Conductive inks and conductive polymeric coatings

• US 9,803,097 B2
• Filed: 10/21/2013
• Issued: 10/31/2017
• Est. Priority Date: 10/29/2012
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Bao, HongQian, Zin, Melvin, Julius, David, Leolukman, Melvina
• Primary Examiner(s): Kopec, Mark
• Assistant Examiner(s): Thomas, Jaison
• Application Number:
  US14/437,536
• Publication Number:
  US 20150275016A1
• Time in Patent Office: 1,471 Days
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C09D 11/037 characterised by the pigment
• CPC Class Codes: C09D 11/106 containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 11/324 containing carbon black
• CPC Class Codes: C09D 11/52 Electrically conductive inks
• CPC Class Codes: C09D 5/24 Electrically-conducting paints conductive materials H01B1/00
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: H01B 1/127 comprising five-membered aromatic rings in the main chain, e.g. polypyrroles, polythiophenes
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon

Abstract

A conductive ink and a conductive coating are provided. The conductive ink includes a conductive polymer solution comprising conductive polymer dissolved in an aqueous-based media and a mixture of carbon nanotubes and graphene oxide sheets dispersed in the conductive polymer solution, wherein a weight ratio of the carbon nanotubes to the graphene oxide sheets is in a range from 0.25 to 2.5. The conductive coating includes a conductive polymer and a mixture of graphene oxide sheets and carbon nanotubes dispersed in the conductive polymer, wherein a weight ratio of the carbon nanotubes to the graphene oxide sheets is in a range from 0.25 to 2.5, and wherein the conductive coating has an optical transmittance value at 550 nm of at least 75%.

Claims

1. A conductive ink, comprising:

a conductive polymer solution comprising conductive polymer dissolved in an aqueous-based media; and

a mixture of carbon nanotubes and graphene oxide sheets dispersed in the conductive polymer solution, wherein a weight ratio of the carbon nanotubes to the graphene oxide sheets is in a range from 0.25 to 2.5.

2. The conductive ink of claim 1, wherein the conductive polymer is present in the conductive polymer solution at a concentration in a range from 0.05 weight percent to 10 weight percent, based on a total weight of the conductive polymer solution.

3. The conductive ink of claim 1, wherein the graphene oxide sheets are present in the conductive polymer solution at a concentration in a range from 0.005 weight percent to 0.5 weight percent, based on a total weight of the conductive polymer solution.

4. The conductive ink of claim 1, wherein the conductive polymer is selected from the group consisting of polythiophenes, polyanilines, polyacetylenes, polypyrroles, polycarbazoles, polyindoles, polyazepines, polyfluorenes, polyphenylenes, polyphenylene vinylenes, polyphenylene sulfides, polypyrenes, polyazulenes, and polynaphthalenes, or mixtures thereof.

5. The conductive ink of claim 1, wherein the conductive polymer is selected from the group consisting of poly(3,4-ethylenedioxythiophene), poly(p-phenylene sulfide), poly(p-phenylene vinylene), or mixtures thereof.

6. The conductive ink of claim 1, wherein the conductive polymer is poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonate.

7. The conductive ink of claim 1, wherein the aqueous-based media comprises a water-miscible organic solvent, wherein the water-miscible organic solvent has a boiling point of up to 150°

C. at a pressure of 1 atmosphere.

8. The conductive ink of claim 1, further comprising a conductivity enhancer dissolved in the conductive polymer solution, wherein the conductivity enhancer has a boiling point of at least 150°

C. at a pressure of 1 atmosphere.

9. The conductive ink of claim 8, wherein the conductivity enhancer is selected from the group consisting of dimethylsulfoxide, ethylene glycol, diethylene glycol, glycerol, sorbitol, 2-methoxyphenol, or mixtures thereof.

10. The conductive ink of claim 1, wherein the weight ratio of the carbon nanotubes to the graphene oxide sheets is in a range from 0.25 to 2.

11. A method of providing a conductive coating on a substrate, comprising:

applying a conductive ink according to claim 1 to a substrate; and

annealing the conductive ink on the substrate to form the conductive coating on the substrate.

12. An article comprising a substrate having a surface, wherein the surface is coated with a conductive coating according to claim 1.

13. A conductive coating, comprising:

a conductive polymer; and

a mixture of graphene oxide sheets and carbon nanotubes dispersed in the conductive polymer, wherein a weight ratio of the carbon nanotubes to the graphene oxide sheets is in a range from 0.25 to 2.5, and wherein the conductive coating has an optical transmittance value at 550 nm of at least 75%.

14. The conductive coating of claim 13, wherein the graphene oxide sheets are present in a range from 0.1 weight percent to 5 weight percent relative to a total weight of the conductive coating.

15. The conductive coating of claim 13, wherein the conductive coating has an average sheet resistance value in a range from 800 ohm per square to 2800 ohm per square.