Thermal stability evolution of carbon nanotubes caused by liquid oxidation

Sanja Ratkovic, Niculina Peica, Christian Thomsen, Dragomir B. Bukur, Goran Boskovic

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Carbon nanotubes (CNTs) grown by chemical vapor decomposition of ethylene on alumina- and silica-supported Fe-Co bimetallic catalysts were examined before and after purification encompassing chemical oxidation treatment in 3 M NaOH and 3 M HNO3 solutions, sequentially. Thermal properties were investigated and correlated with structural changes followed by TEM, X-ray diffraction and Raman spectroscopy characterization. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) were employed simultaneously in the regime of TPO and TPH, in diluted flow of either O 2 or H2. TG revealed almost complete burning of both refined CNT samples in diluted O2, indicating the efficiency of the purification method used to remove the catalyst remains. However, different trends and significant magnitudes of changes in the heat of combustion demonstrate changes in CNTs stability after purification as a function of the catalyst support type. This is the consequence of changes in carbon type, CNTs order degree and morphology, as well as the degree of functionalization, which have their own effects on the CNTs thermal stability.

Original languageEnglish
Pages (from-to)1477-1486
Number of pages10
JournalJournal of Thermal Analysis and Calorimetry
Volume115
Issue number2
DOIs
Publication statusPublished - Feb 2014

Fingerprint

Carbon Nanotubes
Thermodynamic stability
thermal stability
carbon nanotubes
Oxidation
oxidation
purification
Liquids
Purification
liquids
catalysts
Thermogravimetric analysis
heat of combustion
Catalysts
Aluminum Oxide
Catalyst supports
Silicon Dioxide
Raman spectroscopy
Differential scanning calorimetry
ethylene

Keywords

  • Carbon nanotubes morphology
  • Different catalyst supports
  • Liquid oxidation
  • Multi-walled carbon nanotubes
  • Thermal stability evolution

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Thermal stability evolution of carbon nanotubes caused by liquid oxidation. / Ratkovic, Sanja; Peica, Niculina; Thomsen, Christian; Bukur, Dragomir B.; Boskovic, Goran.

In: Journal of Thermal Analysis and Calorimetry, Vol. 115, No. 2, 02.2014, p. 1477-1486.

Research output: Contribution to journalArticle

Ratkovic, Sanja ; Peica, Niculina ; Thomsen, Christian ; Bukur, Dragomir B. ; Boskovic, Goran. / Thermal stability evolution of carbon nanotubes caused by liquid oxidation. In: Journal of Thermal Analysis and Calorimetry. 2014 ; Vol. 115, No. 2. pp. 1477-1486.
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