fig3

Figure 3. (A) (i) Schematic illustration of self-seeding solution-phase method^[68]; (ii) SEM image of Se nanowires; Copyright 2002, Wiley-VCH. (B) (i) Schematic of the plasma-assisted selenization process^[69]; (ii) A top view SEM image of Se nanowires and a magnified TEM image of single Se nanowire with the lattice spacings of 0.351 nm of (110) and 0.502 nm of (001); Copyright 2018, American Chemical Society. (C) (i) Schematic illustration of thermally drawn-assisted method^[70]; (ii) SEM image of Se nanowire arrays and inset is TEM image of a single nanowire with 32 nm thickness; (iii) Cross-sectional SEM micrograph of Se nanowires; Copyright 2011, Nature Publishing Group.