Figure 1.

Morphologies and structures of CNT arrays: a The assembled CNT array cathode on a copper stage, b The CCD image of the CNT array cathodes that are not emit, c Low-resolution TEM image of the CNTs, d High-resolution TEM image of the CNTs.

Liao et al. Nanoscale Res Lett 2011 6:40   doi:10.1007/s11671-010-9784-x