Thermal diffusivity of aligned multi-walled carbon nanotubes measured by the flash method

Jani Mäklin, Niina Halonen, Géza Toth, András Sápi, Ákos Kukovecz, Zoltán Kónya, Heli Jantunen, Jyri Pekka Mikkola, Krisztián Kordas

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Thermal diffusivity of freestanding catalytic chemical vapor deposition (CCVD) grown multi-walled carbon nanotube (MWCNT)forests (height of 1.5 and 1.9 mm)was characterized in the temperature range between 25 and 200 8C. Copper and Al-alloy metal blocks were used as references for validation of the experimental setup. The measurements were carried out along theMWCNTalignment direction with a thermal property analyzer that uses the flash method. The thermal diffusivities measured at room temperature for as-grown and post-annealed (2 h at 480 8C in open air) samples were found to be ~0.45 and ~0.23 cm2/s, respectively. In both cases, the thermal diffusivity values were slightly decreasing with increasing temperature. The observed decrease in diffusivity after annealing is most probably due to the loss of amorphous carbon in the specimens and also because of the increased defect density in the nanotube walls resulting in a more pronounced phonon scattering in the lattice. The measured thermal diffusivities for as-grown samples agree with data reported elsewhere for similar MWCNT materials.

Original languageEnglish
Pages (from-to)2508-2511
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Volume248
Issue number11
DOIs
Publication statusPublished - Nov 2011

Keywords

  • Carbon nanotubes
  • Flash method
  • Thermal analysis
  • Thermal diffusivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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