Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
Volume 12, Issue 4, Pages -Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1088/1468-6996/12/4/044605
Keywords
carbon nanotube; tungsten particle; thermal stability; thermodynamics; in-situ measurement
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Funding
- International Center for Materials Nanoarchitectonics (MANA) of the National Institute for Materials Science (NIMS)
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The thermal stability of multiwalled carbon nanotubes (CNTs) was studied in high vacuum using tungsten nanoparticles as miniaturized thermal probes. The particles were placed on CNTs inside a high-resolution transmission electron microscope equipped with a scanning tunneling microscope unit. The setup allowed manipulating individual nanoparticles and heating individual CNTs by applying current to them. CNTs were found to withstand high temperatures, up to the melting point of 60-nm-diameter W particles (similar to 3400 K). The dynamics of W particles on a hot CNT, including particle crystallization, quasimelting, melting, sublimation and intradiffusion, were observed in real time and recorded as a video. Graphite layers reel off CNTs when melted or premelted W particles revolve along the tube axis.
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