▎ 摘　　要

NOVELTY - A heterogeneous film is a three-layer structure film with a microscopic heterointerface formed by interlaced stacking of graphene oxide layers and titanium carbide MXene layers, where the top film and the bottom film are both The graphene oxide layer and the titanium carbide MXene layer are in the middle of the top and bottom films. USE - The heterogeneous film is used in electromagnetic shielding (claimed). ADVANTAGE - The heterogeneous film has good electromagnetic shielding performance and performance retention permanently. The method is simple and easy, it does not use toxic and harmful solvent, it will not cause secondary pollution, and it can be used for mass industrial production. DETAILED DESCRIPTION - A heterogeneous film is a three-layer structure film with a microscopic heterointerface formed by interlaced stacking of graphene oxide layers and titanium carbide MXene (Ti3C2TXMXene) layers, where the top film and the bottom film are both The graphene oxide layer and the Ti3C2TXMXene layer are in the middle of the top and bottom films. An INDEPENDENT CLAIM is included for preparation of the heterogeneous film comprising vacuum filtering graphene oxide aqueous solution to form a bottom film; pouring titanium carbide MXene dispersion on the formed bottom film and vacuum filtering to form a functional film; vacuum filtering to form a top film; anddrying the heterogeneous film in which the graphene oxide layer and the titanium carbide MXene layer are interlaced