Method for Manufacturing Nano-Graphene Sheets
First Claim
1. A method for manufacturing nano-graphene sheets, comprising steps of:
- intercalating and oxidizing a graphite material to form a graphite oxide by mixing the graphite material with at least one intercalation agent and at least one oxidant;
contacting the graphite oxide with a heat source to thermally flake the graphite oxide to a plurality of nano-graphite sheets;
suspending the nano-graphite sheets in a liquid medium and applying a mechanical shear force to mechanically flake the nano-graphite sheets such that a lateral size and a thickness of the nano-graphite sheets are reduced to form a nano-graphene suspension solution;
separating the nano-graphene sheets from the nano-graphene suspension solution and drying the nano-graphene sheets;
placing the nano-graphene sheets into a reductant atmosphere and heating up to a heat treatment temperature to reduce an oxygen content of the nano-graphene sheets so as to decrease crystal defects.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for manufacturing nano-graphene sheets, includes: intercalating and oxidizing a graphite material to form a graphite oxide by mixing the graphite material with an intercalation agent and oxidant; contacting the graphite oxide with a heat source to thermally flake the graphite oxide to nano-graphite sheets; suspending the nano-graphite sheets in a liquid medium and applying a mechanical shear force larger than 5,000 psi to mechanically flake the nano-graphite sheets for reducing the lateral size and thickness to form a nano-graphene suspension solution; separating the nano-graphene sheets from the nano-graphene suspension solution and drying the nano-graphene sheets; and finally reducing and heat treating the nano-graphene sheets to lower the oxygen content to less than 3 wt % and decrease the crystal defects.
-
Citations
11 Claims
-
1. A method for manufacturing nano-graphene sheets, comprising steps of:
-
intercalating and oxidizing a graphite material to form a graphite oxide by mixing the graphite material with at least one intercalation agent and at least one oxidant; contacting the graphite oxide with a heat source to thermally flake the graphite oxide to a plurality of nano-graphite sheets; suspending the nano-graphite sheets in a liquid medium and applying a mechanical shear force to mechanically flake the nano-graphite sheets such that a lateral size and a thickness of the nano-graphite sheets are reduced to form a nano-graphene suspension solution; separating the nano-graphene sheets from the nano-graphene suspension solution and drying the nano-graphene sheets; placing the nano-graphene sheets into a reductant atmosphere and heating up to a heat treatment temperature to reduce an oxygen content of the nano-graphene sheets so as to decrease crystal defects. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification