Preparation And Performance Research Of MXenes Quantum Dots And Nanosheets

1.The dependence of the properties of the Ti₃C₂T_x MXene nanosheets on the different solvents including dimethylformamide?DMF?,ethanol,and DMSO in ultrasonication–solvothermal treatment of bulk Ti₃C₂T_x MXene was systematically studied.Intercalation and oxidation effects of the Ti₃C₂T_x nanosheets were found to be greatly dependent on the solvents characteristics including the molecular size,oxidation capability and boiling point.As a result,the Ti₃C₂T_x MXene nanosheets obtained via DMF treatment were found to be relatively highly effective dielectric materials for electromagnetic wave absorption.2.The dependence of the properties of the MQDs and nanosheets on the different solvents including dimethylformamide?DMF?,ethanol,and dimethyl sulfoxide?DMSO?in ultrasonication–solvothermal treatment of bulk Ti₃C₂T_x MXene were studied systematically.White or blue emissions under 365 nm UV irradiation were obtained for the MQDs prepared in various solvents accordingly.The quantum yields?QYs?and average lateral sizes of the MQDs also showed great dependence on the solvents.Different MQDs can be chosen on-demand for versatile applications such as the MQDs prepared in DMF are favorable for label-free specific detection of ferric ion,while the ones in ethanol are much handier for fiber staining.3.Furthermore,layered Ti₃C₂ MXenes structure from exfoliation of Ti₃Al C₂ via HCl-Li F treatment was treated with ultrasonication for 180 min in order to delaminate the MXene flakes.Subsequently,hydroythermal treatment?120 ^oC,6 h?was used to produce the titanium dioxide doped carbon quantum dots titanium dioxide?TiO ₂/CQDs?.The as-prapared QDs exhibited band gap-depended catalytic properties can collect dissolved oxygen on the interface and reduce oxygen to ROS,which produced obviously ECL properties of the QDs.