Mn离子掺杂对α-FeOOH结构和形貌的影响

Influence of Mn-Dopant on the Structure and Morphology of α-FeOOH Nanorods

本文采用水热合成方法,在120℃碱性条件下制备出形貌均一的短棒状α-FeOOH纳米粒子,对其进行了金属离子Mn的掺杂。系统研究了Mn离子掺杂对产物物相结构和形貌的影响,对产物进行了X射线衍射(XRD)、红外光谱(IR)、穆斯堡尔谱(MES)、场发射扫描电镜(FE-SEM)和高分辨透射电子显微镜(HRTEM)表征。结果表明:低浓度Mn离子掺杂对α-FeOOH的形成起了形貌和物相调控作用。α-FeOOH纳米棒的长径比随着Mn离子加入量的增大逐渐增加;当nMn(Ⅱ)/nFe(Ⅲ)=0.30时,产物变成了α-(Fe,Mn)OOH和MnFe2O4的混合物,形貌为纳米棒和纳米颗粒。

Goethite （α-FeOOH） nanorods with uniform sizes were successfully prepared by hydrothermal method in alkaline solutions at 120 ℃. The effects of Mn-dopant on the phase structure and morphology were investigated systematically using X-ray diffraction （XRD）, mossbauer spectroscopy （MES）, fourier transform infrared spectroscopy （FTIR）, field-emision scanning electron microscopy （FE-SEM）, and high-resolution transmission electron microscope （HRTEM）. It was found that the concentration of Mn^2＋ ion plays an important role in modulating the morphology and phase structure of α-FeOOH. The aspect ratio of nanorods increases with Mn ion concentration increasing. When the atomic ratio of Mn ion and Fe ion （nMn（Ⅱ）/nFe（Ⅲ）） is 0.30, the α-（Fe,Mn）OOH and MnFe2O4 mixture was formed with the morphology of irregular nanorods and nanoparticles.