Metal nanoparticle-decorated nanotubes for gas sensing

Patent metadata

Field	Value
Publication number	US-11327036-B2
Application number	US-202016996239-A
Country	US
Kind code	B2
Filing date	Aug 18, 2020
Priority date	Apr 28, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Disclosed herein are embodiments of compositions for gas sensing and sensors utilizing the same. In one embodiment, a composition comprises carbon nanotubes and polymer-coated metal nanoparticles bound to the carbon nanotubes.

First claim

What is claimed is:

1. A composition comprising:
carbon nanotubes having an average degree of functionalization with carboxylic acid groups and/or hydroxyl groups that is less than 3 percent by weight (wt %) based on a total weight of the carbon nanotubes; and
polymer-coated metal nanoparticles bound to the carbon nanotubes, wherein the carbon nanotubes are not coated by polymer materials that coat the polymer-coated metal nanoparticles.

2. The composition of claim 1 , wherein the polymer-coated metal nanoparticles are non-covalently bound to the carbon nanotubes.

3. The composition of claim 1 , wherein the carbon nanotubes are substantially free of carboxylic acid functional groups and hydroxyl functional groups.

4. The composition of claim 1 , wherein the carbon nanotubes comprise single-walled carbon nanotubes or multi-wall carbon nanotubes.

5. The composition of claim 1 , wherein the polymer-coated metal nanoparticles each comprise a metallic core and a polymer layer covalently bound to the metallic core.

6. The composition of claim 5 , wherein the polymer layer comprises a hydrophobic polymer.

7. The composition of claim 5 , wherein the metallic core comprises a metal selected from a group consisting of palladium, iridium, rhodium, platinum, and gold.

8. The composition of claim 5 , wherein the polymer layer comprises poly(vinylpyrrolidinone), and wherein the metallic core comprises palladium.

9. The composition of claim 1 , wherein the composition is dispersed in an organic solvent.

10. The composition of claim 1 , wherein the polymer-coated metal nanoparticles are coated with a hydrophobic polymer layer.

11. The composition of claim 1 , wherein the carbon nanotubes are substantially free of carboxylic acid functional groups and hydroxyl functional groups.

12. The composition of claim 1 , wherein the carbon nanotubes comprise single-walled carbon nanotubes or multi-wall carbon nanotubes.

13. A composition comprising:
carbon nanotubes having an average degree of functionalization with carboxylic acid groups and/or hydroxyl groups that is less than 3 percent by weight (wt %) based on a total weight of the carbon nanotubes, and
polymer-coated metal nanoparticles bound to the carbon nanotubes, wherein the polymer-coated metal nanoparticles each comprise a metallic core, and a polymer layer is covalently bound to the metallic core.

14. A composition comprising:
carbon nanotubes having an average degree of functionalization with carboxylic acid groups and/or hydroxyl groups that is less than 3 percent by weight (wt %) based on a total weight of the carbon nanotubes; and
polymer-coated metal nanoparticles bound to the carbon nanotubes, wherein the polymer-coated metal nanoparticles each comprise a metallic core, and a polymer layer is covalently bound to the metallic core, wherein the polymer layer comprises a hydrophobic polymer.

15. The composition of claim 14 , wherein the metallic core comprises a metal selected from a group consisting of palladium, iridium, rhodium, platinum, and gold.

16. The composition of claim 14 , wherein the polymer layer comprises poly(vinylpyrrolidinone), and wherein the metallic core comprises palladium.

17. The composition of claim 14 , wherein the composition is dispersed in an organic solvent.

18. The composition of claim 14 , wherein the carbon nanotubes are substantially free of carboxylic acid functional groups and hydroxyl functional groups.

19. The composition of claim 14 , wherein the carbon nanotubes comprise single-walled carbon nanotubes or multi-wall carbon nanotubes.

Assignees

• Palo Alto Res Ct Inc

Inventors

• Iftime Gabriel
• Smith Clinton
• Schwartz David Eric
• Zhang Yong
• Vedharathinam Vedasri

Classifications

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B01J20/205 Primary

  Carbon nanostructures, e.g. nanotubes, nanohorns, nanocones, nanoballs (carbon nanotubes per se C01B32/15) · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C22C2026/002

  Carbon nanotubes · CPC title

• B01J20/327

  Polymers obtained by reactions involving only carbon to carbon unsaturated bonds · CPC title