Selective synthesis of monoclinic and tetragonal phase LaVO4 nanorods via oxides-hydrothermal route
Selective synthesis of monoclinic and tetragonal phase LaVO4 nanorods via oxides-hydrothermal route
复制标题
氧化物-水热法选择性合成单斜相和四方相 LaVO4 纳米棒
DOI：
10.1007/s11051-007-9312-9
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发表时间：
2008-05-01
影响因子：
2.5
通讯作者：
Ding, Yaping
中科院分区：
文献类型：
--
作者：
Ma, Jie;Wu, Qingsheng;Ding, Yaping
Pure monoclinic (m-) and tetragonal (t-) LaVO4 nanorods are successfully obtained via a facile oxides-hydrothermal method, in which V2O5 and La2O3 bulk powders are directly utilized as precursors without pretreatment. It is found that ethylenediamine tetraacetic disodium salt (EDTA) is a key factor for synthesizing t-LaVO4. The as-obtained products are characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and selected area electron diffraction (SAED). The FTIR spectra of VO4 around 800 cm−1 are suggested as an effective auxiliary means to identify the crystal phase of LaVO4. UV–Visible spectra of LaVO4 nanomaterials are obvious blue shift compared with the bulk m-LaVO4 materials. The different photoluminescent properties of Eu3+ doped m- and t-LaVO4 are demonstrated. A dissolution–precipitation mechanism is mainly responsible for the anisotropic morphology and phase control evolution of the LaVO4 nanocrystals. The oxides-hydrothermal system is also applicable to prepare other pure LnVO4 (Ln3+: Nd3+, Y3+, Sm3+) and doped LnVO4 nanomaterials.
