US 12,662,381 B2
Method for the manufacture of a self-standing graphene oxide or reduced graphene oxide film
Laura Megido Fernandez, Gijon Asturias (ES); Cristina Botas Velasco, Oviedo Asturias (ES); Thi Tan Vu, Oviedo (ES); and Roberto Suarez Sanchez, Avilés Asturias (ES)
Assigned to ArcelorMittal, Luxembourg (LU)
Appl. No. 18/036,972
Filed by ArcelorMittal, Luxembourg (LU)
PCT Filed Nov. 18, 2020, PCT No. PCT/IB2020/060848
§ 371(c)(1), (2) Date May 15, 2023,
PCT Pub. No. WO2022/106866, PCT Pub. Date May 27, 2022.
Prior Publication US 2024/0018004 A1, Jan. 18, 2024
Int. Cl. C01B 32/198 (2017.01); C01B 32/194 (2017.01)
CPC C01B 32/198 (2017.08) [C01B 32/194 (2017.08)] 15 Claims
 
1. A method for the manufacture of a self-standing graphene oxide or reduced graphene oxide film having a thickness between 0.4 and 4.0 μm, the method comprising the successive following steps:
A. preparing an aqueous dispersion including 0.1 to 30 g·L−1 of graphene oxide or reduced graphene oxide;
B. depositing the aqueous dispersion on a flat substrate coated with a polymeric film dissolvable in organic solvents and unsolvable in water, so as to form a wet film having a thickness between 1 μm and 3.5 mm;
C. drying the wet film to form a graphene oxide or reduced graphene oxide film on the polymeric film;
D. separating the polymeric film coated with the graphene oxide or reduced graphene oxide film from the flat substrate;
E. placing the polymeric film coated with the graphene oxide or reduced graphene oxide film in a support frame;
F. showering of the polymeric film with an organic solvent to dissolve the polymeric film and to obtain a framed graphene oxide or reduced graphene oxide film; and
G. separating the graphene oxide or reduced graphene oxide film from the frame to obtain the self-standing graphene oxide or reduced graphene oxide film.