Surfactant-assisted synthesis and magnetic properties of monodispersed manganese ferrite nanocrystals

Abstract

Monodispersed manganese ferrite (MnFe₂O₄) nanocrystals could be successfully synthesized in large quantities via a facile synthetic technique based on the pyrolysis of organometallic compound precursor, in which octadecene was used as solvent, and oleic acid and oleylamine were used as capping ligands. MnFe₂O₄ nanocrystals were obtained with size in a tunable range of 4–15 nm and their morphologies could be tuned from spherical to triangle-shaped by varying the surfactants. The phase structure, morphology, and size of the products were characterized in detail by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Magnetic properties of MnFe₂O₄ nanocrystals with different morphologies were measured using a superconducting quantum interference device (SQUID). Both monodisperse MnFe₂O₄ nanocrystals with spherical and triangle-shapes are superparamagnetic at room temperature while ferromagnetic at 2 K. The pyrolysis method may provide an effective route to synthesize other spinel ferrites or metal oxides nanocrystals.

Keywords

pyrolysis / monodisperse nanocrystal / manganese ferrite / magnetic properties

References

[1] RajK., MoskowitzR.. Commercial applications of ferrofluids [J]. J Magn Magn Mater, 1990, 85(1/2/3): 233-235

[2] HyeonT.. Chemical synthesis of magnetic nanoparticle [J]. Chem Commun, 2003, 8: 927-934

[3] XuC.-j., SunS.-heng.. Monodisperse magnetic nanoparticles for biomedical applications [J]. Polym Int, 2007, 56(7): 821-826

[4] GhoshM., BiswasK., SundaresanA., RaoC. N. R.. MnO and NiO nanoparticles: Synthesis and magnetic properties [J]. J Mater Chem, 2006, 16(1): 106-111

[5] SunS.-h., MurrayC. B., WellerD., FolksL., MoserA.. Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices [J]. Science, 2000, 287(5460): 1989-1992

[6] LiY., AfzaalM., O’BrienP.. The synthesis of amine-capped nagnetic (Fe,Mn,Co,Ni) oxide nanocrystals and their surface modification for aqueous dispersibility [J]. J Mater Chem, 2006, 16(22): 2175-2180

[7] JanaN. R., ChenY.-f., PengX.-gang.. Size- and shape-controlled magnetic (Cr,Mn,Fe,Co,Ni) oxide nanocrystals via a simple and general approach [J]. Chem Mater, 2004, 16(20): 3931-3935

[8] SunS.-h., ZengH.. Size-controlled synthesis of magnetite nanoparticles [J]. J Am Chem Soc, 2002, 124(28): 8204-8205

[9] SeoW. S., JoH. H., LeeK., KimB., OhS. J., ParkJ. T.. Size-dependent magnetic properties of colloidal Mn3O4 and MnO nanoparticles [J]. Angew Chem Int Ed, 2004, 43(9): 1115-1117

[10] YuW. W., FalknerJ. C., YavuzC. T., ColvinV. L.. Synthesis of monodisperse iron oxide nanocrystals by thermal decomposition of iron carboxylate salts [J]. Chem Commun, 2004, 20: 2306-2307

[11] ShiR.-R., GaoG.-H., YiR., ZhouK.-C., QiuG.-Z., LiuX.-He.. Controlled synthesis and characterization of monodisperse Fe₃O₄ nanoparticles [J]. Chin J Chem, 2009, 27(4): 739-744

[12] CrouseC. A., BarronA. R.. Reagent control over the size, uniformity, and composition of Co-Fe-O nanoparticles [J]. J Mater Chem, 2008, 18(35): 4146-4153

[13] XieJ., PengS., BrowerN., PourmandN., WangS. X., SunS.-Heng.. One-pot synthesis of monodisperse iron oxide nanoparticles for potential biomedical applications [J]. Pure Appl Chem, 2006, 78(5): 1003-1014

[14] KangE., ParkJ., HwangY., KangM., ParkJ. G., HyeonT.. Direct synthesis of highly crystalline and monodisperse manganese ferrite nanocrystals [J]. J Phys Chem B, 2004, 108(37): 13932-13935

[15] ZengH., RiceP. M., WangS. X., SunS.-heng.. Shape-controlled synthesis and shape-induced texture of MnFe2O4 nanoparticles [J]. J Am Chem Soc, 2004, 126(37): 11458-11459

[16] AdireddyS., LinC.-k., PalshinV., DongY.-m., ColeR., CaruntuG.. Size-controlled synthesis of quasi-monodisperse transition-metal ferrite nanocrystals in fatty alcohol solutions [J]. J Phys Chem C, 2009, 113(49): 20800-20811

[17] ShiR.-r., LiuX.-h., GaoG.-h., YiR., QiuG.-zhou.. Large-scale synthesis and characterization of monodisperse Fe₃O₄ nanocrystals [J]. J Alloys Compd, 2009, 485(1/2): 548-553

[18] LamerV. K., DinegarR. H.. Theory, production and mechanism of formation of monodisperse hydrosols [J]. J Am Chem Soc, 1950, 72(11): 4847-4854

[19] PengZ. A., PengX.-gang.. Nearly monodisperse and shape-controlled CdSe nanocrystals via alternative routes: nucleation and growth [J]. J Am Chem Soc, 2002, 124(13): 3343-3353

[20] TalapinD. V., RogachA. L., KornowskiA., HaaseM., WellerH.. Highly luminescent monodisperse CdSe and CdSe/ZnS nanocrystals synthesized in a hexadecylamine-trioctylphosphine oxide-trioctylphospine mixture [J]. Nano Lett, 2001, 1(4): 207-211

[21] HambrockJ., BeckerR., BirknerA., WeibJ., FischerR. A.. A non-aqueous organometallic route to highly monodispersed copper nanoparticles using [Cu(OCH(Me)CH₂NMe₂)₂] [J]. Chem Commun, 2002, 1: 68-69

[22] JanaN. R., PengX.-gang.. Single-phase and gram-scale route toward nearly monodisperse Au and other noble metal nanocrystals [J]. J Am Chem Soc, 2003, 125(47): 14280-14281

[23] JunY., ChoiJ., JinwooC.. Shape control of semiconductor and metal oxide nanocrystals through nonhydrolytic colloidal routes [J]. Angew Chem Int Ed, 2006, 45(21): 3414-3439

[24] ZhangL., HeR., GuH.-Chen.. Oleic acid coating on the monodisperse magnetic nanoparticles [J]. Appl Surf Sci, 2006, 253(5): 2611-2617