Sains Malaysiana 43(6)(2014): 941–945

Synthesis of Iron Oxide (Fe₃O₄) Magnetic Nanocrystals by Green Chemistry Approach

(Sintesis Nanohablur Magnet Ferum Oksida (Fe₃O₄) dengan Pendekatan Kimia Hijau)

W.S. Chiu¹*, S.X. Too¹, S.N.H. Daud¹, N.M.A. Rashid¹, M.Y. Chia¹, S.A. Rahman¹, A. Suhaimi Bakar¹, Z. Aspanut¹, P.S. Khiew², T.K. Tan², S. Radiman³, R. Abd-Shukor³, M.A.A. Hamid³& C.H. Chia³

1Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University Malaya, 50603 Lembah Pantai, Kuala Lumpur, Malaysia

2Faculty of Engineering, University of Nottingham Malaysia Campus, 43500 Semenyih, Selangor, Malaysia

3School of Applied Physics, Faculty of Science & Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Diserahkan: 3 Mei 2013/Diterima: 15 Disember 2013

ABSTRACT

In the present study, we report the size distribution study on the iron oxide (Fe₃O₄) magnetic nanocrystals (NCs), which have been synthesized by using green chemistry approach with palm-oil based carboxylic compound (oleic acid) as capping ligands. The Fe₃O₄ NCs were prepared by one pot reaction under non-hydrolytic approach. With the assistance of oleic acid that plays the role as effective capping-ligands, we showed that the Fe₃O₄ NCs that are highly monodispersed in size and shape can be synthesized by scrupulously controlling the reaction time. The diameter of Fe₃O₄ NCs can be tuned within the range of 4.0-18.0 nm and exhibit very uniform morphology, which are spherical in shape. Current synthetic approach offers a cheap, environmentally benign and excellent repeatability route in large-scale production of high-quality magnetic Fe₃O₄ NCs if compared to the preceding reports.

Keywords: Fe₃O₄; iron oxide; magnetic; nanocrystals; synthesis

ABSTRAK

Dalam penyelidikan ini, kami mengkaji taburan saiz ferum oksida (Fe₃O₄) nanohablur (NH) magnet yang disintesis dengan pendekatan kimia hijau dengan minyak kelapa sawit daripada kumpulan karboksilik (asid oleik) sebagai ligan. Fe₃O₄ NH disediakan dengan menggunakan tindak balas tunggal dalam keadaan tanpa akueus. Dengan adanya asid oleik yang berperanan sebagai ligan berkesan, kami menunjukkan bahawa Fe₃O₄ NH yang mempunyai saiz dan bentuk sekata dapat disediakan dengan mengawal tempoh masa tindak balas. Diameter Fe₃O₄ dapat dikawal dalam julat 4.0-18.0 nm dan menunjukkan morfologi saiz yang sekata, iaitu berbentuk sfera. Pendekatan sintesis ini telah menyediakan satu cara yang murah, mesra-alam dan kebolehulangan untuk penghasilan Fe₃O₄ NH magnet yang berkualiti tinggi secara besar-besaran berbanding laporan sebelum ini.

Kata kunci: Ferum oksida; Fe₃O₄; magnet; nanohablur;  sintesis

RUJUKAN

Chiu, W.S., Khiew, P.S., Cloke, M., Isa, D., Tan, T.K., Radiman, S., Abd-Shukor, R., Hamid, M.A.A., Huang, N.M., Lim, H.N. & Chia, C.H.   2010.   Photocatalytic study of two-dimensional Zno nanopellets in the decomposition of methylene Blue.  Chemical Engineering Journal  158: 345-352.

Chiu, W.S., Khiew, P.S., Isa, D., Cloke, M., Radiman, S., Abd-Shukor, R., Abdullah, M.H. & Huang, N.M.   2008.   Synthesis of two-dimensional Zno nanopellets by pyrolysis of zinc oleate.  Chemical Engineering Journal  142(3): 337-343.

Chiu, W.S., Radiman, S., Abdullah, M.H., Khiew, P.S., Huang, N.M. & Abd-Shukor, R. 2007.   One pot synthesis of monodisperse Fe₃O₄ nanocrystals by pyrolysis reaction of organometallic compound.  Materials Chemistry and Physics 106(2-3): 231-235.

Jana, N.R., Chen, Y.F. & Peng, X.G.   2004.   Size- and shape-controlled magnetic (Cr, Mn, Fe, Co, Ni) oxide nanocrystals via a simple and general approach.  Chemistry of Materials  16(20): 3931-3935.

Murray, C.B., Kagan, C.R. & Bawendi, M.G.   2000.   Synthesis and characterization of monodisperse nanocrystals and close-packed nanocrystal assemblies.  Annual Review of Materials Science  30: 545-610.

Murray, C.B., Norris, D.J. & Bawendi, M.G.   1993.   Synthesis and characterization of nearly monodisperse Cde (E = Sulfur, Selenium, Tellurium) semiconductor nanocrystallites.  Journal of the American Chemical Society  115(19): 8706-8715.

Peng, X.G., Wickham, J. & Alivisatos, A.P.   1998.   Kinetics of Ii-Vi and Iii-V colloidal semiconductor nanocrystal growth: ‘Focusing’ of size distributions.  Journal of the American Chemical Society 120(21): 5343-5344.

Reiss, H. 1951.   The growth of uniform colloidal dispersions.  Journal of Chemical Physics  19(4): 482-487.

Sugimoto, T. 1987.   Preparation of monodispersed colloidal particles.  Advances in Colloid and Interface Science 28: 65-108.

Yu, W.W. & Peng, X.G.   2002.   Formation of high-quality Cds and other Ii-Vi semiconductor nanocrystals in noncoordinating solvents: Tunable reactivity of monomers.  Angewandte Chemie-International Edition 41(13): 2368-2371.

*Pengarang untuk surat-menyurat; email: w.s.chiu@um.edu.my