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首页> 外文期刊>Nanotechnology >Graphene reflux: improving the yield of liquid-exfoliated nanosheets through repeated separation techniques
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Graphene reflux: improving the yield of liquid-exfoliated nanosheets through repeated separation techniques

机译：石墨烯回流：通过重复的分离技术提高液体剥离纳米片的产率

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Scalable production of graphene through liquid-phase exfoliation has been plagued by low yields. Although several recent studies have attempted to improve graphene exfoliation technology, the problem of separating colloidal nanosheets from unexfoliated parent material has received far less attention. Here we demonstrate a scalable method for improving nanosheet yield through a facile washing process. By probing the sedimentation of liquid-phase exfoliated slurries of graphene nanosheets and parent material, we found that a portion of exfoliated graphene is entrapped in the sediment, but can be recovered by repeatedly washing the slurry of nanosheet and parent material with additional solvent. We found this process to significantly increase the overall yield of graphene (graphene/parent material) and recover a roughly constant proportion of graphene with each wash. The cumulative amount of graphene recovered is only a function of total solvent volume. Moreover, we found this technique to be applicable to other types of nanosheets such as boron nitride nanosheets.
机译：通过液相去角质的可伸缩生产石墨烯已被低产率困扰。虽然最近的几项研究试图改善石墨烯剥离技术，但分离胶体纳米液与未爆炸的母体材料的问题受到了不太关注。在这里，我们展示了一种可扩展的方法，用于通过容易洗涤过程提高纳米片产量。通过探测石墨烯纳米片和母体材料的液相剥离浆料的沉降，我们发现将剥落的石墨烯的一部分捕获在沉积物中，但可以通过用另外的溶剂反复清洗纳米片和母体材料的浆料来回收。我们发现该方法显着提高了石墨烯（石墨烯/母体材料）的总产率，并用每种洗涤回收大致恒定的石墨烯比例。回收的石墨烯的累积量仅是总溶剂体积的函数。此外，我们发现该技术适用于其他类型的纳米片，例如氮化硼纳米片。

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