▎ 摘　　要

NOVELTY - Preparing two-dimensional nano material by physical vacuum energy comprises e.g. (i) preparing a buffer solution of a corresponding pH value according to the type of the metal, adding 2.5 mg/l auxiliary agent, stirring at 120 revolutions/minute (rpm) for 5-12 minutes, simultaneously performing ultrasonic treatment with each ultrasonic treatment time of 65 seconds at an interval of 45 seconds to obtain a homogeneous solution, (ii) taking 100 ml each of 8-23 mg/l graphene oxide solution and 23-67 g/l metal salt solution, firstly adding one-third of the graphene oxide solution and two-fifth of the metal salt solution to 300 ml of the homogenous solution, adding 5.5 mg/l N-vinyl pyrrolidone, uniformly stirring, then adding one-third of the graphene oxide solution and one-fifth of the metal salt solution, stirring, keeping for 3-5 minutes, and adding the remaining one-third of the graphene oxide solution and two-fifths of the metal salt solution. USE - The method is useful for preparing two-dimensional nano material by physical vacuum. ADVANTAGE - The method: is simple and easy to access the raw materials; has high-mass production; is environmentally friendly; and improves the bending resistance of the nano material. DETAILED DESCRIPTION - Preparing two-dimensional nano material by physical vacuum energy comprising (i) preparing a buffer solution of corresponding pH value according to the type of the metal, adding 2.5 mg/l auxiliary agent, stirring at 120 rpm for 5-12 minutes, simultaneously performing ultrasonic treatment with each ultrasonic treatment time of 65 seconds at an interval of 45 seconds to obtain a homogeneous solution, (ii) taking 100 ml each of 8-23 mg/l graphene oxide solution and 23-67 g/l metal salt solution, firstly adding one-third of the graphene oxide solution and two-fifth of the metal salt solution to 300 ml homogenous solution, adding 5.5 mg/l N-vinyl pyrrolidone, uniformly stirring, then adding one-third of the graphene oxide solution and one-fifth of the metal salt solution, stirring, keeping for 3-5 minutes, adding the remaining one-third of the graphene oxide solution and two-fifths of the metal salt solution, adding 7.8 mg/l hexamethyldisilazane, uniformly stirring to obtain a mixed solution and performing ultrasonic treatment once for every 1-2 minutes, (iii) heating the mixed solution at 22-27 degrees C for 1-2 minutes, then heating at 37-83 degrees C, continuously stirring for 8-15 minutes, cooling to room temperature, centrifuging at 2700-4200 rpm for 4-7 minutes, and continuously washing for 3 times at an interval of 3-5 minutes to obtain a precipitate, (iv) transferring the precipitate into a vacuum freeze-drying device, vibrating and drying for 14-18 hours to obtain a precursor, and (v) transferring the precursor into a calcining furnace, calcining at 480-590 degrees C for 1-2 hours under the protection of nitrogen-oxygen atmosphere, keeping at a constant temperature for 20-35 minutes, then calcining at 560-640 degrees C for 0.5-1 hours in nitrogen atmosphere, keeping at constant temperature, cooling at rate of 31 degrees C/minute, performing magnetic stirring, then cooling to room temperature and ball milling.