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Structural evolution and stability studies of heterostructures comprised of carbon nanotubes decorated with nickel/nickel oxide core/shell nanoparticles

Structural evolution and stability studies of heterostructures comprised of carbon nanotubes decorated with nickel/nickel oxide core/shell nanoparticl

Structural evolution and stability studies of heterostructures comprised of carbon nanotubes decorated with nickel/nickel oxide core/shell nanoparticles  
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The single-step synthesis of heterostructures, denoted as CNC heterostructures, comprised of carbon nanotubes (CNTs) decorated with nickel (Ni)/nickel oxide (NiO) core/shell nanoparticles through a direct nucleation approach is reported. This approach allowed for a single-parameter and well-controlled structural evolution of Ni/NiO core/shell nanoparticles on CNTs. It was possible to control the size (∼12–52nm), shape, spatial density, and chemical composition of nanoparticles formed on CNTs by changing the nanoparticle growth time (15min to 15h). It was observed that growth time of 15h led to the reaction between phosphine-based stabilizers and Ni core forming solid and hollow Ni12P5 nanoparticles directly on CNTs. Thermal stability of CNC heterostructures (in N2-rich atmosphere) dispersed on a silicon wafer as well as subsequent surface migration of nanoparticles were studied by annealing heterostructures at different temperatures (125–750°C). In comparison to as-produced CNTs, the surface characteristics, oxidative resistance or thermal stability, and changes in heterostructure compositions were studied using electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The heterostructures showed greater oxidative resistance as compared to as-produced CNTs.
Journal: Carbon , vol. 49, no. 11, pp. 3645-3662, 2011
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