Figure 2From: Effect of sulfur on enhancing nitrogen-doping and magnetic properties of carbon nanotubes TEM images of as-grown CNTs at three different temperatures with and without S. (a) 980°C without S; (b-d) different temperatures with S: (b) 940°C, (c) 980°C, (d) 1020°C; (e-h) novel CNT structures with S: (e) bamboo-like CNTs, (f) twisted CNTs, (g) arborization-like CNTs, (h) bead-like CNTs.Back to article page