▎ 摘　　要

NOVELTY - Double-needle head three-dimensional printing preparation method of directional electromagnetic shielding composite material, involves using hydrochloric acid and lithium fluoride to etch metal aluminum layer in titanium aluminum carbide, forming two-dimensional titanium carbide nanosheets, exfoliating graphite into few-sheet graphene oxide and forming graphene oxide nanosheets, dispersing freeze-dried two-dimensional titanium carbide and graphene oxide in water to form dispersion liquid, grinding the dispersion liquid, so as to configure graphene oxide and MXene (GM) printing ink, formulating iron(II,III) oxide and graphene oxide into iron(II,III) oxide and graphene oxide (GF) printing ink, extruding and printing the printing ink through three-dimensional printer to obtain GF/GM electrical three-dimensional frame, and oxidizing three-dimensional frame to obtain reduced graphene oxide and iron(II,III) oxide/reduced graphene oxide and MXene (rGF/rGM) three-dimensional frame. USE - Double-needle head three-dimensional printing preparation method of directional electromagnetic shielding composite material with asymmetric structure. ADVANTAGE - The composite material shows that the asymmetric structure composed of porous magnetic layer and dense deep conductive layer can produce special process of weak reflection-absorption and strong reflection-reabsorption for incident electromagnetic waves. DETAILED DESCRIPTION - Double-needle head three-dimensional printing preparation method of directional electromagnetic shielding composite material with asymmetric structure, involves using 12 M hydrochloric acid and lithium fluoride to selectively etch metal aluminum layer in titanium aluminum carbide, generating few layers of two-dimensional titanium carbide after ultrasonication and forming two-dimensional titanium carbide nanosheets after freeze-drying, using improved Hummer method, exfoliating graphite into few-sheet graphene oxide and forming graphene oxide nanosheets after freeze-drying, dispersing freeze-dried two-dimensional titanium carbide and graphene oxide in water according to preset ratio to form a dispersion liquid and ultrasonically treating for 15 minutes, transferring the dispersion liquid to agate mortar for grinding, so as to configure graphene oxide and MXene (GM) printing ink, and formulating iron(II,III) oxide and graphene oxide into iron(II,III) oxide and graphene oxide (GF) printing ink according to preset mass ratio, directly extruding and printing the printing ink through three-dimensional printer to obtain a GF/GM electrical three-dimensional frame with an asymmetric structure, oxidizing the three-dimensional frame under nitrogen atmosphere to obtain reduced graphene oxide and iron(II,III) oxide/reduced graphene oxide and MXene (rGF/rGM) three-dimensional frame with high electrical conductivity and magnetic permeability, and performing vacuum impregnation of the three-dimensional framework oxidized under nitrogen in polydimethylsiloxane (PDMS) to obtain rGF/rGM/PDMS composite material.