▎ 摘　　要

NOVELTY - Preparing two-dimensional transition metal carbides, nitrides, and carbonitrides/reduced graphene oxide/tin oxide (MXene/rGO/SnO2) nanocomposite involves peeling MAX phase powder by chemical method to obtain MXene nanosheet, using de-ionized water as solvent for ultrasonic dispersing to obtain MXene nanosheet aqueous dispersion solution, adding graphene oxide and stannic chloride pentahydrate into deionized water, and stirring and mixing to obtain aqueous-dispersion solution. An ammonium fluoride and urea are added to obtain mixed solution, obtained MXene nanosheet aqueous dispersion solution is magnetically stirred and mixed, and mixed solution and sodium alginate aqueous dispersion solution are mixed to obtain mixed gel solution. The mixed gel solution is subjected to hydrothermal treatment, filtered and cooled, freeze-dried, freeze-dried product is heat-treated, and reduced under reducing gas/inert gas mixed gas atmosphere to obtain MXene/rGO/SnO2 nanocomposite material. USE - Method for preparing MXene/rGO/SnO2 nano composite material for use in the field of electromagnetic wave absorption (claimed), energy storage and conversion device, nano electronic device, flexible wearable and electromagnetic shielding field. ADVANTAGE - The method enables to provide MXene/rGO/SnO2 nano-composite material with high dielectric loss capability, low density, high conductivity, high specific surface area, high conductivity, and high electromagnetic wave absorption performance. The method has simple technique, strong repeatability, and is easy to control. The obtained composite material has light weight, and enhances the electromagnetic wave-absorbing performance of the material.