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首页> 外文期刊>Nanotechnology >Large scale production of highly-qualified graphene by ultrasonic exfoliation of expanded graphite under the promotion of (NH_4) _2CO_3 decomposition
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Large scale production of highly-qualified graphene by ultrasonic exfoliation of expanded graphite under the promotion of (NH_4) _2CO_3 decomposition

机译：在（NH_4）_2CO_3分解促进下通过超声剥落膨胀石墨大规模生产高品质石墨烯

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Highly-qualified graphene was prepared by the ultrasonic exfoliation of commercial expanded graphite (EG) under the promotion of (NH_4) _2CO_3 decomposition. The yield of graphene from the first exfoliation is 7 wt%, and it can be increased to more than 65 wt% by repeated exfoliations. Atomic force microscopy, x-ray photoelectron spectroscopy and Raman analysis show that the as-prepared graphene only has a few defects or oxides, and more than 95% of the graphene flakes have a thickness of ～1 nm. The electrochemical performance of the as-prepared graphene is comparable to reduced graphene oxide in the determination of dopamine (DA) from the mixed solution of ascorbic acid, uric acid and DA. These results show that the decomposition of (NH_4)_2CO_3 molecules in the EG layers under ultrasonication promotes the exfoliation of graphite and provides a low-priced route for large scale production of highly-quality graphene.
机译：在（NH_4）_2CO_3分解的促进下，通过对商用膨胀石墨（EG）进行超声剥离，制备出高品质的石墨烯。第一次剥离产生的石墨烯产率为7 wt％，通过重复剥离可以将其提高到65 wt％以上。原子力显微镜，X射线光电子能谱和拉曼分析表明，所制备的石墨烯仅具有少量缺陷或氧化物，并且超过95％的石墨烯薄片的厚度约为1 nm。从抗坏血酸，尿酸和DA的混合溶液中测定多巴胺（DA）时，所制备的石墨烯的电化学性能与还原的氧化石墨烯相当。这些结果表明，在超声作用下，EG层中的（NH_4）_2CO_3分子的分解促进了石墨的剥离，并为大规模生产高质量的石墨烯提供了廉价的途径。

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