Optoelectronic Properties and Applications of MXene Quantum Dots

Abstract

MXene quantum dots (MQDs), as an emerging class of zero-dimensional nanomaterials, possess the quantum confinement effect, tunable bandgap structure, and excellent optoelectronic properties. It shows broad application prospects in fields such as sensing detection, biomedicine, optoelectronic devices, and energy and environment. This article systematically reviews the crystal structure, surface functional group characteristics, and size effect of MQDs. The mainstream preparation methods, such as hydrothermal/solvent thermal treatment, were introduced. The optical properties, such as ultraviolet-visible light absorption, tunable fluorescence emission, and nonlinear optical response, as well as key photovoltaic performances such as photoelectric conversion, photothermal effect, and carrier transport, were systematically investigated. The paper mainly elaborates on the application progress of MQDs in fields such as fluorescence sensing, biological imaging and diagnosis, photodetectors, photocatalysis, and energy storage. This article analyzes the prominent challenges currently faced by MXene quantum dots and looks forward to their future directions, which can provide a systematic reference for the basic research and engineering application of MQDs.