Methods of increasing the thickness of colloidal nanosheets and materials consisting of said nanosheets

• US 10,644,175 B2
• Filed: 05/01/2017
• Issued: 05/05/2020
• Est. Priority Date: 10/19/2011
• Status: Active Grant

• Current Assignee: Nexdot
• Original Assignee: Nexdot
• Inventors: Mahler, Benoit
• Primary Examiner(s): Weddle, Alexander M
• Application Number:
  US15/582,996
• Publication Number:
  US 20170236959A1
• Time in Patent Office: 1,100 Days
• Field of Search: 427215
• CPC Class Codes: B01J 27/04 Sulfides
• CPC Class Codes: B01J 27/0573 Selenium; Compounds thereof
• CPC Class Codes: B01J 27/0576 Tellurium; Compounds thereof
• CPC Class Codes: B01J 35/23 in a colloidal state
• CPC Class Codes: B01J 35/40 characterised by dimensions, e.g. grain size in a colloidal state B01J35/23; crystallite size B01J35/77
• CPC Class Codes: B01J 35/58 Fabrics or filaments
• CPC Class Codes: B05D 1/00 Processes for applying liquids or other fluent materials B05D5/00, B05D7/00 take precedence
• CPC Class Codes: B82B 1/005 Constitution or structural means for improving the physical properties of a device
• CPC Class Codes: B82B 3/0033 Manufacture or treatment of substrate-free structures, i.e. not connected to any support
• CPC Class Codes: B82Y 15/00 Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: C01B 19/007 Tellurides or selenides of metals C01B19/002 takes precedence
• CPC Class Codes: H01L 21/02521 Materials
• CPC Class Codes: H01L 21/02601 Nanoparticles fullerenes H10K85/211
• CPC Class Codes: H01L 21/02628 using solutions
• CPC Class Codes: H01L 29/127 Quantum box structures
• CPC Class Codes: H01L 31/035218 the quantum structure being quantum dots
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]

Abstract

A process of growth in the thickness of at least one facet of a colloidal inorganic sheet. By sheet is meant a structure having at least one dimension, the thickness, of nanometric size and lateral dimensions great compared to the thickness, typically more than 5 times the thickness. By homostructured is meant a material of homogeneous composition in the thickness and by heterostructured is meant a material of heterogeneous composition in the thickness. The process allows the deposition of at least one monolayer of atoms on at least one inorganic colloidal sheet, this monolayer being constituted of atoms of the type of those contained or not in the sheet. Homostructured and heterostructured materials resulting from such process as well as the applications of the materials are also described.

Claims

1. An inorganic colloidal nanoparticle comprising an initial inorganic nanosheet with thickness less than 1 μ

m and lateral dimensions at least 1.5 times greater than thickness, at least one layer of inorganic material covering said initial inorganic nanosheet so as to increase thickness of said initial inorganic nanosheet, wherein the initial inorganic nanosheet and the at least one layer of inorganic material comprise at least two different materials.

2. The inorganic colloidal nanoparticle according to claim 1, wherein the inorganic colloidal nanoparticle is a nanosheet.

3. The inorganic colloidal nanoparticle according to claim 1, wherein the inorganic colloidal nanoparticle has a thickness of 0.5 nm to 10 mm.

4. The inorganic colloidal nanoparticle according to claim 1, wherein the inorganic colloidal nanoparticle has a lateral size larger than 0.75 nm.

5. The inorganic colloidal nanoparticle according to claim 1, wherein the initial nanosheet and the at least one layer comprise a material MxEy, wherein

M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and a mixture thereof,

E is selected from the group consisting of O, S, Se, Te, N, P, As, F, Cl, Br, I, and a mixture thereof, and

x and y are independently a decimal number from 0 to 5.

6. The inorganic colloidal nanoparticle according to claim 1, wherein the initial nanosheet and the at least one layer comprise a material selected from the group consisting of group II-VI, group II-V, group group III-V, group IV-VI, group group II-IV-VI, group II-IV-V and a mixture thereof.

7. The inorganic colloidal nanoparticle according to claim 1, wherein the initial nanosheet and the at least one layer comprise a material selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, HgO, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbS, PbSe, PbTe, GeS₂, GeSe₂, SnS₂, SnSe₂, CuInS₂, CuInSe₂, AgInS₂, AgInSe₂, CuS, Cu₂S, Ag₂S, Ag₂Se, Ag₂Te, FeS, FeS₂, InP, Cd₃P₂, Zn₃P₂, CdO, ZnO, FeO, Fe₂O₃, Fe₃O₄, Al₂O₃, TiO₂, MgO, MgS, MgSe, MgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, and a mixture thereof.

8. The inorganic colloidal nanoparticle according to claim 1, wherein the at least one layer is doped by a transition metal or a lanthanide.

9. A product comprising at least one inorganic colloidal nanoparticle according to claim 1, wherein the product is a luminescent system or an electroluminescent system or an amplifying stage of a laser, or a catalyst or a photovoltaic cell or a transistor.

10. The inorganic colloidal nanoparticle according to claim 1, wherein thickness of initial inorganic nanosheet is greater than 0.3 nm and less than 500 nm.

11. An inorganic colloidal nanoparticle comprising an initial inorganic nanosheet with thickness less than 1 μ

m and lateral dimensions at least 1.5 times greater than thickness, and at least two layers of inorganic material wherein first layer covers all or part of said initial inorganic nanosheet so as to increase thickness of said initial inorganic nanosheet, wherein second layer covers all or part of the first layer; and

wherein the initial inorganic nanosheet and the at least two layers of inorganic material are of different compositions.