Patent ID: 11939703
Assignee: ROBERT BOSCH GMBH
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D  H | IPC D

Claim 14:
15. A process for producing graphene fibers, the process comprising the steps:
a. providing single-layer or multilayer graphene flakes or graphene oxide flakes based on graphene or on graphene oxide,
b. applying a transition metal or a transition metal oxide to the graphene flakes or graphene oxide flakes by a deposition process,
c. wet spinning or dry spinning a graphene fiber or graphene oxide fiber by injection of a spinning solution comprising in dispersed form the graphene flakes or graphene oxide flakes obtained from step b),
d. reducing the graphene fiber or the graphene oxide fiber in a process atmosphere containing hydrogen at a defined treatment temperature, wherein a graphene oxide fiber, if present, is reduced to a graphene fiber, wherein the graphene fiber or graphene oxide fiber is treated such that the transition metal oxide in step d) is only partially reduced or such that the transition metal in a step following step d) is partially oxidized, wherein the partial reduction or partial oxidation takes place such that in the finished graphene fiber there is a defined fraction of the transition metal oxide that is less than 10% by weight.