|About this Abstract
||2011 TMS Annual Meeting & Exhibition
||Surfaces and Heterostructures at Nano- or Micro-Scale and Their Characterization, Properties, and Applications
||Induced Chemical Changes in Ni/NiO Core Shell-Carbon Nanotube Heterostructures in a High Temperature Post-Fabrication Treatment
||Hylton McWhinney, Wenwu Shi, Nitin Chopra
|On-Site Speaker (Planned)
High temperature surface migration of Ni/NiO core-shell nanoparticles (~5-10 nm) on the surface of carbon nanotubes (CNC Heterostructures, Shi, Krews, and Chopra, Materials Technology, 2010) was thoroughly studied. Heat treatments were carried out in a nitrogen-enriched furnace and the CNC heterostructures were carefully dispersed on a substrate. The samples were treated between 125 – 750 oC for 1 h. It was observed in SEM, TEM, and EDS analysis that nanoparticles significantly migrate on the CNT surfaces and their morphology was changed. In addition, massive agglomeration of nanoparticles was observed at higher annealing temperatures. XPS analysis of the heterostructures, as a function of their heat treatments, suggested that nanoparticle precursor solution, CNT surface, and annealing temperature played an important role in the morphological evolution of nanoparticles on CNTs. Shifts in the XPS elemental peaks revealed new critical information about the bonding characteristics of such heterostructures.
||Planned: A CD-only volume