High-stability self-linking MXene nanosheet, and preparation method and application thereof

Abstract

The invention provides a high-stability self-linking MXene nanosheet, and a preparation method and application thereof, and particularly provides a surface-modified MXene nanosheet. The MXene nanosheet is provided with Na ions and a sulfonic acid intercalation layer, and meanwhile, the surface of the MXene nanosheet is also provided with a polydopamine layer and a polyethylene dioxythiophene layer; the polydopamine layer and the polyethylene dioxythiophene layer are arranged in sequence; and specifically, firstly, a polydopamine layer is polymerized on the surface of an MXene nanosheet with Na ions and a sulfonic acid intercalation layer, and then a polyethylene dioxythiophene layer is polymerized in situ. Various modifications of the MXene nanosheet interact, and various properties such as physical and chemical stability, film-forming ability and biocompatibility of the MXene nanosheet in a living body are enhanced, so that the MXene nanosheet can be used as an electrode modification material, a peripheral nerve cell repair material, a wire of a neural electrode, a site of a central nerve electrode and the like.

Description

technical field [0001] The invention belongs to the field of biological materials, and in particular relates to a highly stable self-connected MXene nanosheet and its preparation method and application. Background technique [0002] The singular properties of graphene mechanically exfoliated from graphite demonstrate that electrical, optical, mechanical, and electrochemical properties can be profoundly tuned by reducing the thickness of a three-dimensional material to a two-dimensional atomically thin sheet, a breakthrough discovery that greatly advances the understanding of Research on the synthesis and characterization of high-quality two-dimensional materials other than graphene. MXenes, a new class of two-dimensional materials, have attracted more and more research attention in many aspects, standing at the forefront of the two-dimensional materials community. MXene material is a kind of layered two-dimensional carbon / nitride, and its parent phase material MAX phase (Mn...

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Problems solved by technology

However, in this patent, how to prepare conductive polymers is not disclosed. Polyethylene dioxythiophene is usually obtained by three methods, chemical polymerization, electropolymerization and photopolymerization

Among them, electropolymerization and photopolymerization cannot realize the surface modification of nanosheets, and can only be used for coating, coating or volume forming, etc.

However, in situ polymerization of ethylenedioxythiophene on MXene is difficult, because the conventional chemical polymerization of ethylenedioxythiophene requires the use of oxidative catalysts including ferric ions, and because MXene has strong reducibility, so will destroy MXene

[0006] Publication No. CN 109096754 A patent discloses a kind of MXene-polydopamine composite material, which obtains in-situ polymerized polydopamine by reacting MXene and dopamine, However, due to the direct polymerization on the surface of MXene, the polymerization activity is weak and the polymerization time is long, which takes 24 hours.

In addition, the polymerized dopamine is placed on the surface of MXene and is in direct contact with the outside world. It is easily affected by an overly strong oxidative environment and causes structural damage, which partially loses the effect of maintaining the stability of the polydopamine layer that can increase stability.

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