Synthesis of Monodispersed γ-Fe2O3 Nanoparticles Using Ferrocene as a Novel Precursor
Synthesis of Monodispersed γ-Fe2O3 Nanoparticles Using Ferrocene as a Novel Precursor
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DOI：
10.1166/jnn.2009.1113
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发表时间：
2009-09-01
影响因子：
--
通讯作者：
Srivastava, A. K.
中科院分区：
文献类型：
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作者：
Bhalerao, G. M.;Sinha, A. K.;Srivastava, A. K.
本文报道了以二茂铁为前驱体合成单分散的γ-Fe 2 O3纳米晶。以石蜡为溶剂，油酸为表面活性剂，研究了二茂铁的热分解反应。在热分解方法中常规使用的前体是五羰基铁。五羰基铁的毒性、挥发性和易燃性是环境和安全问题的根源。在目前的工作中提出的方法是更好的，在这些计数。此外，与五羰基铁相比，二茂铁分解所需的高温确保了生长的纳米颗粒的更好的结晶度。此外，石蜡中的反应可以突然冻结，以研究纳米颗粒的演变。纳米粒子，从而合成，其特征在于使用透射电子显微镜（TEM），高分辨率TEM（HRTEM）和光电子能谱（PES）。PES显示铁氧化物的形成，电子衍射显示颗粒是结晶的，并形成γ-Fe 2 O3相。TEM显示纳米颗粒在直径上是单分散的（20 +/-2nm），并且由于直径的高度均匀性，它们在三维六方密堆积超晶格中自组装。
We report synthesis of mono-dispersed nanoparticles of crystalline gamma-Fe2O3 using ferrocene as a novel precursor. Thermal decomposition of ferrocene was achieved using paraffin wax as solvent and oleic acid as surfactant. Conventionally used precursor in the thermal decomposition method is iron pentacarbonyl. The toxicity, volatility and flammability of iron pentacarbonyl are causes of concern for environment and safety. The method proposed in the present work is better in these counts. In addition, high temperature required for the decomposition of ferrocene compared to iron pentacarbonyl ensures better crystallinity of the grown nanoparticles. Also, the reaction in paraffin wax can be frozen suddenly to study the evolution of the nanoparticles. Nanoparticles, thus synthesized, were characterized using transmission electron microscopy (TEM), high resolution TEM (HRTEM) and photoelectron spectroscopy (PES). PES shows formation of iron oxide and electron diffraction reveals that the particles are crystalline and form gamma-Fe2O3 phase. TEM shows the nanoparticles are mono-dispersed in diameter (20 +/- 2 nm) and they self assemble in three-dimensional hexagonal closed packed superlattices, because of high degree of uniformity in diameter.