Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 3, Pages 746-750Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201809730
Keywords
graphdiyne; carbon materials; liquid-phase exfoliation; non-covalent adsorption; surface chemistry
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Funding
- National Natural Science Foundation of China [21790390, 21790391, 21435007, 21621062, 21790053, 21790050]
- National Basic Research Program of China [2016YFA0200104]
- Chinese Academy of Sciences [QYZDJ-SSW-SLH030]
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The two-dimensional carbon material graphdiyne (GDY) holds great promise as a semiconductor and porous material, however, exfoliation of bulk GDY into single- or few-layered GDY in the aqueous phase remains a challenge. We report an efficient method for the damage-free exfoliation of bulk GDY into single- or few-layered GDY with high yield in an aqueous solution of inorganic salts (e.g., Li2SiF6). This was confirmed by spherical-aberration-corrected scanning transmission electron microscopy, scanning/transmission electron microscopy, atomic force microscopy, Fourier transform infrared/Raman spectroscopy, X-ray photoelectron spectroscopy. The method gives high exfoliation efficiency (75 wt %) without creating additional structural defects or oxides in the exfoliated GDY. Theoretical calculations suggest that non-covalent adsorption of the anion, diffusion of the cation, and subsequent repulsive forces between adjacent flakes are the main driving force for the efficient exfoliation.
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