Title
Synthesis of water dispersed Fe 3O 4@ZnO composite nanoparticles by the polyol method
Date Issued
22 October 2012
Access level
metadata only access
Resource Type
conference paper
Author(s)
University of Puerto Rico
Abstract
Water-soluble Fe 3O 4@ZnO composite nanoparticles (NPs) were synthesized using a polyol route. The effects of the addition of the ZnO phase were evaluated by varying the Zn/Fe molar ratio in the 0.25-1.00 range as a function of the reaction time. X-ray diffractometry confirmed the formation of the magnetite and ZnO phases and suggested the possible formation of a composite structure. Also, using this method, pure magnetite and ZnO NPs were synthesized. The average crystallite sizes were estimated to 6.3 ± 0.3 nm and 8.6 ± 0.6 nm for magnetite and ZnO NPs, respectively. The samples were examined using transmission electron microscopy. Fourier transform infrared spectra indicated the presence of adsorbed species onto the solids surface, which may explain the good stability of the materials in water. Photoluminescence measurements at room temperature for pure ZnO nanoparticles exhibited the characteristic excitonic emission around 395 nm. Vibrating Sample Magnetometer measurements at room temperature evidenced the superparamagnetic behavior of magnetite nanocrystals, with a saturation magnetization of 60emu/g. The maximum magnetization ranged from 28 to 54emu/g for the composite NPs. Mössbauer spectroscopy measurements at room temperature showed evidence of evolving Fe-sites associated to superparamagnetic particles, as reflected on the coexistence of prominent doublet peaks and very weak sextet peaks. © 2012 Materials Research Society.
Start page
153
End page
158
Volume
1449
Language
English
OCDE Knowledge area
Nano-tecnología
Scopus EID
2-s2.0-84867553167
Source
Materials Research Society Symposium Proceedings
ISSN of the container
02729172
ISBN of the container
978-160511426-2
Conference
Materials Research Society Symposium Proceedings
Sponsor(s)
This material is based upon work supported by the National Science Foundation under Grant No. HRD 0833112 (CREST program at UPRM). References [1] Guannan Wang and Xingguang Su, Anal. 136, 1783, (2011). [2] P. Juzenas, et al., Adv. Drug. Deliv. Rev. 60, 1600, (2008). [3] Z. L. Wang, et al., Adv. Funct. Mater. 14, 943, (2004). [4] J. Zhou, et al., Adv. Mater. 18, 2434, (2006). [5] E. Çetinörgü and S. Goldsmith, J. Phys. D: Appl. Phys. 40, 5220 (2007). [6] Ü. Özgür, et al., J. Appl. Phys. 98, 5220, (2005). [7] T.K. Indira and P.K. Lakshmi, Int. J. Pharm. Sci. Nanotech. 3, 1035, (2010). [8] Wei Cai, et al., J. Colloid Interface Sci. 305,366, (2007) [9] E. V. Panfilova, et al., Colloid J. 74, 99, (2012) [10] B. D Cullity, in Elements of X-ray Diffractions, edited by Morris Cohen (Addison Wesley, MA, 1972), p. 102. [11] Jiaqi Wan, et al., Mater. Chem. Phys. 114, 30, (2009). [12] R. M. Cornell and U. Schwertmann, in The Iron Oxides, (Wiley, Weinheim, 2003), p.141. [13] T. Rajh, et al., J. Phys. Chem. B 106, 10543, (2002). [14] Junhua Zhao, et al., Am. Ceram. Soc. Bull. 94, 725, (2011). [15] Peng Zou, et al., J. Nanosci. Nanotechnol. 10,1992, (2010). [16] R. Y. Hong, et al., Mater. Res. Bull. 43, 2457, (2008).
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