Figure 2.

The workfunction of pristine and S-doped and N-doped C-SWNT with and without applied electric field. The abscissa denotes the doping layer, and the layer “zero” denotes pristine C-SWNT. The unit of electric field (E) is V/Å

Wang et al. Nanoscale Research Letters 2010 5:1027-1031   doi:10.1007/s11671-010-9594-1