▎ 摘　　要

NOVELTY - The method involves using 12M hydrochloric acid and lithium fluoride, selectively etching the metal aluminum (Al) layer in Titanium Aluminum Carbide (Ti3AlC2), forming Titanium Carbide (Ti3C2Tx) nanosheet after ultrasonic to generate a few layer Ti3C2Tx and after freeze drying, using the improved Hummer method to peel the graphite into a few layers to be graphene, forming the oxidized graphene, dispersing the freeze-dried Ti3C2Tx and oxidized graphene nano sheet into water, transferring the dispersion liquid to agate mortar for grinding, so as to configure to print ink, directly extruding and printing the prepared printing ink by a 3D printer to obtain the Ti3C2Tx/GO electromagnetic shielding composite material with three-dimensional gradient structure, and controlling and oxidizing the three-dimensional frame under the nitrogen atmosphere to obtain high performance TiO2- Ti3C2Tx/rGO electromagnetic shielding composite material. USE - The method is useful for generating titanium dioxide-titanium carbide heterostructure enhanced electromagnetic shielding efficiency by thermal annealing process. ADVANTAGE - The method: enhances conductivity loss and conduction loss of composite material; performs thermal annealing control oxidation treatment to composite material under the nitrogen atmosphere; enhances dipole polarization between composite material and incident electromagnetic wave; optimizes dielectric loss and impedance matching with free space, so as to obtain electromagnetic shielding composite material with multiple loss mechanism synergistic effect; and has wide market prospect.