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Journal of Materials Science

, Volume 45, Issue 3, pp 783–792 | Cite as

Calibration of reaction parameters for the improvement of thermal stability and crystalline quality of multi-walled carbon nanotubes

  • Saveria SantangeloEmail author
  • Giacomo Messina
  • Giuliana Faggio
  • Maurizio Lanza
  • Alessandro Pistone
  • Candida Milone
Article

Abstract

The results of Raman analysis on multi-walled carbon nanotubes, prepared by catalysed chemical vapour deposition, are used as a guide for the calibration of the growth parameters, directed to improve crystalline quality and resulting thermal stability of nanotubes. Under selective growth conditions, the resistance to oxidation in air, as assessed by thermogravimetry measurements, is found to increase with the establishment of the long-range graphitic order in radial tube direction, as signalled by the Raman G′/G intensity ratio enhancement. In the range of parameters explored (synthesis temperature: 500–700 °C; growth atmosphere: 120 cc/min i-C4H10–H2–He mixture with He at 0–25%; i-C4H10/H2 flow ratio: 1–3; metal load and reduction temperature of Fe/Al2O3 catalysts: 17–40 wt%, and 500 and 700 °C, respectively), the best crystalline quality and the highest oxidative resistance are achieved by carrying out the synthesis reaction at 700 °C in 1:1:0 i-C4H10–H2–He atmosphere over 29 wt% Fe catalysts reduced at 700 °C. An additional relevant finding is the strong correlation evidenced between results of thermogravimetry and Raman analyses, suggesting the use of Raman spectroscopy for non-destructively evaluating the thermal stability of any graphitically ordered carbon species.

Keywords

Synthesis Temperature Crystalline Quality Metal Load Raman Spectroscopy MWCNT Content 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Saveria Santangelo
    • 1
    Email author
  • Giacomo Messina
    • 1
  • Giuliana Faggio
    • 1
  • Maurizio Lanza
    • 2
  • Alessandro Pistone
    • 3
  • Candida Milone
    • 3
  1. 1.Dipartimento di Meccanica e Materiali, Facoltà di IngegneriaUniversità “Mediterranea”Feo di Vito, Reggio CalabriaItaly
  2. 2.C.N.R., Istituto per i Processi Chimico-Fisici Sez. MessinaFaro Superiore, MessinaItaly
  3. 3.Dipartimento di Chimica Industriale e Ingegneria dei Materiali, Facoltà di IngegneriaUniversità di MessinaMessinaItaly

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