阅读说明：本技术 石墨烯导电结构及其制备方法、自修复方法 (Graphene conductive structure, preparation method thereof and self-repairing method thereof ) 是由 李红变 史济东 刘恺然 李新国 李文波 于 2018-12-04 设计创作，主要内容包括：一种具有自修复功能的石墨烯导电结构及其制备方法、具有自修复功能的石墨烯导电结构的自修复方法。该具有自修复功能的石墨烯导电结构包括石墨烯纳米片和纳米纤维素。该具有自修复功能的石墨烯导电结构不仅机械强度高,同时导电性能优异,断裂之后在有水的环境中可以自恢复形貌和导电性,具有较好的柔性,其可广泛用于高性能纤维、生物传感器、复合纤维材料和表面吸附材料等领域。(A graphene conductive structure with a self-repairing function, a preparation method thereof and a self-repairing method of the graphene conductive structure with the self-repairing function are provided. The graphene conductive structure with the self-repairing function comprises a graphene nanosheet and nanocellulose. The graphene conductive structure with the self-repairing function is high in mechanical strength, excellent in conductivity, capable of self-recovering in appearance and conductivity in a water environment after fracture, good in flexibility and capable of being widely applied to the fields of high-performance fibers, biosensors, composite fiber materials, surface adsorption materials and the like.)

A graphene conductive structure with a self-repairing function comprises a graphene nanosheet and nanocellulose.

The graphene conductive structure with self-healing functionality according to claim 1, wherein the nanocellulose is adsorbed on the surface of the graphene nanoplatelets.

The graphene conductive structure with a self-repairing function according to claim 1, wherein the graphene nanoplatelets and the nanocellulose are homogeneously mixed.

The graphene conductive structure having a self-repairing function according to claim 1 or 3, wherein a mass ratio of the graphene nanoplatelets to the nanocellulose is 1: 1.

The graphene conductive structure with self-repairing function according to any one of claims 1 to 4, wherein the graphene nanoplatelets have a thickness of 2nm to 3nm and a width of 20nm to 5 μm.

The self-repairing graphene conductive structure according to claim 5, wherein the sheets of the graphene nanoplatelets are staggered, and the whole self-repairing graphene conductive structure forms a continuous sheet without a fracture in the middle.

The graphene conductive structure with the self-repairing function according to any one of claims 1 to 6, wherein the nanocellulose is a linear structure, the linear structure has a diameter of 5nm to 22nm and a length of 2 μm to 50 μm.

The graphene conductive structure having a self-repairing function according to any one of claims 1 to 7, wherein the nanocellulose is a nanostructure formed of linear macromolecules having D-glucopyranose rings as units, linked to each other in a C1 chair conformation by β -1, 4-glycosidic bonds.

The graphene conductive structure with self-repairing function according to any one of claims 1-8, wherein the thickness of the graphene conductive structure with self-repairing function is 500nm-50 μm.

The graphene conductive structure with self-repairing function according to any one of claims 1 to 9, wherein the graphene conductive structure with self-repairing function self-repairs in an environment with water.

The graphene conductive structure with self-repairing function according to any one of claims 1 to 10, wherein the self-repairing of the graphene conductive structure with self-repairing function includes self-repairing of conductive performance and morphology.

The graphene conductive structure with self-repairing function as claimed in any one of claims 1 to 11, wherein the graphene conductive structure with self-repairing function has a linear density of 0.7 to 1.5tex, a tensile strength of 170-450MPa, an elongation at break of 3-12%, and an electrical conductivity of 320-850S/m.

A preparation method of a graphene conductive structure with a self-repairing function comprises the following steps:

mixing graphene nanoplatelets and nanocellulose to form a first solution;

and forming a film on the first solution to form the graphene conductive structure with the self-repairing function.

The preparation method according to claim 13, further comprising providing a substrate base plate, wherein the film formation of the first solution to form the graphene conductive structure with the self-repairing function comprises the steps of forming the first solution on the substrate base plate by using a spraying method, and then drying at room temperature.

The preparation method according to claim 13, further comprising providing a substrate base plate, and transferring the graphene conductive structure with the self-repairing function to the substrate base plate.

The production method according to any one of claims 13 to 15, wherein the graphene nanoplatelets are formed by a method of electrochemically exfoliating graphite or a method of reducing graphene oxide nanoplatelets.

The production method according to any one of claims 13 to 15, wherein the nanocellulose is formed from wood pulp after oxidation by 2,2,6, 6-tetramethylpiperidine oxide (TEMPO).

The production method according to any one of claims 13 to 17, wherein the mass ratio of the graphene nanoplatelets to the nanocellulose is 1: 1.

The method of preparing of any one of claims 13-18, wherein mixing graphene nanoplatelets and nanocellulose to form a first solution comprises: performing ultrasonic treatment after mixing the graphene nanoplatelets and the nanocellulose.

The method of preparing as defined in claim 19, wherein mixing graphene nanoplatelets and nanocellulose to form a first solution comprises: adding 1-20 mL of the 1-30% by mass nanocellulose dispersion into 1-20 mL of 1-30% by mass graphene nanosheet dispersion, and ultrasonically mixing for 10-20 minutes.

The production method according to claim 13, wherein after the first solution is formed, the first solution is dried in a petri dish at room temperature to form a film or is dried after filtration to form a film.

The method according to claim 21, wherein the first solution is dried to form a film at room temperature when the volume of the first solution is 1 to 5 ml.

The method of claim 22, wherein the first solution is filtered and dried to form a membrane when the volume of the first solution is greater than 5 mL.

The production method according to claim 15, wherein the base substrate includes a rigid substrate or a flexible substrate.

A self-repairing method of the graphene conductive structure with self-repairing function as claimed in any one of claims 1-12, comprising:

and putting the graphene conductive structure with the self-repairing function with the deteriorated conductivity into an environment with water to realize the recovery of the conductivity of the graphene conductive structure with the self-repairing function.

The self-healing process of claim 25, wherein the aqueous environment is an environment having a humidity of 40% to 80%.

The self-repairing method according to claim 25 or 26, wherein the graphene conductive structure with the self-repairing function, in which the conductivity is deteriorated, is put in an environment with water for less than 1 minute.