Stable Core Shell Co3Fe7鈥揅oFe2O4 Nanoparticles Synthesized via Flame Spray Pyrolysis Approach

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• 作者：Yunfeng Li ; Yanjie Hu ; Junchao Huo ; Hao Jiang ; Chunzhong Li ; Guangjian Huang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：August 29, 2012
• 年：2012
• 卷：51
• 期：34
• 页码：11157-11162
• 全文大小：325K
• 年卷期：v.51,no.34(August 29, 2012)
• ISSN：1520-5045

文摘

Air stable Co₃Fe₇鈥揅oFe₂O₄ nanoparticles have been synthesized via one-step flame spray pyrolysis of a mixture of Fe/Co precursor solution under stronger reducing atmosphere. The as-synthesized nanoparticles with diameters of 20鈥?0 nm showed a typical core shell structure and high stability for being one month in air, whose metallic Co₃Fe₇ cores were protected against oxidation by a surface shell of about 2鈥? nm cobalt iron oxide (CoFe₂O₄). The ratio of metallic Fe/Co alloy nanoparticles was 7:3. The alloy nanoparticles exhibited enhanced saturation magnetization (126.1 emu/g), compared with flame sprayed iron nanoparticles with the same conditions. The formation process of metallic alloy nanoparticles with core鈥搒hell structure was investigated, which included three stages: flame combustion, reducing, and surface oxidation during the flame process. It is reckoned that such a continuous production approach is an effective way to produce the stable Co₃Fe₇ alloy nanoparticles with high saturation magnetization.