▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene/carbon nano tube/polydimethylsiloxane composite material, involves (a) subjecting graphene oxide solution and a multi-walled carbon nano tube to magnetic stirrer and ultrasonic treatment to prepare a pre-foaming solution, (b) adding ascorbic acid and octyl decyl glucoside into the pre-foaming liquid, fully and magnetically stirring to obtain three-dimensional graphene foam, and freezing and drying to obtain aerogel, and (c) putting the aerogel into an impregnation liquid to obtain the three-dimensional graphene/carbon nano tube/polydimethylsiloxane composite material, where the impregnation liquid is prepared by mixing and stirring n-hexane, polydimethylsiloxane and polydimethylsiloxane curing agent. USE - Method for preparing three-dimensional graphene/carbon nano tube/polydimethylsiloxane composite material with efficient sound absorption performance. ADVANTAGE - The three-dimensional graphene/carbon nanotube/polydimethylsiloxane composite material realizes good sound absorption effect in a sound wave frequency range of 200-6400 Hz, and particularly realize high-efficiency sound absorption in a medium-high frequency range of 2000-6400 Hz, and also has good hydrophobic property, and the water contact angle is 118.42-137.84 degrees. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a three-dimensional graphene/carbon nanotube/polydimethylsiloxane composite material, prepared by the method.