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Substituent effect of Fe(β-diketonate)3 on the control of self-assembly FePt-based nanoparticles

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Abstract

Three Fe(β-diketonate)3 compounds namely Fe(tmhd)3 (tmhd = 2,2,6,6-tetramethyl-3,5-heptanedionato), Fe(hfac)3 (hfac = hexafluoroacetylaceto), and Fe(dbm)3 (dbm = dibenzoylmethane) were used as substitutes to Fe(acac)3 (acac = acetyleacetonate) in the synthesis of FePt nanoparticles. The obtained superparamagnetic nanoparticles are 4–5 nm in diameter without showing a large size variation with substituent Fe(β-diketonate)3. The synchrotron X-ray absorption spectroscopy confirmed the energy dispersive spectroscopy that as-synthesized nanoparticles were composed of iron oxides and metallic FePt3 alloys. By employing Fe(hfac)3, the Fe fraction was reduced and the magnetization was modest. The use of Fe(dbm)3 as starting materials gave rise to densely packed FePt3/Fe2O3 heterodimers. The replacements of Fe(acac)3 by Fe(tmhd)3 led to the long-range order of nanoparticle assembly with the narrowest size distribution.

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Acknowledgments

This work is financially funded by the Industry/University Cooperative Research Center (I/UCRC) in HDD Component, the Faculty of Engineering, Khon Kaen University and National Electronics and Computer Technology Center, National Science and Technology Development Agency with the approval of Seagate Technology (Thailand). We are grateful to Prof. Dr. Thomas Randall Lee of University of Houston for his guidance and facility support. The characterization by XAS and TEM was accomplished with the assistance by the staff at Synchrotron Light Research Institute and Khon Kaen University, respectively.

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Authors and Affiliations

  1. Molecular Technology Research Unit, School of Science, Walailak University, Nakhon Si Thammarat, 80161, Thailand

    K. Chokprasombat, P. Harding, C. Sirisathitkul & W. Tangwatanakul

  2. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    S. Pinitsoontorn

  3. Department of Electrical and Computer Engineering, Faculty of Engineering, Naresuan University, Phitsanulok, 65000, Thailand

    P. Muneesawang

Authors
  1. K. Chokprasombat
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  2. P. Harding
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  3. C. Sirisathitkul
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  4. W. Tangwatanakul
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  5. S. Pinitsoontorn
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  6. P. Muneesawang
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Correspondence to C. Sirisathitkul.

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Chokprasombat, K., Harding, P., Sirisathitkul, C. et al. Substituent effect of Fe(β-diketonate)3 on the control of self-assembly FePt-based nanoparticles. J Nanopart Res 16, 2436 (2014). https://doi.org/10.1007/s11051-014-2436-9

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  • DOI: https://doi.org/10.1007/s11051-014-2436-9

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