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Improving the wettability of aluminum on carbon nanotubes

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
59
Issue
9
Identifiers
DOI: 10.1016/j.actamat.2011.01.061
Keywords
  • Carbon Nanotubes
  • Aluminum
  • Electroplating
  • Interface
  • Nanocomposite

Abstract

Abstract The wetting of a metal on carbon nanotubes is fundamentally difficult due to the unusually large difference between their surface tensions and is a bottleneck for making metal–carbon nanotube (CNT) composites. Here, we report a simple method to enhance the wettability of metal particles on the CNT surface by applying aluminum, which is the material with the largest surface tension. This method involves two steps: (i) Al nanoparticles are decorated on multiwalled carbon nanotubes by electroplating and (ii) Al powder is further spread on Al-electroplated CNTs, followed by high-temperature annealing to accommodate complete wetting of the aluminum. The large surface tension difference is overcome by forming strong Al C covalent bonds initiated by defects of the CNTs. The decrease in the D-band intensity, the G-band shift in the Raman spectroscopy and the formation of Al C covalent bonds, as confirmed by X-ray photoelectron spectroscopy, were in agreement with our structural model of CNT vacancy O Al determined by density functional calculations.

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