Fig. 3: Characterization of MoS2 nanotubes.
From: Symmetry-broken MoS2 nanotubes through sequential sulfurization of MoO2 nanowires
a Bright optical image of MoS2 nanotubes grown on SiO2/Si substrate. b SEM image shows that the MoS2 nanotubes have a large aspect ratio. c Violin plot of nanotube diameters (n = 80), with mean (54.5 ± 15.4 nm) and median (51.8 nm) indicated. d, e Raman intensity mapping for \({{{ E}}}_{{{2}}{\boldsymbol{g}}}^{{{1}}}\) (380 cm−1) and \({{{A}}}_{{{1}}{{g}}}\) (405 cm−1), respectively. f AFM image illustrating that pure MoS2 nanotubes can be obtained under appropriate H2 concentration ratios. g Structural characterization of multiwall MoS2 nanotubes. h Bright field TEM image of completely sulfurized MoS2 nanotube. i HAADF-STEM image of multiwall MoS2 nanotube. Inset: fast Fourier transform pattern in the central region of the nanotube. j, k Atomic resolution HAADF-STEM image of the area denoted by white dashed squares 1 and 2 in panel e, revealing the characteristic arrangement of the rhombohedral symmetry (3R) phase, this pattern is superimposed and aligned with the atomic structure model for detailed comparison. Scale bar: 40 μm in (a), 10 μm in (b), and 100 nm in the inset of (b), 1 μm in (d, e), 100 nm in (f), 20 nm in (h), 5 nm in (i), and 1 nm−1 in the inset of (i), 0.5 nm in (j, k). Source data are provided as a Source Data file.
