Non-monotonic size change of monodisperse Fe3O4 nanoparticles in the scale-up synthesis
Non-monotonic size change of monodisperse Fe3O4 nanoparticles in the scale-up synthesis
复制标题
放大合成中单分散 Fe3O4 纳米粒子的非单调尺寸变化
DOI：
10.1039/c3nr33950e
复制
发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Cheng, Zhao-Hua
中科院分区：
文献类型：
--
作者：
Song, Ning-Ning;Yang, Hai-Tao;Cheng, Zhao-Hua
在放大的有机相合成中观察到直径为3-20 nm的单分散Fe 3 O 4纳米颗粒（NPs）的非单调尺寸变化。通过X射线衍射（XRD）和穆斯堡尔谱（Mossbauer spectroscopy）分别对纳米粒子的晶体结构和Fe离子的价态进行了表征。有趣的是，观察到的颗粒尺寸不单调减小与油酸（OA）的摩尔比的增加，FeO中心点OH，或前体浓度的降低。此外，通过时间相关的傅里叶变换红外光谱（FTIR）和透射电子显微镜（TEM）图像，这表明非单调的尺寸变化的结果从不同的影响，OA的三个反应阶段，包括单体的形成，成核，并随着前体量的增长。
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 Mossbauer 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 center dot 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.