title: Raman spectroscopic investigation of carbon nanowalls.
abstract: 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.
authors.affiliation: Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Ni
authors.forename: H M
authors.initials: HM
authors.lastname: Fan
authors.forename: Y P
authors.initials: YP
authors.lastname: Feng
authors.forename: Z X
authors.initials: ZX
authors.lastname: Shen
authors.forename: B J
authors.initials: BJ
authors.lastname: Yang
authors.forename: Y H
authors.initials: YH
authors.lastname: Wu