Ag/Ti3C2Tx吸波性能研究OA

Although MXene materials(such as Ti3C2Tx)have the advantages of high dielectric loss and layered structure,their single component can easily lead to high electromagnetic wave re-flectivity and limited absorption efficiency.The purpose of this study was to control the absorp-tion performance of Ti3C2Tx nanosheets doped with Ag particles before and after peeling.Meth-ods Ti3AlC2 was selected as a typical MXene precursor,the MXene material was obtained by etch-ing Ti3AlC2 by LiF,the few-layer Ti3C2Tx nanosheets were obtained by ultrasonic centrifugation,and the Ag particles were doped by electroless plating.X-ray diffraction was used to analyze the phase composition of Ag@Ti3C2Tx nanosheets.Scanning electron microscopy and projection elec-tron microscopy were used to analyze the morphology of Ag@Ti3C2Tx nanosheets.The electro-magnetic parameters of the X-band of the Ag@Ti3C2Tx nanosheets and paraffin composites were measured by vector network analyzer,the loss sources of the composites were analyzed by Cole-Cole diagram,and the absorption properties of the Ag@Ti3C2Tx nanosheets were analyzed by e-lectromagnetic parameters.It is found from different silver plating contents,that the 60%Ag@Ti3C2Tx have excellent absorbing performance when the doped Ag@Ti3C2Tx with the same mass fraction is mixed with paraffin,and the dielectric solid/imaginary part of the Ag@Ti3C2Tx nanosheet/paraffin composite increase with the higher of Ag particle content,and the enhance-ment of polarization is the main reason for the increase of the dielectric solid/imaginary part of the composite,and the Cole-Cole diagram analysis show that there are many types of losses in the composites.They are conductive loss and relaxation polarization loss.When the Ag content is 60%,the absorption performance is the best,and when the thickness is 4.5 mm,the lowest re-flection loss is-35.7 dB at 10.53 GHz,and the effective absorption bandwidth is 2.86 GHz(9.54～12.40 GHz)Conclusion Ag@Ti3C2Tx nanosheet/paraffin composites exhibit excellent ab-sorption performance.The absorption performance of Ag@Ti3C2Tx nanosheets can be controlled.