Process for producing continuous graphitic fibers from living graphene molecules
First Claim
1. A process for producing a continuous graphitic fiber from living graphene molecules, said process comprising:
- (a) preparing a graphene oxide gel having living graphene oxide molecules or functionalized graphene chains dissolved in a fluid medium wherein said graphene oxide molecules contain an oxygen content higher than 10% by weight;
(b) dispensing and depositing at least a continuous filament of said graphene oxide gel onto a supporting substrate, wherein said dispensing and depositing procedure includes mechanical stress-induced molecular alignment of said living graphene oxide molecules or functionalized graphene chains along a filament axis direction;
(c) partially or completely removing said fluid medium from said continuous filament to form a continuous graphene oxide fiber, wherein said graphene oxide fiber has an inter-plane spacing d002 of 0.4 nm to 1.2 nm as determined by X-ray diffraction and an oxygen content no less than 10% by weight; and
(d) heat treating the continuous graphene oxide fiber to form said continuous graphitic fiber at a heat treatment temperature higher than 100°
C. to an extent that an inter-plane spacing d002 is decreased to a value of from 0.3354 nm to 0.4 nm and the oxygen content is decreased to less than 5% by weight.
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Abstract
A process for producing a continuous graphitic fiber, comprising: (a) preparing a graphene oxide gel having living graphene oxide molecules or functionalized graphene chains dissolved in a fluid medium; (b) depositing at least a continuous filament of graphene oxide gel onto a supporting substrate under a condition of stress-induced molecular alignment of living graphene oxide molecules along a filament axis direction; (c) removing the fluid medium to form a continuous graphene oxide fiber, having an inter-plane spacing d002 of 0.4 nm to 1.2 nm and an oxygen content no less than 5% by weight; and (d) heat treating the continuous graphene oxide fiber to form the continuous graphitic fiber at a temperature higher than 100° C. (preferably >600° C.) to an extent that an inter-plane spacing d002 is decreased to a value of 0.3354-0.4 nm and the oxygen content is decreased to less than 5% by weight.
11 Citations
43 Claims
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1. A process for producing a continuous graphitic fiber from living graphene molecules, said process comprising:
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(a) preparing a graphene oxide gel having living graphene oxide molecules or functionalized graphene chains dissolved in a fluid medium wherein said graphene oxide molecules contain an oxygen content higher than 10% by weight; (b) dispensing and depositing at least a continuous filament of said graphene oxide gel onto a supporting substrate, wherein said dispensing and depositing procedure includes mechanical stress-induced molecular alignment of said living graphene oxide molecules or functionalized graphene chains along a filament axis direction; (c) partially or completely removing said fluid medium from said continuous filament to form a continuous graphene oxide fiber, wherein said graphene oxide fiber has an inter-plane spacing d002 of 0.4 nm to 1.2 nm as determined by X-ray diffraction and an oxygen content no less than 10% by weight; and (d) heat treating the continuous graphene oxide fiber to form said continuous graphitic fiber at a heat treatment temperature higher than 100°
C. to an extent that an inter-plane spacing d002 is decreased to a value of from 0.3354 nm to 0.4 nm and the oxygen content is decreased to less than 5% by weight. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A process for producing a continuous graphitic fiber, said process comprising:
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(a) preparing a graphene oxide or functionalized graphene solution having living graphene oxide molecules or functionalized graphene chains dissolved or dispersed in a fluid medium wherein said graphene oxide molecules contain an oxygen content higher than 5% by weight; (b) dispensing and depositing at least a continuous filament of said graphene oxide or functionalized graphene solution onto a supporting substrate, wherein said dispensing and depositing procedure includes mechanical stress-induced molecular alignment or ordering of said living graphene oxide molecules or functionalized graphene chains along a filament axis direction; (c) partially or completely removing said fluid medium from said continuous filament to form a continuous graphene oxide or functionalized graphene fiber; and (d) heat treating the continuous graphene oxide or functionalized graphene fiber to form said continuous graphitic fiber at a heat treatment temperature higher than 100°
C. to an extent that an inter-plane spacing d002 is decreased to a value in the range from 0.3354 nm to 0.4 nm and the oxygen content is decreased to less than 5% by weight.
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43. A process for producing a continuous graphitic fiber, said process comprising:
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(a) preparing a graphene suspension having graphene sheets dispersed in a fluid medium; (b) dispensing and depositing at least a continuous filament of said graphene suspension onto a supporting substrate under the influence of a stress field to induce alignment or ordering of said graphene sheets along a filament axis direction; (c) partially or completely removing said fluid medium from said continuous filament to form a continuous graphene fiber containing closely packed and parallel graphene sheets; and (d) heat treating the continuous graphene fiber to form said continuous graphitic fiber at a heat treatment temperature higher than 600°
C. to an extent that an inter-plane spacing d002 is decreased to a value in the range from 0.3354 nm to 0.4 nm.
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Specification