▎ 摘　　要

NOVELTY - Graphene quantum dot covalently functionalized two-dimensional transition metal carbide nonlinear nano-hybrid material, formed by the bonding of carboxy groups on the surface of graphene quantum dots (GQDs) with hydroxy groups on the surface of two-dimensional transition metal carbide Ti3C2Tx through an esterification reaction, is claimed. USE - Graphene quantum dot covalently functionalized two-dimensional transition metal carbide nonlinear nano-hybrid material used for optical limiting material, pulse laser, light detector, optical storage and optical switch. ADVANTAGE - The graphene quantum dot covalently functionalized two-dimensional transition metal carbide nonlinear nano hybrid material: exhibits a stronger nonlinear optical effect under the nanosecond laser of 532 nm; and exhibits an obvious anti-saturation absorption phenomenon under the irradiation of 532 nm, 12 ns of laser, when the incident energy is 108J, the nonlinear absorption coefficient and third-order polarizability virtual part value Im X of the material is 236.9 cm GW-1 and 9.73x10-14 esu based on the excellent anti-Saturation absorption performance of G-Ti3C2Tx, further extracting parameter to obtain light limiting threshold of material is 0.94 J cm-2. This value has exceeded the classical optical limiting material of fullerene (about 12.85J cm-2) and graphene oxide (2.90J cm-2), proves that G-Ti3C2Tx nano hybrid material has the potential of application as optical limiting device. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation method of graphene quantum dot covalently functionalized two-dimensional transition metal carbide nonlinear nano-hybrid material.