Synthesis and magnetic properties of Fe_3O_4/helical carbon nanofiber nanocomposites from the catalytic pyrolysis of ferrocene

• 来源期刊: 科学通报(英文版)
• 学科: 化学
• 年，卷（期）: 2011,（30）
• 页码范围: 3199-3203
• 页数: 5页
• 分类号: O643.36
• 语种: 中文

摘要

High purity Fe3O4 /helical carbon nanofiber composites were obtained on a large scale by the catalytic pyrolysis of ferrocene in the presence of tin powder at 500°C over 12 h. The sizes of Fe 3 O 4 nanoparticles are 35–65 nm in size, and the diameters of the helical carbon nanofibers range from 40–70 nm. The shapes and compositions of the nanocomposites are simply controlled by adjusting the reaction temperatures. On the basis of the obtained experimental results the formation of the helical Fe3O4/carbon nanofiber composites was investigated and discussed. The magnetic hysteresis loop of the products shows ferromagnetic behavior with saturation magnetization (M s ), remanent magnetization (M r ) and coercivity (H c ) values of ca. 29.8 emu/g, 9.6 emu/g and 306.6 Oe, respectively.