Compositions of nanoparticles on solid surfaces

Patent metadata

Field	Value
Publication number	US-2017007986-A9
Application number	US-79971710-A
Country	US
Kind code	A9
Filing date	Apr 30, 2010
Priority date	Jun 10, 2005
Publication date	Jan 12, 2017
Grant date	—

Abstract

A method for producing nanoparticles on a substrate using a metal precursor in an ionic liquid and microwave heating is described. The composite compositions are useful as catalysts for chemical reactions, fuel cell, supercapacitor and battery components, and the like.

First claim

1 .- 10 . (canceled)

11 . A composite composition which comprises a substrate having nanoparticles of a metal deposited thereon, wherein:
(i) the substrate comprises one or more of graphite particles, carbon nanotubes, carbon fibers, and carbon buckyballs; (ii) the substrate has a nanoparticulate structure with at least one dimension that is less than 100 nanometers; and (iii) the deposited metal nanoparticles range in size between 0.5 nm and 3.5 nm.

12 . The composition of claim 11 wherein the nanoparticles of the metal are comprised of a noble metal alone or in combination with a transition metal.

13 . The composition of claim 11 wherein the nanoparticles of the metal comprise a metal alone or in combination with another metal.

14 . The composition of claim 11 wherein the deposited metal nanoparticles have a median size between 1.3 nm and 2.5 nm.

15 . The composition of claim 11 wherein the substrate comprises exfoliated graphite nanoplatelets.

16 . (canceled)

17 . The composition of claim 11 wherein the nanoparticles have been formed on the substrate by microwave irradiation of a precursor to the metal in a solution of an ionic liquid in a reducing liquid solvent.

18 . The composition of claim 11 wherein the metal is selected from the group consisting of platinum, ruthenium, nickel, iron, silver, gold, palladium, cobalt, tin, tungsten, chromium, molybdenum, and combinations thereof.

19 . A composite composition which comprises a substrate having nanoparticles of a metal deposited thereon, wherein:
(i) the substrate comprises graphite particles; and (ii) the substrate has a nanoparticulate structure with at least one dimension that is less than 100 nanometers.

20 . The composition of claim 19 wherein the deposited metal nanoparticles range in size between 0.5 nm and 3.5 nm.

21 . The composition of claim 20 wherein the deposited metal nanoparticles have a median size between 1.5 nm and 2 nm.

22 . The composition of claim 19 wherein the deposited metal nanoparticles have at least one dimension that is less than 10 nanometers.

23 . The composition of claim 19 wherein the nanoparticles of the metal are comprised of a noble metal alone or in combination with a transition metal.

24 . The composition of claim 19 wherein the metal is selected from the group consisting of platinum, ruthenium, nickel, iron, silver, gold, palladium, cobalt, tin, tungsten, chromium, molybdenum, and combinations thereof.

25 . The composition of claim 19 wherein the substrate comprises exfoliated graphite nanoplatelets.

26 . The composition of claim 19 wherein the nanoparticles have been formed on the substrate by microwave irradiation of a precursor to the metal in a solution of an ionic liquid in a reducing liquid solvent.

27 . A composite composition which comprises a substrate having nanoparticles of a metal deposited thereon, wherein:
(i) the substrate comprises carbon black; (ii) the substrate has a nanoparticulate structure with at least one dimension that is less than 100 nanometers; (iii) the deposited metal nanoparticles range in size between 0.4 nm and 3.5 nm; and (iv) the deposited metal nanoparticles have a median size between 1 nm and 2 nm.

28 . The composition of claim 27 wherein the nanoparticles of the metal are comprised of a noble metal alone or in combination with a transition metal.

29 . The composition of claim 27 wherein the metal is selected from the group consisting of platinum, ruthenium, nickel, iron, silver, gold, palladium, cobalt, tin, tungsten, chromium, molybdenum, and combinations thereof.

30 . The composition of claim 27 wherein the nanoparticles have been formed on the substrate by microwave irradiation of a precursor to the metal in a solution of an ionic liquid in a reducing liquid solvent.

Assignees

• Drzal Lawrence T
• Do In-Hwan
• Fukushima Hiroyuki
• Univ Michigan State

Inventors

• Drzal Lawrence T
• Do In-Hwan
• Fukushima Hiroyuki

Classifications

• B01J23/40 Primary

  of the platinum group metals · CPC title

• C01B32/168

  After-treatment · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• B22F9/24 Primary

  starting from liquid metal compounds, e.g. solutions · CPC title

• B82B3/00 Primary

  Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units · CPC title