Chemical Physics Letters, Vol.513, No.1-3, 88-93, 2011
Thermal stability of functionalized carbon nanotubes studied by in situ transmission electron microscopy
The thermal stability of functionalized carbon nanotubes (CNTs) has been studied experimentally by direct in situ observations using a heating stage in a transmission electron microscope, from room temperature (RT) to about 1000 degrees C. It was found that the thermal stability of the functionalized CNTs was significantly reduced during the in situ heating process. Their average diameter dramatically expanded from RT to about 500 degrees C, and then tended to be stable until about 1000 degrees C. The X-ray energy dispersive spectroscopy analysis suggested that the diameter expansion was associated with coalescence of the carbon structure instead of deposition with additional foreign elements during the heating process. (C) 2011 Elsevier B. V. All rights reserved.