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Issue 44, 2017
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Effect of precursor concentration on size evolution of iron oxide nanoparticles

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Abstract

Thermal decomposition is a promising route for the synthesis of magnetic nanoparticles. The simplicity of the synthesis method is counterbalanced by the complex chemistry of the system such as precursor decomposition and surfactant–reducing agent interactions. Control over nanoparticle size is achieved by adjusting the reaction parameters, namely, the precursor concentration. The results, however, are conflicting as both an increase and a decrease in nanoparticle size, as a function of increasing concentration, have been reported. Here, we address the issue of size-controlled synthesis via the precursor concentration. We synthesized iron oxide nanoparticles with sizes from 6 nm to 24 nm with narrow size distributions. We show that the size does not monotonically increase with increasing precursor concentration. After an initial increase, the size reaches a maximum and then shows a decrease with increasing precursor concentration. We argue that the observation of two different size regimes is closely related to the critical role of the amount of surfactant. We confirm the effect of surfactant amount on nucleation and growth and explain the observed trend. Furthermore, we show that the nanoparticles show size-dependent but superior superparamagnetic properties at room temperature.

Graphical abstract: Effect of precursor concentration on size evolution of iron oxide nanoparticles

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Publication details

The article was received on 01 Aug 2017, accepted on 16 Oct 2017 and first published on 16 Oct 2017


Article type: Paper
DOI: 10.1039/C7CE01406F
CrystEngComm, 2017,19, 6694-6702
  • Open access: Creative Commons BY license
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    Effect of precursor concentration on size evolution of iron oxide nanoparticles

    H. Sharifi Dehsari, A. Halda Ribeiro, B. Ersöz, W. Tremel, G. Jakob and K. Asadi, CrystEngComm, 2017, 19, 6694
    DOI: 10.1039/C7CE01406F

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