Hu Hanmei, Xu Junchan, Deng Chonghai, Ge Xinqing
J Nanosci Nanotechnol. 2014 Jun;14(6):4462-8. doi: 10.1166/jnn.2014.8287.
A mild one-pot hydrothermal route has been successfully designed to controllably prepare orthorhombic alpha-MoO3 nanobelts and monoclinic MoO2 microaxletrees respectively by adjusting the dosage of (NH4)6M07O24 x 4H2O (AHM). The products are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV-visible absorption spectrum. The as-prepared alpha-MoO3 nanobelts, with widths of 100-400 nm and lengths up to 30-40 microm, grow along [001] direction. The as-obtained MoO2 microaxletrees are assembled by countless nanolaths with the thickness of 80-150 nm. The chemical reaction processes for the formation of MoO(x) (MoO3 and MoO2) phases are investigated based on the experimental phenomena. The possible growth mechanisms are also discussed. The band gap energies (E(g)) of the obtained alpha-MoO3 nanobelts and MoO2 microaxletrees are calculated to be 2.90 and 3.72 eV, respectively. This work exhibits an effective approach in the selectively controlled synthesis of MoO(x) (x = 2, 3) nanomaterials via one-step hydrothermal strategy.
通过调节(NH4)6M07O24·4H2O（AHM）的用量，成功设计了一种温和的一锅水热路线，分别可控地制备正交晶系α-MoO3纳米带和单斜晶系MoO2微轴树。通过X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）和紫外可见吸收光谱对产物进行了表征。所制备的α-MoO3纳米带宽度为100-400nm，长度可达30-40μm，沿[001]方向生长。所获得的MoO2微轴树由无数厚度为80-150nm的纳米片组装而成。基于实验现象研究了MoO(x)（MoO3和MoO2）相形成的化学反应过程。还讨论了可能的生长机制。计算得到的α-MoO3纳米带和MoO2微轴树的带隙能量（E(g)）分别为2.90和3.72eV。这项工作展示了一种通过一步水热策略选择性控制合成MoO(x)（x = 2, 3）纳米材料的有效方法。
