▎ 摘　　要

NOVELTY - A graphene-supported ferroferric oxide nanocomposite material is prepared by preparing precursor by adding graphene and iron(III) nitrate nonahydrate or iron(III) chloride hexahydrate to ethyl alcohol according to mass ratio of 1:0.2-1, obtaining mixed solution A, adding 200 g sodium dodecylbenzenesulfonate or sodium dodecylsulfate to mixed solution A of graphene and iron source, placing in ultrasonic oscillator for 5-10 minutes, stirring for 1-2 hours at 30-80 degrees C, and obtaining mixed solution B. USE - Preparation of graphene-supported ferroferric oxide nanocomposite material for magnetic resonance contrast agent and lithium ion battery. ADVANTAGE - The method uniformly distributes ferroferric oxide on graphene and is stable and simple. DETAILED DESCRIPTION - A graphene-supported ferroferric oxide nanocomposite material is prepared by preparing precursor by adding graphene and iron(III) nitrate nonahydrate (Fe(NO)3.9H2O) or iron(III) chloride hexahydrate (FeCl3.6H2O) to ethyl alcohol according to mass ratio of 1:0.2-1, obtaining mixed solution A, adding 200 g sodium dodecylbenzenesulfonate or sodium dodecylsulfate to mixed solution A of graphene and iron source, placing in ultrasonic oscillator for 5-10 minutes, stirring for 1-2 hours at 30-80 degrees C, obtaining mixed solution B, adding 10-30 drops of sodium hydroxide (NaOH) solution or diluted ammonia water per minute to mixed solution B during stirring process, wherein 279 mg NaOH is added for each gram of Fe(NO)3.9H2O, 444 mg NaOH is added for each gram of FeCl3.6H2O, 0.289 ml ammonia water (0.9 g/ml) is used for each gram of Fe(NO)3.9H2O, and 0.432 ml ammonia water (0.9 g/ml) is used for each gram of FeCl3.6H2O, stirring for 0.5-1.5 hours, washing obtained black powder with deionized water, drying for 8-12 hours at 60-100 degrees C, and obtaining iron(III) hydroxide (Fe(OH)3)/graphene precursor powder, paving precursor powder in quartz boat, putting quartz boat in tube furnace, accessing argon with flow of 100-300 ml/minute for 5-30 minutes to exhaust all air, warming to 400-600 degrees C with heating rate of 7.5-10 degrees C/minute in protection of argon, calcining for 0.5-3 hours at constant temperature, continuing accessing argon, cooling tube furnace temperature to 200-400 degrees C with cooling rate of 7.5-10 degrees C/minute, decreasing argon flow to 80-120 ml/minute, accessing hydrogen or ammonia gas, restoring with argon and hydrogen or mixed gas of argon and ammonia gas, wherein volume flow ratio of argon and hydrogen or argon and ammonia gas is 0.85-0.95:0.05-0.15, restoring for 30-90 minutes, and obtaining graphene-supported ferroferric oxide nanocomposite material.