Fig. 2: Microscopy analysis of MoO2 nanowires.
From: Symmetry-broken MoS2 nanotubes through sequential sulfurization of MoO2 nanowires

a, b Optical and SEM images showing MoO2 nanowires grown on SiO2/Si substrate. Terminal particles attached to the nanowires are highlighted with circles. c HAADF-STEM image and corresponding EDS elemental mappings of a single MoO2 nanowire. d, e Atomic structure of tetragonal MoO2 (viewed from c-axis and a-axis). f Cross-sectional STEM image of Tetragonal MoO2 nanowires. The inset in (f) displays the corresponding fast Fourier transform pattern. g STEM image of tetragonal MoO2 from the (111) direction. The inset shows the corresponding FFT pattern. h Cross-sectional STEM image of the initial stage of the sulfidation process of MoO2 nanowires. i, j HAADF-STEM image of the initial stage of the sulfidation process from zone axis [113]. And a magnified view of the region denoted by a white dashed square shows the synthesized MoS2 stacked in a rhombohedral stacking manner. Scale bar: 10 μm in (a), 5 μm in (b), 50 nm in (c), 1 nm in (f, g), 5 nm−1 in insets of (f, g), 20 nm in (h), 10 nm in (i), 1 nm in (j).