Intercalation and delamination of layered carbides and carbonitrides.

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Nature communications, ISSN: 2041-1723, Vol: 4, Issue: 1, Page: 1716

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Mashtalir, Olha; Naguib, Michael; Mochalin, Vadym; Dall'Agnese, Yohan; Heon, Min; Barsoum, Michel W.; Gogotsi, Yury G.
Springer Nature; Nature Publishing Group; Nature Research
Chemistry; Biochemistry, Genetics and Molecular Biology; Physics and Astronomy
article description
Intercalation and delamination of two-dimensional solids in many cases is a requisite step for exploiting their unique properties. Herein we report on the intercalation of two-dimensional Ti3C2, Ti3CN and TiNbC-so called MXenes. Intercalation of hydrazine, and its co-intercalation with N,N-dimethylformamide, resulted in increases of the c-lattice parameters of surface functionalized f-Ti3C2, from 19.5 to 25.48 and 26.8 Å, respectively. Urea is also intercalated into f-Ti3C2. Molecular dynamics simulations suggest that a hydrazine monolayer intercalates between f-Ti3C2 layers. Hydrazine is also intercalated into f-Ti3CN and f-TiNbC. When dimethyl sulphoxide is intercalated into f-Ti3C2, followed by sonication in water, the f-Ti3C2 is delaminated forming a stable colloidal solution that is in turn filtered to produce MXene 'paper'. The latter shows excellent Li-ion capacity at extremely high charging rates.