Preparation and Characterization of Fe₃O₄@Au Nanoparticles Used as Precursor of Ferrofluids

Abstract:

The Fe3O4 magnetic nanoparticles were prepared through co-precipitation of Fe3+ and Fe2+ with ammonium hydroxide. The initially obtained Fe3O4 nanoparticles were then coated by gold in solution of chloroauric acid through connecting of 3-aminopropyropyl thriethoxysilane (3-APTES) and the obtained Fe3O4@Au nanoparticles were further characterized by X-ray photoelectron spectrum (XPS). During the process, the influences of chloroauric acid, reducing agent, coupling agent and nanoparticles of Fe3O4 were studied. The results showed that core-shell structure Fe3O4@Au particles have diameters of about 20nm in size synthesized from sodium citrate as reducing agent with 10.08 emu/g of saturation magnetization.

• Periodical: Advanced Materials Research (Volume 177)
• Pages: 415-417
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.177.415
• Online since: December 2010
• Authors: De Cai Li, Zhi Li Zhang, Shao Lan Zhang
• Keywords: Core-Shell Structure, Fe₃O₄@Au, Magnetic Nanoparticle

References

[1] D.C. Li: Theory and Application of Magnetic Fluids. Beijing: Science Press, (2003).

[2] B. Liu, D.P. Wang: Materials Review Vol. 21 (2007), p.185.

[3] H. Zhang, M.E. Meyerhoff: Anal Chem. Vol. 78 (2006), p.609.

[4] M.C. Daniel, D. Astruc: Chem. Rev. Vol. 104 (2004), p.293.

[5] Y.L. Cui: Science in China B Vol. 48 (2005), p.273.

[6] S.J. Cho, J.C. Idrobo, J. Olamit, et al.: Chem. Mater. Vol. 17 (2005), p.3181.

[7] S. -H. Kim, M. -J. Kim, Y. -H. Choa: Materials Science and Engineering A (2007), p.386.

[8] J. Kim, J.E. Lee, J. Lee, et al.: J. Am. Chem. Soc. Vol. 128 (2006), p.688.