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Three types of carbon nano-onions (CNOs) including Ni@CNOs, Fe 3 C@CNOs and Fe 0.64 Ni 0.36 @CNOs nanoparticles have been synthesized by catalytic decomposition of methane at 850 °C using nickel, iron and iron-nickel alloy catalysts. Comparative and systematic studies have been carried out on the morphology, structural characteristics and graphitic crystallinity of these CNOs...
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