title: Synthesis and magnetic properties of Fe3C-C core-shell nanoparticles.
abstract: Fe3C-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 Fe3C 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 Fe3O4-Fe3C 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 Fe3C nanoclusters and the coalescence process of Fe3C-C nanoclusters. The Fe3C-C core-shell nanoparticles exhibited a saturation magnetization of 23.6 emu g(-1) and a coercivity of 550 Oe at room temperature.
authors: School of Physics and Electronics, State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People's Republic of China.
authors: Jun
authors: J
authors: Liu
authors: Bowen
authors: B
authors: Yu
authors: Qiankun
authors: Q
authors: Zhang
authors: Lizhen
authors: L
authors: Hou
authors: Qiulai
authors: Q
authors: Huang
authors: Chunrui
authors: C
authors: Song
authors: Shiliang
authors: S
authors: Wang
authors: Yueqin
authors: Y
authors: Wu
authors: Yuehui
authors: Y
authors: He
authors: Jin
authors: J
authors: Zou
authors: Han
authors: H
authors: Huang