Issue 7, 2013
From the journal:

Nanoscale

Non-monotonic size change of monodisperse Fe3O4nanoparticles in the scale-up synthesis†

Ning-Ning Song,a   Hai-Tao Yang,*a   Xiao Ren,a   Zi-An Li,b   Yi Luo,a   Jun Shen,c   Wen Dai,c   Xiang-Qun Zhanga  and  Zhao-Hua Cheng*a  

* Corresponding authors

a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China
E-mail: zhcheng@iphy.ac.cn, htyang@iphy.ac.cn
Fax: +86-10-82649485
Tel: +86-10-82648083

b Universität Duisburg-Essen, Fakultät für Physik, Duisburg 147057, Germany

c Key Laboratory of Cryogenics, TIPC, Chinese Academy of Sciences, Beijing 100190, P. R. China

Abstract

A non-monotonic size change of monodisperse Fe3O4 nanoparticles (NPs) with a diameter of 3–20 nm is observed in the scale-up organic-phase synthesis. The crystal structures and the valence state of the Fe ions of the as-prepared NPs were determined by X-ray diffraction (XRD) and Mössbauer spectroscopy, respectively. It is interestingly observed that particle size does not decrease monotonously with either the increase of the molar ratio of oleic acid (OA) to FeO·OH, or the decrease of precursor concentration. Furthermore, the reaction process was investigated via the time-dependent Fourier transform infrared spectra (FTIR) and the transmission electron microscopy (TEM) images, which reveal that the non-monotonic size change results from the different influence of OA on the three reaction stages including monomer formation, nucleation, and growth with increasing precursor amounts.

Graphical abstract: Non-monotonic size change of monodisperse Fe3O4 nanoparticles in the scale-up synthesis

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Article information

DOI
https://doi.org/10.1039/C3NR33950E
Article type
Paper
Submitted
05 Dec 2012
Accepted
12 Jan 2013
First published
18 Jan 2013

Nanoscale, 2013,5, 2804-2810

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Non-monotonic size change of monodisperse Fe3O4 nanoparticles in the scale-up synthesis

N. Song, H. Yang, X. Ren, Z. Li, Y. Luo, J. Shen, W. Dai, X. Zhang and Z. Cheng, Nanoscale, 2013, 5, 2804 DOI: 10.1039/C3NR33950E

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