Electronic structures and bonding properties of chlorine-treated nitrogenated carbon nanotubes: X-ray absorption and scanning photoelectron microscopy studies
Journal
Applied Physics Letters
Journal Volume
90
Journal Issue
19
Date Issued
2007
Author(s)
Ray S.C.
Pao C.W.
Tsai H.M.
Chiou J.W.
Pong W.F.
Chen C.W.
Tsai M.-H.
Papakonstantinou P.
Chen L.C.
Chen K.H.
Abstract
The electronic and bonding properties of nitrogenated carbon nanotubes (N-CNTs) exposed to chlorine plasma were investigated using C and N K-edge x-ray absorption near-edge structure (XANES) and scanning photoelectron microscopy (SPEM). The C and N K-edge XANES spectra of chlorine-treated N-CNTs consistently reveal the formation of pyridinelike N-CNTs by the observation of 1s→π*(e2u) antibonding and 1s→π*(b2g) bonding states. The valence-band photoemission spectra obtained from SPEM images indicate that chlorination of the nanotubes enhances the C–N bonding. First-principles calculations of the partial densities of states in conjunction with C K-edge XANES data identify the presence of C–Cl bonding in chlorine treated N-CNTs.
SDGs
Type
journal article