Preparation And Characterization Of Ti₃C₂T_x/Au With SERS Properties

MXene is a kind of two dimension nanosheets material with graphene-like property,through etching main element away from MAX phase（M refers to transition metal element,A refers to main element,and X refers to carbon or nitrogen）to obtain MXene which with accordion-like structure.It was first synthesized in 2011 by the Jury Gogotsi team of Dresar University.Because of its good electrical conductivity and its layered structure,MXene has attracted wide attention in many fields such as energy,optics and catalysis.Surface-enhanced Raman spectroscopy（SERS）is a commonly used characterization method in recent years.Due to the small scattering cross section,the signal of Normal Raman Scattering（NRS）is weak,so it is difficult to meet high sensitivity applications.Surface-enhanced Raman scattering means that when some molecules are adsorbed into rough metal surfaces such as gold,silver,and copper,their Raman scattering intensity increases by 10⁴-10⁶ times.Through the improvement of the shortcomings of ordinary Raman scattering,SERS can be widely used in the detection fields of food,biology,medicine,etc.with high sensitivity requirements.In this paper,the preparation of Ti₃C₂T_X nanosheets and Ti₃C₂T_X/Au nanocomposites is studied in depth.The main research contents and conclusions are as follows:The in-situ etching method of fluoride salt was used to etch the MAX phase（titanium carbide Ti3AlC2 material）,and the Ti₃C₂T_X with two-dimensional ordered nanosheets structure was successfully prepared by ultrasonic,centrifugation,washing,suction filtration,drying,etc.series of physical processes.The optimum preparation conditions are a LiF/MAX mass ratio of 12:1 and HCl solution concentration of 9M.The Ti₃C₂T_X nanosheets prepared by the process optimization were used as the substrate material,and the Au nanoparticles were prepared by the reduction method.The Au nanoparticles were successfully loaded on the Ti₃C₂T_X nanosheets by magnetic stirring for a certain time.The effects of these three factors on Ti₃C₂T_X/Au nanocomposites were investigated by controlling the type of reducing agent,reaction time and temperature.