利用具有高速度分辨率的穆斯堡尔谱学对氧化铁纳米颗粒进行研究。
Study of Iron oxide nanoparticles using Mössbauer spectroscopy with a high velocity resolution.
作者信息
Oshtrakh M I, Ushakov M V, Šepelák V, Semionkin V A, Morais P C
机构信息
Department of Physical Techniques and Devices for Quality Control, Institute of Physics and Technology, Ural Federal University, Ekaterinburg 620002, Russian Federation; Department of Experimental Physics, Institute of Physics and Technology, Ural Federal University, Ekaterinburg 620002, Russian Federation.
Department of Physical Techniques and Devices for Quality Control, Institute of Physics and Technology, Ural Federal University, Ekaterinburg 620002, Russian Federation; Department of Experimental Physics, Institute of Physics and Technology, Ural Federal University, Ekaterinburg 620002, Russian Federation.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2016 Jan 5;152:666-79. doi: 10.1016/j.saa.2015.06.017. Epub 2015 Jun 14.
Iron oxide (magnetite and maghemite) nanoparticles developed for magnetic fluids were studied using Mössbauer spectroscopy with a high velocity resolution at 295 and 90K. The recorded Mössbauer spectra have demonstrated that usual physical models based on octahedral and tetrahedral sites were not suitable for fitting. Alternatively, the Mössbauer spectra were nicely fitted using a large number of magnetic sextets. The obtained results showed that the Mössbauer spectra and the assessed parameters were different for nanoparticles as-prepared and dispersed in the dispersing fluid at 295K. We claim that this finding is mainly due to the interaction of polar molecules with Iron cations at nanoparticle's surface or due to the surface coating using carboxylic-terminated molecules. It is assumed that the large number of spectral components may be related to complexity of the nanoparticle's characteristics and deviations from stoichiometry, including in the latter the influence of the oxidation of magnetite towards maghemite.
利用穆斯堡尔谱在295K和90K下对为磁流体开发的氧化铁（磁铁矿和磁赤铁矿）纳米颗粒进行了高速分辨率研究。记录的穆斯堡尔谱表明，基于八面体和四面体位置的常规物理模型不适用于拟合。相反，使用大量磁性六重峰对穆斯堡尔谱进行了很好的拟合。所得结果表明，在295K下，制备好的纳米颗粒及其分散在分散液中的穆斯堡尔谱和评估参数不同。我们认为这一发现主要是由于极性分子与纳米颗粒表面的铁阳离子相互作用，或者是由于使用了羧基封端分子进行表面包覆。据推测，大量的光谱成分可能与纳米颗粒特性的复杂性和化学计量比偏差有关，包括后者中磁铁矿氧化为磁赤铁矿的影响。
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