Studies of multiwall carbon nanotubes using Raman spectroscopy and AFM
|M. Zdrojek 1, Wojtek Gebicki 1, C. Jastrzebski 1, T. Melin 2, A. Huczko 3|
1. Warsaw University of Technology, Faculty of Physics, Koszykowa 75, Warszawa 00-662, Poland
The rapid progress of interest in carbon nanotubes research started with a development of sensitive tools for their observation and characterization. Raman spectroscopy and atomic force microscopy (AFM) has been successfully applied for studying carbon nanotubes length and diameter, electronic type (metallic or semiconducting), and whether nanotubes are separated or in bundle. Due to the specific combination of strong van Hove singularities of the phonon density of states and Raman resonance effects it is possible to measure Raman scattering spectra of small bundle of carbon nanotubes or even of single nanotube. Recent progress in understanding of the Raman spectra of relatively simple single wall carbon nanotubes (SWNT) stimulate the further Raman studies of more complicated multiwall carbon nanotubes (MWNT). We present the preliminary results of Raman scattering measurements of multiwall carbon nanotubes. The studied nanotubes have been grown by electric arc method and chemical vapor deposition (CVD) method. The nanotubes have been carefully dissolved, separated and then characterized by AFM. The micro-Raman spectra of the objects are taken with different wavelength excitations and in the temperature range 4K - 300K. Basically the spectra are quite similar to the well known single wall carbon nanotube spectra. The major Raman bands of single wall nanotubes are found in the spectra. In particular the disorder effects are visible due to the pronounced D band at ~1350 cm-1. Metallic and semiconducting type of conductitivity is distinguished through an analysis of the G (LO) mode at ~1600 cm-1. All the results will be discussed and compared with the literature results.
Presentation: poster at E-MRS Fall Meeting 2003, Symposium F, by Cezariusz Jastrzebski
See On-line Journal of E-MRS Fall Meeting 2003
Submitted: 2003-05-27 23:16 Revised: 2009-06-08 12:55
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