电子束辐照制备钼酸锰纳米材料

李敏敏,曹 凡,贾双凤,郑 赫,王建波 *,赵东山

电子束辐照制备钼酸锰纳米材料

李敏敏1,曹 凡1,贾双凤1,郑 赫1,王建波1,2*,赵东山1

(武汉大学物理科学与技术学院,电子显微镜中心,人工微结构教育部重点实验室和高等研究院,湖北 武汉430072;2. 中南大学轻质高强结构材料重点实验室,湖南 长沙410083)

摘要  在透射电子显微镜中,利用电子束辐照诱导的方法合成了钼酸锰片状纳米材料。研究发现在电子束辐照前,由于Mn、O等的相对含量不同样品可以分为两类。其中Mn和O含量较低的样品经电子束辐照后的产物为Mn2Mo3O8纳米片和MoO2纳米颗粒。而Mn和O含量较高的则主要生成六角结构的新相MnxMo3O8。进一步分析发现,MnxMo3O8的生成可能是因为样品中Mn相对含量较高,导致Mn、Mo和O原子层堆垛方式发生了改变。同时也初步确定了MnxMo3O8的晶胞参数为aH2= 0.59 nm,cH2= 6.24 nm。研究结果不仅提供了利用电子束辐照制备钼酸盐纳米材料的新方法,同时也促进了对钼酸锰材料的认识。

关键词  钼酸锰;电子束辐照;电子显微学

中图分类号:TG146. 4 + 12;TG115. 21+ 5. 3  文献标识码:A   doi:10.3969/j.issn.1000-6281.2017.04.005

 

Synthesis of the manganese molybdate nanomaterials through electron beam irradiation

LI Min-min1, CAO Fan1, JIA Shuang-feng1, ZHENG He1, WANG Jian-bo12*, ZHAO Dong-shan1

(1. School of Physics and Technology, Center for Electron Microscopy, MOE Key Laboratory of Artificial Micro- and Nano-structures, and Institute for Advanced Studies, Wuhan University, Wuhan Hubei 430072; 2. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha Hunan 410083, China)

Abstract  Manganese molybdate nanosheets are synthesized through electron beam (e-beam) irradiation inside a transmission electron microscope. There are two kinds of samples before e-beam irradiation, according to the different contents of Mn and O. After irradiated by the e-beam, Mn2Mo3O8 nanosheets and MoO2 nanoparticles are synthesized through the sample with lower Mn and O contents, while mainly MnxMo3O8 with higher Mn and O contents. Furthermore, the generation of the new hexagonal MnxMo3O8 phase can be ascribed to higher Mn content in the initial reactant, which results in the different stacking of Mn, Mo and O atoms. Meanwhile, the lattice parameters of MnxMo3O8 is determined to be aH2 = 0.59 nm, cH2 = 6.24 nm. The results not only provide a new strategy for the synthesis of molybdate nanomaterials by electron beam irradiation, but also facilitate the understanding of manganese molybdate materials.

Keywords  manganese molybdate; electron beam radiation; electron microscopy

 

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