Figure 3.

TEM images of the samples: a carbon hollow spheres prepared at 400 °C; b carbon hollow capsules prepared at 480 °C; c carbon solid spheres prepared at 600 °C; d HRTEM image of the carbon hollow capsules prepared at 480 °C

Shi et al. Nanoscale Research Letters 2009 5:20-24   doi:10.1007/s11671-009-9436-1