Berlin 2005 – scientific programme
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O: Oberflächenphysik
O 39: Nanostrukturen IV
O 39.9: Talk
Tuesday, March 8, 2005, 12:45–13:00, TU EB420
Raman spectroscopy on double-walled carbon nanotubes — •Wencai Ren1,2, Feng Li1, Huihong Qian3, Hui Qian3, Thorsten Staedler2, Achim Hartschuh3, Xin Jiang2, and Hui-Ming Cheng1 — 1Institute of Metal Research,Chinese Academy of Sciences, Shenyang 110016, China — 2Chair of Surface and Materials Technology, University of Siegen, Siegen 57068, Germany — 3Department of Chemistry, University of Siegen, Siegen 57068, Germany.
Double-walled carbon nanotube (DWNT) provides a new platform for fundamental studies and nanodevice applications, due to their special double wall structure and one-dimensional (1D) character. In this work, we developed a sulfur-assisted floating catalytic decomposition method to directly synthesize DWNT bundles with high purity, narrow diameter distribution and good alignment. In a first step Raman spectra of DWNT bundles were studied. The results indicate that (1) the radial breathing mode (RBM) and G-band profiles can all be decomposed into two intrinsic independent single-walled carbon nanotube (SWNT) components constituting the DWNT, and (2) D-band and G’-band were composed of four well-resolved peaks, which are considered to originate from the curvature effect related to the tube diameter and relative atom stacking effect of the two constituent tubes.
In a second step, Raman measurements at a single nanotube level were carried out. The correlation between the Raman spectra of the individual nanotubes and their bundles will be discussed. All results indicate that DWNTs possess unique and characteristic Raman spectra different from other sp2 carbon materials.