet is not absolutely stable: the piezoelectric ceramic is not absolutely uniform in the process of moving up, down, left, and right. At the moment of starting and stopping, the piezoelectric ceramic will have a large acceleration, which will cause the droplet to move. The shape and size change greatly, and this change is happening at the moment when the droplet contacts the sample, so it will cause a large error in the shape recorded by SECCM

Second, the droplet is easily affected by the humidity of the environment: Although the solution inside the probe will continuously supply the droplet to balance its volatilization into the environment, when the droplet size is small enough and the environment is dry enough, the volatilization of water It is still easy to let the salt precipitate out on the tip of the probe, which will make subsequent scans impossible

Third, when the droplet is in contact with the sample, the difference in the hydrophilicity and hydrophobicity of the sample surface will also lead to changes in the size of the electrochemical cell. Although researchers mostly construct hydrophobic needle tips to maintain the stability of the droplet size after the circuit is connected, but We still cannot ignore the impact of this on electrochemical characterization

Fourth, when the droplet contacts the sample and then leaves, it will inevitably leave traces on the surface of the sample, which leads to a certain distance between two adjacent scanning points, otherwise once the next scanning point Droplet contact with the droplet trace of the previous scanning point will cause the droplet being scanned to collapse, which will have a great impact on the scanning test results

However, due to differences in characterization environments and differences in sample processing procedures, it is difficult to co-localize between different techniques. At the same time, due to the complicated sample preparation and processing procedures, coupled with the limitations of operating time and vacuum degree, it will lead to samples showing Due to the changes in morphology and electrochemical properties, the good opportunity of observation is missed, which further makes it difficult for us to obtain in situ, high electrochemical resolution and high spatial resolution information at the same time.

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