| 초록 |
Two-dimensional (2D) nanosheets obtained via exfoliation of layered materials have attracted great interest due to their unique properties and potential applications. Especially, exfoliation into nanosheets with lateral size of micrometers but atomically thin thickness requires sensitive ambient conditions and takes long process time caused by repeated operations such as ion intercalation and exchange. Thus, the development of efficient and simple exfoliation process has being highly demanded for the layered materials with strong interlayer force. Here, we present that muscovite which has severe layer charge deficiency and low cation exchange capacity can be successfully exfoliated into nanosheets with atomically thin thickness and micrometer-lateral size using an amphiphilic polymer in aqueous solution. Through solution-phase exfoliation, hydroxyl groups entirely existing on the both surfaces of the sides can be bonded with the hydrophilic groups of polymer molecules by the strong hydrophilic interactions without restricted sites. On the other hand, hydrophobic groups of them head toward the solvent. The FTIR and Raman results indicated that the adsorption of polymer molecules on the both full surfaces of the sides significantly weaken or even break the interlayer tightly stacked in the muscovite. As a result, it forms the full exfoliated nanosheets in lateral size of 5 um and thickness of 1.45 nm, as well as, preventing the aggregation of atomically thin nanosheets through steric hindrance effect. |
