A mixed-solvent strategy for facile and green preparation of graphene by liquid-phase exfoliation of graphite
Source abstract
Abstract
A versatile and scalable mixed-solvent strategy, by which two mediocre solvents could be combined into good solvents for exfoliating graphite, is demonstrated for facile and green preparation of graphene by liquid-phase exfoliation of graphite. Mild sonication of crystal graphite powder in a mixture of water and alcohol could yield graphene nanosheets, which formed a highly stable suspension in the mixed solvents. The graphene yield was estimated as *10 wt%. The optimum mass fraction of ethanol in water-ethanol mixtures and isopropanol in water- isopropanol mixtures was experimentally determined as *40 and *55 % respectively, which could be roughly predicted by the theory of Hansen solubility parameters. Statistics based on atomic force micro- scopic analysis show that up to*86 % of the prepared nanosheets were less than 10-layer thick with a monolayer fraction of *8 %. High resolution trans- mission electron microscopy, infrared spectroscopy, X-ray diffraction, and Raman spectrum analysis of the vacuum-filtered films suggest the graphene sheets to be largely free of defects and oxides. The proposed mixed-solvent strategy here extends the scope for liquid-phase processing graphene and gives research- ers great freedom in designing ideal solvent systems for specific applications.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Graphene research and applications · Advancements in Battery Materials · Chemical and Physical Properties of Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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