X-ray absorption studies of carbon-related materials.
X-ray absorption near-edge structure (XANES) measurements have been performed on nitrogen-doped diamond films with three different dopant concentrations and iron-layer-stabilized carbon nanotube (CNT) structures with various diameters at the C K-absorption edge using the sample drain current mode. The C K-edge XANES spectra of these N-doped diamond films resemble that of the undoped diamond regardless of the dopant concentration, which suggest that the overall bonding configuration of the C atom is unaltered. N dopants are found to reduce the intensities of both the sp2- and sp3-bond-derived resonance features in the XANES spectra. On the other hand, the C K-edge XANES spectra of CNTs indicate that the intensities of the pi* and sigma* bands and the interlayer-state features vary with the diameter of the CNT. This phenomenon may be caused by the Fe-layer-catalysed bending of the graphite sheet and the interaction between C and Fe atoms.
Pong
W F
WF
Department of Physics, Tamkang University, Tamsui, Taiwan. wfpong@mail.tku.edu.tw
Yueh
C L
CL
Chang
Y D
YD
Tsai
M H
MH
Chang
Y K
YK
Chen
Y Y
YY
Lee
J F
JF
Wei
S L
SL
Wen
C Y
CY
Chen
L C
LC
Chen
K H
KH
Lin
I N
IN
Cheng
H F
HF