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CN-122011808-A - Alkoxy covalent modified MXene and preparation method and application thereof

CN122011808ACN 122011808 ACN122011808 ACN 122011808ACN-122011808-A

Abstract

The invention discloses an alkoxy covalent modified MXene, a preparation method and application thereof, and relates to the technical field of MXene materials, wherein the preparation method comprises the following steps of centrifuging an aqueous dispersion liquid of a single-layer MXene, washing by using an organic solvent, and dispersing in the organic solvent to obtain an MXene organic dispersion liquid; dissolving sodium alkoxide in toluene, adding MXene organic dispersion, stirring in inert gas atmosphere for reaction, centrifuging, and washing with hydrochloric acid and ethanol. The invention also discloses the modified MXene covalently modified by the alkoxy, which is prepared by the preparation method, and the application of the modified MXene in preparation of the electrofluid printing ink. The invention realizes amphipathy of MXene through simple one-step covalent surface modification, realizes stable dispersion in various polar and nonpolar organic solvents, maintains high conductivity to the maximum extent, and improves the applicability of the MXene in high-precision electrofluid printing.

Inventors

  • DENG WEILI
  • ZHANG YINGYU
  • YANG WEIQING
  • TONG YAJIE
  • WANG SHENGLONG

Assignees

  • 西南交通大学

Dates

Publication Date
20260512
Application Date
20251223

Claims (10)

  1. 1. A method for preparing an alkoxy covalent modified MXene, which is characterized by comprising the following steps: (1) Centrifuging the water dispersion liquid of the single-layer MXene, washing by using an organic solvent, and dispersing in the organic solvent again to obtain an MXene organic dispersion liquid; (2) Dissolving sodium alkoxide in toluene, adding the MXene organic dispersion liquid obtained in the step (1), stirring and reacting in an inert gas atmosphere, centrifuging after the reaction is finished, and washing by using hydrochloric acid and ethanol to obtain the modified MXene with the alkoxy covalently modified.
  2. 2. The method for producing an alkoxy-covalently modified MXene according to claim 1, wherein in step (1) the organic solvent is dimethyl sulfoxide or N, N-dimethylformamide.
  3. 3. The method for producing an alkoxy-covalently modified MXene according to claim 1, wherein in step (1), the concentration of the MXene organic dispersion is 1-10 mg/mL.
  4. 4. The method for preparing an alkoxy-covalently modified MXene according to claim 1, wherein in step (2) the sodium alkoxide is sodium ethoxide or sodium phenoxide.
  5. 5. The method for preparing an alkoxy-covalently modified MXene according to claim 1, wherein in the step (2), the mass-volume ratio of the sodium alkoxide to the toluene is 2-20 mg/1 mL.
  6. 6. The method for producing an alkoxy-covalently modified MXene according to claim 1, characterized in that in step (2), the amount of the sodium alkoxide is 10 to 100% by mass of the MXene in the MXene organic dispersion.
  7. 7. The method for producing an alkoxy-covalently modified MXene according to claim 1, wherein in the step (2), the reaction is carried out at 30-50 ℃ with stirring for 3-24 h.
  8. 8. The modified MXene covalently modified by an alkoxy group of the method for preparing the modified MXene covalently modified by an alkoxy group of any one of claims 1-7.
  9. 9. Use of an alkoxy covalently modified MXene according to claim 8 for the preparation of an electrofluidic printing ink.
  10. 10. A highly conductive ink suitable for use in electrofluidic printing, prepared from the alkoxy-covalently modified MXene of claim 8.

Description

Alkoxy covalent modified MXene and preparation method and application thereof Technical Field The invention relates to the technical field of MXene materials, in particular to an alkoxy covalent modified MXene, and a preparation method and application thereof. Background MXnes, an emerging class of two-dimensional transition metal carbides, nitrides or carbonitrides, has been found since 2011 to be of great interest because of its high metal conductivity, good mechanical strength, unique optical and thermal properties, and has demonstrated great potential applications in the fields of energy storage, electromagnetic interference shielding, sensing, and transparent conductive films. The rich hydrophilic end groups on the surface of the MXene can ensure that the MXene can be stably dispersed in an aqueous solution, and can be formed into a film by solution processing technologies such as spray coating, spin coating, knife coating and the like. However, the inherent hydrophilicity of MXene also presents two significant challenges. Firstly, MXene has poor chemical stability, and when it is dispersed in an aqueous solution or exposed to humid air, oxidative degradation is extremely likely to occur, resulting in rapid decay of its excellent electrical conductivity and other physicochemical properties, greatly shortening the lifetime of the device. Second, its strongly hydrophilic surface is poorly compatible with most organic solvents, especially non-polar or weakly polar solvents, and is difficult to disperse stably therein. This feature severely limits the use of MXene in numerous industrial application scenarios. In many electronic device manufacturing processes, particularly when using electrofluidic printing techniques, there is a particular requirement for ink solvents that generally require the use of organic solvents (e.g., ethanol, toluene, etc.) that have a polarity but a relatively low surface tension to ensure that a stable taylor cone is formed and fine ejection is achieved under the influence of an electric field. Water is generally unsuitable as a solvent for electrofluidic printing inks because of its high surface tension, high boiling point, and susceptibility to electrode shorting. Because of the instability of perovskite in polar solvents, it is necessary to use a nonpolar solvent such as toluene. Also, in the synthesis of general purpose polymer (e.g., polyurethane, polyimide) composites for flexible electronics, electromagnetic shielding and energy storage systems, fillers are needed that are well compatible with these polymer solvents, which are mostly non-polar. Therefore, developing an MXene material that can be stably dispersed in a variety of organic solvents, including nonpolar solvents, while maintaining its intrinsic high conductivity has become a key to driving its practical application, particularly in electrofluidic printing technology. In order to improve the dispersibility of MXene in organic solvents, researchers have attempted to surface modify it by grafting organic ligands having hydrophobic segments. For example, reported modifiers include polyacrylonitrile fibers, alkyl phosphonic acids, polycarboxylic ether ethers, bis (hydrogenated tallow) benzyl methyl ammonium chloride, and the like. Although these modification strategies improve the dispersibility and oxidation resistance of MXene in organic solvents to some extent, long-chain or bulky organic molecules are typically incorporated. These molecules can impede electron transport between the MXene platelets and significantly increase the platelet spacing, resulting in a dramatic decrease in conductivity of the modified MXene, making it difficult to apply to applications where conductivity is desired, such as printed wires, coils, electrodes, and the like. As an emerging micro-nano scale patterning manufacturing technology, electrofluidic printing can accurately control deposition of ink drops through an electric field, and high-resolution patterns far exceeding the precision of traditional inkjet printing are realized. However, this technology places extremely high demands on the performance of inks, which require excellent dispersion stability and proper rheological properties in specific organic solvents to ensure smooth and unblocking of the printing process, and at the same time, the printed patterns must have high conductivity to be directly used in functional electronic devices. None of the existing MXene materials can meet these demanding requirements at the same time. Therefore, developing an MXene ink that is widely compatible with organic solvents, maintains high conductivity, and is suitable for use in electrofluidic printing is a technical challenge to be solved in the art. Disclosure of Invention In order to solve the technical problems, the invention aims to provide an alkoxy covalent modified MXene, a preparation method and application thereof, the invention adopts a simple one-step method to covalently modi