Fig. 2: Characterization of the SWCNT/Gr/MoS2 flexible photodetector.

a SEM images of the flexible SWCNT/Gr/MoS2 photodetector. b AFM images of the flexible SWCNT/Gr/MoS2 photodetector. c TEM images of the flexible SWCNT/Gr/MoS2 photodetector stacked region. d Comparison of Raman spectra of the SWCNT/Gr/MoS2 double heterojunctions with those of the original MoS2 film. e Comparison of Raman spectra of the SWCNT/Gr/MoS2 double heterojunctions with the original graphene and SWCNT film. f XPS of SWCNT/Gr/MoS2 photodetector. g XPS of c. h XPS of Mo. i XPS of S