Tuesday, February 03, 2015

Synthesis and magnetic properties of Fe 3 C–C core–shell nanoparticles

Fe 3 C–C core–shell nanoparticles were fabricated on a large scale by metal-organic chemical vapor deposition at 700 °C with ferric acetylacetonate as the precursor. Analysis results of x-ray diffraction, transmission electron microscope and Raman spectroscope showed that the Fe 3 C cores with an average diameter of ∼35 nm were capsulated by the graphite-like C layers with the thickness of 2–5 nm. The comparative experiments revealed that considerable Fe 3 O 4 –Fe 3 C core–shell nanoparticles and C nanotubes were generated simultaneously at 600 and 800 °C, respectively. A formation mechanism was proposed for the as-synthesized core–shell nanostructures, based on the temperature-dependent catalytic activity of Fe 3 C nanoclusters and the coalescence process of Fe 3 C–C nanoclusters. The Fe 3 C–C core–shell nanoparticles exhibited a saturation magnetization of 23.6 emu g −1 and a coercivity of 550 Oe ...

Jun Liu, Bowen Yu, Qiankun Zhang, Lizhen Hou, Qiulai Huang, Chunrui Song, Shiliang Wang, Yueqin Wu, Yuehui He, Jin Zou and Han Huang

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