Figure 2From: Electronic Structures of S-Doped Capped C-SWNT from First Principles StudyThe 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/ÅBack to article page