Controllable preparation of tungsten/tungsten carbide nanowires or nanodots in nanostructured carbon with hollow macroporous core/mesoporous shell
FESEM images of the obtained nano-sized tungsten and their corresponding TEM images (insert). Panels (a) and (b) show the images of tungsten reduced through 0.1 sccm and 70 °C/min procedure; panels (c) and (d) indicate the images of tungsten obtained from 0.3 sccm and 5 °C/min reduction process; panels (e) and (f) present the images of tungsten obtained under 0.1 sccm and 5 °C/min conditions.
