Abstract
High-quality V2C–VO2-heterostructured MXene-derived quantum dots (MQDs) were hydrothermally fabricated and characterized using microscopic, crystallographic, and spectroscopic methods. Open-aperture Z-scans were employed to investigate the nonlinear optical absorption of the MQDs irradiated using picosecond pulses at 532 nm. The results showed that the heterostructure converted the nonlinear optical behavior from saturable absorption to reverse saturable absorption. In individual V2C MQDs, saturable absorption was ascribed to the bleaching of ground-state free electrons, while in heterostructured V2C–VO2 MQDs, reverse saturable absorption was derived from two-photon-induced free-carrier absorption. The nonlinear absorption coefficient of the V2C–VO2 heterostructured MQDs was comparable to those of previously reported MQDs. This research could provide insight into the integration of heterostructured MQDs and promote the advanced photonics of MQDs and their applications in optoelectronic devices.
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