Size Controlling of L10-FePt Nanoparticles During High Temperature Annealing on the Surface of Carbon Nanotubes

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• 作者：R. Moradi ; S. A. Sebt ; H. Arabi
• 关键词：FePt nanoparticles ; Carbon nanotubes ; Nanocomposites ; Ordering parameter ; Superparamagnetic ; Ferromagnetic ; fcc and fct L10 structure
• 刊名：Journal of Inorganic and Organometallic Polymers and Materials
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：26
• 期：2
• 页码：344-352
• 全文大小：3,401 KB
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• 作者单位：R. Moradi (1)
  S. A. Sebt (2)
  H. Arabi (3)
  
  1. Department of Physics, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
  2. Department of Physics, Science and Research Branch, Islamic Azad University, P.O. Box 14665-678, Tehran, Iran
  3. Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Inorganic Chemistry
  Organic Chemistry
  Polymer Sciences
  
• 出版者：Springer New York
• ISSN：1574-1451

文摘

Mono-size FePt nanoparticles with particles size about 2.5 nm have been prepared by polyol method on the surface of carbon nanotubes (CNTs). The CNTs functinalization time and the mass ratio of nanoparticles to CNTs affects on the CNTs surface coating. The as-synthesis nanocomposites have a superparamagnetic behavior with chemically disordered fcc structure at room temperature and they can be transformed into chemically ordered fct structure after thermal annealing above 600 °C. Their magnetic behavior changes from the superparamagnetic to the ferromagnetic with a large coercivity up to 0.83 T for the nanocomposites which annealed at 800 °C. The CNTs surfaces as a substrate prevent the agglomeration of nanoparticles during high temperature annealing and the FePt nanoparticles after annealing at 800 °C have finite size with an average about 10 nm. The structure, composition and magnetic properties of nanocomposite were characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy and vibrating sample magnetometer.