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Controllable synthesis and magnetic properties of Fe–Co alloy nanoparticles attached on carbon nanotubes

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Abstract

Fe–Co alloy nanoparticles with different size were attached on the carbon nanotubes through adjusting the ratio of the metal to carbon in the mixed solution of nitrate with Fe:Co = 1:1 (molar ratio) via wet chemistry. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectrometry (EDX) indicated that the Fe–Co alloy nanoparticles attached on the surface of carbon nanotubes has body-centered cubic (bcc) structure, with sizes in the range of 13–25 nm and in the shape of spheroids. Magnetization measurements indicated that both the coercivities and the saturation magnetizations altered with size changes of the Fe–Co alloy nanoparticles. The saturation magnetization decreases with decreasing the Fe–Co alloy nanoparticles’ sizes. A decrease in coercivity with increasing Fe–Co size together with a local maximum coercivity at size of ca. 15 nm is visible. A linear relationship between the inverse particle diameter and the coercivity was found for larger particles. These demonstrated that the chemical method here is promising for fabricating Fe–Co alloy nanoparticles coated on carbon nanotubes for magnetic storage applications.

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Acknowledgements

We thank Anhui Provincial Excellent Young Scholars Foundation (No. 04046065), the Education Department (Nos. 2003KJ140, 2001KJ115ZD) of Anhui Province, the State Education Ministry (EYTP, SRF for ROCS) and National Natural Science Foundation (Nos. 20271002, 20490210) of P. R. China for financial support.

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Authors and Affiliations

  1. College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu, 241000, P. R. China

    Hua-Qiang Wu, Pin-Shi Yuan, Hong-Yan Xu, Dong-Mei Xu, Bao-You Geng & Xian-Wen Wei

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  1. Hua-Qiang Wu
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  2. Pin-Shi Yuan
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  3. Hong-Yan Xu
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Correspondence to Hua-Qiang Wu or Xian-Wen Wei.

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Wu, HQ., Yuan, PS., Xu, HY. et al. Controllable synthesis and magnetic properties of Fe–Co alloy nanoparticles attached on carbon nanotubes. J Mater Sci 41, 6889–6894 (2006). https://doi.org/10.1007/s10853-006-0935-5

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