Transparent substrates comprising three-dimensional porous conductive graphene films and methods for making the same

Patent metadata

Field	Value
Publication number	US-11059741-B2
Application number	US-201716350090-A
Country	US
Kind code	B2
Filing date	Mar 21, 2017
Priority date	Mar 21, 2016
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

Disclosed herein are graphene coatings characterized by a porous, three-dimensional, spherical structure having a hollow core, along with methods for forming such graphene coatings on glasses, glass-ceramics, ceramics, and crystalline materials. Such coatings can be further coated with organic or inorganic layers and are useful in chemical and electronic applications.

First claim

What is claimed is:

1. An article comprising:
a dense substrate comprising a glass, a glass ceramic, a ceramic, an inorganic crystalline or polycrystalline material, the dense substrate has a surface roughness (Ra) of 2 nm or less; and
a coating layer having a thickness from about 500 nm to about 800 μm adhered to the substrate, the coating layer comprising a porous, three-dimensional construction having an average surface area from about 200 m 2 /g to about 2200 m 2 /g, the porous, three-dimensional construction comprising a random network of a plurality of three-dimensional graphene structures having hollow cores,
wherein the three-dimensional graphene structure is spherical and has an average diameter from about 20 nm to about 500 nm.

2. The article of claim 1 , wherein the hollow core of the at least one three-dimensional graphene structure is substantially free of a metal or metal oxide.

3. The article of claim 1 , wherein the average diameter as measured by scanning electron microscope of the at least one three-dimensional graphene structure is from about 50 nm to about 500 nm.

4. The article of claim 1 , wherein the average surface area of the porous, three-dimensional construction is from about 500 to 1500 m 2 /g.

5. The article of claim 1 , wherein the porous, three-dimensional construction has a porosity of from about 90% to about 99.6% as measured by scanning electron microscope.

6. The article of claim 1 , wherein
the dense substrate is transparent; and
the adhesion of the coating layer to the dense substrate exhibits an effective adhesion energy at the interface of the coating layer and the substrate of from about 0.1 J/m 2 to about 4 J/m 2 .

7. The article of claim 1 , wherein the dense substrate comprises a transparent material and the optical transmission of the article, as measured by ultraviolet-visible spectroscopy, is greater than 60% at 550 nm.

8. The article of claim 1 , wherein the substrate comprises fused silica.

9. An article comprising:
a substrate that is dense and transparent, the substrate comprising a glass and a thickness of 0.1 mm to 2.5 mm, the substrate having a surface roughness (Ra) of 2 nm or less; and
a porous coating on the substrate, the porous coating comprising a random network of a plurality of spherical hollow graphene structures having an average diameter from about 20 nm to about 500 nm, wherein the porous coating has an average surface area from about 200 m 2 /g to about 2200 m 2 /g, and a thickness of 20 nm to 800 nm;
wherein the article has a transmittance of 40% to 80% at 550 nm, and the coating has a sheet resistance of 1.5 kQ/sq to 10 kQ/sq; and
wherein adhesion of the coating to the substrate exhibits an effective adhesion energy at an interface of the coating and the substrate of from about 0.1 J/m 2 to about 4 J/m 2 .

10. The article of claim 9 , wherein the substrate is fused silica.

11. The article of claim 9 , wherein the substrate further comprises copper, the amount of which decreases as a function of distance into the substrate from the interface.

Assignees

• Corning Inc
• Icfo—The Inst Of Photonic Sciences
• Inst Catalana De Recerca I Estudis Avancats Icrea

Inventors

• Li Connie
• Liu Xinyuan
• Martin-Frances Miriam Marchena
• Pruneri Valerio
• Senaratne Wageesha
• Song Zhen
• Soni Kamal Kishore

Classifications

• C01B32/182

  Graphene · CPC title

• C03C17/22 Primary

  with other inorganic material (C03C17/34, C03C17/44 take precedence) · CPC title

• C01B32/186

  by chemical vapour deposition [CVD] · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C01P2004/34

  hollow · CPC title