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US 11,296,243 B2Granted
Physical forms of MXene materials exhibiting novel electrical and optical characteristics
AssigneeDrexel University
InventorsMichael J Ghidiu, Michel W Barsoum, Yury Gogotsi, Aaron Thomas Fafarman, Andrew DeVries Dillon
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Abstract
The present invention(s) is directed to novel conductive Mn+1Xn(Ts) compositions exhibiting high volumetric capacitances, and methods of making the same. The present invention(s) is also directed to novel conductive Mn+1Xn(Ts) compositions, methods of preparing transparent conductors using these materials, and products derived from these methods.
Claims28
A method comprising,
- (a) applying a MXene dispersion onto a substrate surface, said MXene dispersion comprising at least one type of MXene platelets dispersed in a solvent;
- and
- (b) removing at least a portion of solvent so as to provide a coated film of at least one layer of MXene platelets oriented to be essentially coplanar with the substrate surface,
- said MXene platelets comprising a Mn+1Xn(Ts) composition having at least one layer, each 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,
- wherein M is at least one Group 3, 4, 5, 6, or 7,
- wherein each X is C, N, or a combination thereof and
- n=1, 2, or 3;
- wherein at least one of said surfaces of the layers has surface terminations, Ts, independently comprising alkoxide, alkyl, carboxylate, halide, hydroxide, hydride, oxide, sub- oxide, nitride, sub-nitride, sulfide, sulfonate, thiol, or a combination thereof;
- said coated film being electrically conductive and exhibiting:
- (i) a resistivity in a range of from about 0.01 to about 1000 micro-ohm-meters,
- (ii) an ability to transmit at least about 50%, at least about 55%, at least about 60%, at least about 65%, at least about 70%, at least about 75%, at least about 80%, at least about 85%, at least about 90%, or at least about 95% of incident light of at least one wavelength in a range of from about 300 nm to about 2000 nm
- (iii) a ratio of DC conductivity, measured in Siemens/meter, to light absorbance, (including visible light absorbance), measured as a decadic absorbance per meter, of at least 0.1 Siemens measured at at least one wavelength in the range of 300 to 2500 nm;
- (iv) a value of the real dielectric permittivity less than negative one for wavelengths greater than a threshold wavelength, for example, 500 nm;
- or
- (v) a combination of any two or more of (i), (ii), (iii), and (iv),
- wherein the Mn−1Xn(Ts) composition comprises a plurality of Mn+1Xn(Ts) platelets having at least one mean lateral dimension in a range of from about 0.1 micron to about 50 microns.
15 more elements
A method comprising,
- (a) applying a MXene dispersion onto a substrate surface, said MXene dispersion comprising at least one type of MXene platelets dispersed in a solvent and
- (b) removing at least a portion of solvent so as to provide a coated film of at least one layer of MXene platelets oriented to be essentially coplanar with the substrate surface,
- said MXene platelets comprising a Mn+1Xn(Ts) composition having at least one layer, each 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,
- wherein M is at least one Group 3, 4, 5, 6, or 7,
- wherein each X is C, N, or a combination thereof and p1 n=1, 2, or 3,
- wherein at least one of said surfaces of the layers has surface terminations, Ts, independently comprising alkoxide, alkyl, carboxylate, halide, hydroxide, hydride, oxide, sub-oxide, nitride, sub-nitride, sulfide, sulfonate, thiol, or a combination thereof;
- said coated film being electrically conductive and exhibiting:
- (i) a resistivity in a range of from about 0.01 to about 1000 micro-ohm-meters,
- (ii) an ability to transmit at least about 50%, at least about 55%, at least about 60%, at least about 65%, at least about 70%, at least about 75%, at least about 80%, at least about 85%, at least about 90%, or at least about 95% of incident light of at least one wavelength in a range of from about 300 nm to about 2000 nm
- (iii) a ratio of DC conductivity, measured in Siemens/meter, to light absorbance, (including visible light absorbance), measured as a decadic absorbance per meter, of at least 0.1 Siemens measured at at least one wavelength in the range of 300 to 2500 nm;
- (iv) a value of the real dielectric permittivity less than negative one for wavelengths greater than a threshold wavelength, for example, 500 nm;
- or
- (v) a combination of any two or more of (i), (ii), (iii), and (iv),
- further wherein M comprises at least two Group 4, 5, 6, or 7 metals, and the Mn+1Xn(Ts) composition is represented by a formula M′2M″mXm+1(Ts).
13 more elements
Dependencies are inferred from the claim text.