Process for the formation of metal oxide nanoparticles coating of a solid substrate

Patent metadata

Field	Value
Publication number	US-10119036-B2
Application number	US-201113821279-A
Country	US
Kind code	B2
Filing date	Sep 7, 2011
Priority date	Sep 7, 2010
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

The present invention provides a process for the formation of a coating comprising peroxynanoparticles of metals selected from the group consisting of: Ga, Ge, As, Se, In, Sn, Sb, Te, Tl, Pb and Bi on a solid substrate, comprising providing a basic solution containing at least a first metal selected from said group and hydrogen peroxide, and contacting said solution with a solid substrate having oxygen-containing chemically reactive groups on its surface.

First claim

The invention claimed is:

1. A process for forming a coating comprising metal oxide or mixed metal oxide nanoparticles of one or more metals selected from the group consisting of tin, antimony, germanium and tellurium on a solid substrate, comprising:
providing a basic metal-containing solution containing at least one metal selected from said group and hydrogen peroxide, and contacting said basic metal-containing solution with a solid substrate having oxygen-containing chemically reactive groups on its surface, wherein said solid substrate having oxygen-containing chemically reactive groups on its surface is contacted with said basic metal-containing solution and hydrogen peroxide solution under conditions allowing formation of peroxynanoparticle coating on the solid substrate upon addition of an antisolvent capable of inducing a precipitation of the peroxynanoparticle coating, wherein peroxynanoparticles present in the peroxynanoparticle coating have a diameter of less than 10 nm, with no agglomeration occurring in the basic metal-containing solution, as is evident by scanning electron microscopy or transmission electron microscopy; and
heat treating the peroxynanoparticle coating to obtain a metal oxide or mixed metal oxide nanoparticle coating layer of less than 20 nm; wherein the heat treating comprises calcining the peroxynanoparticle coating on the solid substrate at a temperature of 300-1000° C.

2. The process according to claim 1 , wherein at least one metal is present in the metal-containing solution in its highest oxidation state prior to addition of hydrogen peroxide to a metal-containing solution.

3. The process according to claim 1 , wherein the basic metal-containing solution comprises tin in its highest oxidation state (+4).

4. The process according to claim 3 , wherein the basic metal-containing solution further comprises antimony.

5. The process according to claim 1 , wherein a base present in the basic metal-containing solution is a nitrogen-containing base.

6. The process according to claim 1 , wherein the antisolvent is alcohol, acetonitrile, ethylacetate, ethers and mixtures thereof.

7. The process according to claim 1 , wherein the oxygen-containing chemically reactive group present on the surface of the solid substrate is selected from the group consisting of —OH, —OOH, ═O, M-O— wherein M indicates the solid substrate, carbonate and oxygenated SP2 carbon.

8. The process according to claim 1 , wherein the step of contacting the basic metal-containing solution with the solid substrate is performed by dip coating, spread coating, spray coating or spin coating.

9. The process according to claim 1 , wherein the solid substrate is selected from the group consisting of clays, sol-gel materials, and lithium niobate and calcite.

10. The process according to claim 1 , wherein the concentration of hydrogen peroxide in the basic metal-containing solution is between 1% and 50% weight percent.

11. The process according to claim 1 , wherein a pH of the basic metal-containing solution is higher than 9.

12. The process according to claim 1 , further comprising removing the solid substrate by means of a heat treatment or dissolution step to obtain a structure consisting of sheets made of peroxynanoparticles or metal oxide nanoparticles that are essentially devoid of substrate material.

Assignees

• Lev Ovadia
• Sladkevich Sergey
• Prikhodchenko Petr
• Gun Genia
• Yissum Res Dev Co Of Hebrew Univ Jerusalem Ltd
• Univ Nanyang Tech

Inventors

• Lev Ovadia
• Sladkevich Sergey
• Prikhodchenko Petr
• Gun Genia

Classifications

• C01B32/00

  Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48) · CPC title

• B01J35/0013

  Operations & Transport · mapped topic

• C01B15/04

  Metal peroxides or peroxyhydrates thereof; {Metal} superoxides; {Metal} ozonides; {Peroxyhydrates thereof} · CPC title

• C23C18/00

  Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating · CPC title

• C01B15/047

  of heavy metals · CPC title