Plasma processes for producing graphene nanosheets
US10843925B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2020 |
| Grant date | Nov 24, 2020 |
| Priority date | — |
| Expiry date | Aug 31, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/13
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided are plasma processes for producing graphene nanosheets comprising injecting into a thermal zone of a plasma a carbon-containing substance at a velocity of at least 60 m/s standard temperature and pressure STP to nucleate the graphene nanosheets, and quenching the graphene nanosheets with a quench gas of no more than 1000° C. The injecting of the carbon-containing substance may be carried out using a plurality of jets. The graphene nanosheets may have a Raman G/D ratio greater than or equal to 3 and a 2D/G ratio greater than or equal to 0.8, as measured using an incident laser wavelength of 514 nm. The graphene nanosheets may be produced at a rate of at least 80 g/h. The graphene nanosheets can have a polyaromatic hydrocarbon concentration of less than about 0.7% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.