Fig. 2

a The typical SEM image of the Ti₃C₂T_x film. Cross-sectional SEM image of cross section of alternate-layered MXene composite films with Nb₂CT_x contents: b 5 wt%, c 10 wt% d 15 wt%, e 20 wt%, f 25 wt%. h EDS mapping data of 15 wt% alternate-layered MXene film. j XRD patterns of the alternate-layered MXene composite nanosheet films. k Raman spectra of the Ti₃C₂T_x and alternate-layered MXene composite nanosheet films with various ratios