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US 9,193,595 B2Granted
Compositions comprising free-standing two-dimensional nanocrystals
AssigneeDrexel University
InventorsMichel W. Barsoum, Yury Gogotsi, Michael Naguib Abdelmalak, Olha Mashtalir
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Abstract
The present invention is directed to compositions comprising free standing and stacked assemblies of two dimensional crystalline solids, and methods of making the same.
Claims26
A composition comprising at least one layer having first and second surfaces, each layer comprising:
- a substantially two-dimensional array of crystal cells,
- each crystal cell having an empirical formula of Mn+1Xn, such that each X is positioned within an octahedral array of M,
- wherein M is at least one Group IIIB, IVB, VB, or VIB metal,
- wherein each X is C, N, or a combination thereof;
- n=1, 2 or 3;
- and
- wherein at least one of said surfaces of each layer has surface terminations comprising alkoxide, carboxylate, halide, hydroxide, hydride, oxide, sub-oxide, nitride, sub-nitride, sulfide, thiol, or a combination thereof.
4 more elements
A stacked assembly of at least two layers, each layer having first and second surfaces, each layer comprising:
- a substantially two-dimensional array of crystal cells,
- each crystal cell having the empirical formula of Mn+1Xn, such that each X is positioned within an octahedral array of M;
- wherein M is a Group IIIB, IVB, VB, or VIB metal;
- each X is C, N, or a combination thereof;
- and
- n=1, 2, or 3;
- wherein the layers are characterized as having an average surface area and an average interlayer distance;
- and
- wherein at least one of said surfaces of each layer has bound thereto surface terminations comprising alkoxide, carboxylate, halide, hydroxide, hydride, oxide, sub-oxide, nitride, sub-nitride, sulfide, thiol, or a combination thereof.
6 more elements
A method of preparing a composition comprising:
- removing substantially all of the A atoms from a MAX-phase composition having an empirical formula of Mn+1AXn;
- wherein M is at least one Group IIIB, IVB, VB, or VIB metal;
- wherein A is an A-group element;
- each X is C, N, or a combination thereof;
- and
- n=1, 2, or 3,
- thereby providing a composition comprising at least one layer having a first and second surface, each layer comprising a substantially two-dimensional array of crystal cells;
- each crystal cell having an empirical formula of Mn+1Xn, such that each X is positioned within an octahedral array of M;
- and
- wherein at least one of said surfaces of each layer has surface terminations comprising alkoxide, carboxylate, halide, hydroxide, hydride, oxide, sub-oxide, nitride, sub-nitride, sulfide, thiol, or a combination thereof.
7 more elements
Dependencies are inferred from the claim text.