Raman spectroscopic investigation of carbon nanowalls.
Two-dimensional carbon nanowalls (CNWs) were prepared by microwave plasma-enhanced chemical-vapor deposition and scanning electron microscopy was used to observe their morphologies. The Raman observations of different sample orientations and polarizations show that CNWs are well crystallized. Micro-Raman scattering measurements were also carried out with different excitation laser lines (325, 488, 514, 532, and 633 nm). The D band shows a very strong shift of 46.19 cm(-1)eV with excitation laser energy and this has been explained by the double resonance effect. The decreasing intensity ratios IDIG and ID'/IG with increasing laser excitation energy were detected and discussed.
Ni
Z H
ZH
Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
Fan
H M
HM
Feng
Y P
YP
Shen
Z X
ZX
Yang
B J
BJ
Wu
Y H
YH