2D nanomaterial fiber and method of fabricating the same

1 . A nanomaterial fiber containing a 2-dimensional (2D) nanomaterial oriented in a longitudinal direction of the fiber,

wherein the oriented 2D nanomaterial forms nanomaterial layers which are spontaneously stacked layer-by-layer,

wherein a cross section parallel to the nanomaterial layer is a flat plate-type fibrous cross section, and

wherein a Herman's orientation parameter based on the wide-angle X-ray scattering (WAXS) results is greater than or equal to 0.82.

2 . The nanomaterial fiber of claim 1 , wherein the flat plate-type fibrous cross section is elongated in a transverse direction of the fiber, and a ratio (D/t) of a thickness (t) of the flat plate-type fibrous cross section to a length (D) of the plate-type fibrous cross section in a transverse direction is greater than or equal to 2.

3 . The nanomaterial fiber of claim 1 , wherein the 2D nanomaterial comprises graphene, graphene oxide, MXene, a transition metal dichalcogenide (TMD), a metal oxide, silicene, germanene, borophene, stanene, phosphorene, hexagonal-boron nitride (h-BN), or a combination thereof.

4 . The nanomaterial fiber of claim 1 , wherein the fiber further contains polymers.

5 . The nanomaterial fiber of claim 1 , wherein a modulus of elasticity of the fiber satisfies the following Expression 1:

YM 1/ YM 2≥2,  [Expression 1]

wherein YM1 represents a modulus of elasticity of the nanomaterial fiber, and YM2 represents a modulus of elasticity of a reference fiber which is a nanomaterial fiber having a circular cross section, which consists of the same 2D nanomaterial.

6 . The nanomaterial fiber of claim 1 , wherein a tensile strength of the fiber satisfies the following Expression 2:

TS 1/ TS 2≥2.5,  [Expression 2]

wherein TS1 represents a tensile strength of the nanomaterial fiber, and TS2 represents a tensile strength of a reference fiber which is a nanomaterial fiber having a circular cross section, which consists of the same 2D nanomaterial.