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首页> 外文期刊>RSC Advances >Crystallinity depends on choice of iron salt precursor in the continuous hydrothermal synthesis of Fe–Co oxide nanoparticles
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Crystallinity depends on choice of iron salt precursor in the continuous hydrothermal synthesis of Fe–Co oxide nanoparticles

机译：结晶度取决于在连续水热合成Fe-Co氧化物纳米粒子中铁盐前体的选择

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摘要

A series of Fe–Co oxide nanoparticles (NPs) were prepared by a continuous hydrothermal method using iron nitrate and ammonium iron citrate as alternative iron precursors. The crystallinity, Fe/Co composition and element spatial distribution in the synthesised NPs were investigated using X-ray diffraction (XRD), aberration-corrected scanning transmission electron microscopy (ac-STEM) imaging, energy-dispersive X-ray spectroscopy (EDX) and electron energy loss spectroscopy (EELS). Strong dependence on the choice of iron salt was observed. We demonstrate that the presence of ammonium citrate markedly improves the crystallinity of the NPs; an ordered cobalt ferrite alloy is formed. We suggest this is due to the formation of a homogenous reaction environment during the thermal decomposition of ammonium citrate, and the formation of complexes among citrate, Fe and Co ions.
机译：通过使用硝酸铁和柠檬酸铁铵作为替代铁前体的连续水热法制备了一系列的Fe-Co氧化物纳米颗粒（NPs）。使用X射线衍射（XRD），像差校正扫描透射电子显微镜（ac-STEM）成像，能量色散X射线光谱（EDX）研究了合成NP中的结晶度，Fe / Co组成和元素空间分布和电子能量损失谱（EELS）。观察到强烈依赖于铁盐的选择。我们证明柠檬酸铵的存在显着提高了NPs的结晶度。形成有序的钴铁氧体合金。我们认为这是由于柠檬酸铵热分解过程中形成了均匀的反应环境，以及柠檬酸根，Fe和Co离子之间形成了络合物。

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