电子束辐照制备钼酸锰纳米材料

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Mn2 Mo3 O8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Mnx Mo3 O8.进一步分析发现,Mnx Mo3 O8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.

Synthesis of the manganese molybdate nanomaterialsthrough electron beam irradiation

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, Mn2 Mo3 O8 nanosheets and MoO2 nanoparticles are synthesized through the sample with lower Mn and O contents, while mainly Mnx Mo3 O8 with higher Mn and O contents. Furthermore, the generation of the new hexagonal Mnx Mo3 O8 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 Mnx Mo3 O8 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.