Annealed metal nano-particle decorated nanotubes

Patent metadata

Field	Value
Publication number	US-11958747-B2
Application number	US-202117235825-A
Country	US
Kind code	B2
Filing date	Apr 20, 2021
Priority date	Dec 22, 2017
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Disclosed are methods and systems of providing carbon nanotubes decorated with polymer coated metal nanoparticles. Then, annealing the metal coated carbon nanotubes to reduce a quantity of hydrophilic components of the polymer coating.

First claim

What is claimed is:

1. A composition of matter comprising:
a first set of carbon nanotubes decorated with polymer-coated metal nanoparticles produced based on a mixture of a carbon nanotube dispersion and a polymer coated metal nanoparticle dispersion, wherein the polymer coating attaches the metal nanoparticles to the carbon nanotubes and reduces adsorption of water vapor by the metal nanoparticles;
a first amount of oxygenated functional groups achieved based on an annealing process with a temperature above 300 degrees Celsius, wherein the first amount is within twenty percent of a weight of the composition of matter; and
a first water contact angle achieved based on the annealing process, wherein the first water contact angle is higher than eighty two degrees.

2. The composition of matter of claim 1 , wherein the metal nanoparticles comprise a metal selected from a group consisting of palladium, iridium, rhodium, platinum, copper, nickel, chromium, ruthenium, silver and gold.

3. The composition of matter of claim 2 , wherein the metal nanoparticles are produced by using a mixture of two or more salts of two or more metal ion salts, wherein ions in the two or more metal ion salts are in a group comprising palladium, iridium, rhodium, platinum, copper, nickel, chromium, ruthenium, silver and gold ions.

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

5. The composition of matter of claim 1 , wherein the polymer coated metal nanoparticles comprises a polymer layer.

6. The composition of matter of claim 5 , wherein the polymer layer comprises polyvinylpyrrolidone, and wherein the metal nanoparticles comprise palladium or platinum.

7. The composition of matter of claim 1 , wherein the composition of matter is hydrophobic.

8. The composition of matter of claim 1 , wherein the annealing process is performed at above 350° C.

9. The composition of matter of claim 1 , wherein a residual polymer content of the composition of matter achieved based on the annealing process is less than 50%.

10. The composition of matter of claim 1 , wherein the annealing process is performed in a vacuum or inert gas environment.

11. A sensor for detecting gas, the sensor comprising:
an electrode assembly comprising electrodes; and
a gas-adsorbing material disposed between the electrodes of the electrode assembly, wherein the sensor is associated with a detection limit achieved based on an annealing process with a temperature above 300 degrees Celsius; and
wherein the gas-adsorbing material comprises:
a first set of carbon nanotubes decorated with polymer-coated metal nanoparticles produced based on a mixture of a carbon nanotube dispersion and a polymer coated metal nanoparticle dispersion, wherein the polymer coating attaches the metal nanoparticles to the carbon nanotubes and reduces adsorption of water vapor by the metal nanoparticles;
a first amount of oxygenated functional groups achieved based on the annealing process, wherein the first amount is within twenty percent of a weight of the composition of matter; and
a first water contact angle achieved based on the annealing process, wherein the first water contact angle is higher than eighty two degrees.

12. The sensor of claim 11 , wherein the metal nanoparticles comprise a metal selected from a group consisting of palladium, iridium, rhodium, platinum, copper, nickel, chromium, ruthenium, silver and gold.

13. The sensor of claim 12 , wherein the metal nanoparticles are produced by using a mixture of two or more salts of two or more metal ion salts, wherein ions in the two or more metal ion salts are in a group comprising palladium, iridium, rhodium, platinum, copper, nickel, chromium, ruthenium, silver and gold ions.

14. The sensor of claim 11 , wherein the carbon nanotubes comprise single-walled carbon nanotubes.

15. The sensor of claim 11 , wherein the polymer coated metal nanoparticles comprises a polymer layer.

16. The sensor of claim 15 , wherein the polymer layer comprises polyvinylpyrrolidone, and wherein the metal nanoparticles comprise palladium or platinum.

17. The sensor of claim 11 , wherein the composition of matter is hydrophobic.

18. The sensor of claim 11 , wherein the annealing process is performed at above 350° C.

19. The sensor of claim 11 , wherein a residual polymer content of the composition of matter achieved based on the annealing process is less than 50%.

20. The sensor of claim 11 , wherein the annealing process is performed in a vacuum or inert gas environment.

Assignees

• Palo Alto Res Ct Inc
• Us Administrator Of The Nasa
• Bay Systems Consulting Inc
• Stanford Res Inst Int

Inventors

• Iftime Gabriel
• Kim Beomseok
• Smith Clinton J
• Cocker Eric D
• Wei Junhua
• Schwartz David Eric
• Meyyappan Meyya
• Pandey Rahul
• Zhang Yong

Classifications

• C01B32/168 Primary

  After-treatment · CPC title

• C01B32/176

  Cutting · CPC title

• G01N27/12

  of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid {, for detecting components in the fluid} · CPC title

• G01N33/0036

  specially adapted to detect a particular component (physical analysis of gaseous biological material G01N33/497) · CPC title