单分散磷酸镧纳米棒的可控制备

采用一步水热法在无模板情况下合成了单一形貌和尺寸均匀的磷酸镧纳米棒,产物分散性好.这种合成方法操作简单、能耗低、合成条件可控,并且重复性很好、可大面积合成.用X射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)对磷酸镧的形貌、结构以及相组成进行了分析.结果表明:所合成磷酸镧为单斜相独居石结构;纳米棒直径为15 nm,长度约为几百纳米,具有相当高的纵横比,有望在性能方面得到优化;磷酸镧纳米棒为单晶.对影响磷酸镧纳米棒形成的反应条件如水热温度和水热时间进行了研究,并详细研究了其生长过程.提出了磷酸镧纳米棒的可能生长机制是基于纳米颗粒的定向粘附作用.

Controllable Preparation of Monodisperse LaPO4 Nanorods

Monodisperse LaPO_4 nanorods with uniform morphology and dimension were prepared by a one-step hydrothermal synthesis. This method provided a simple, inexpensive, controllable and reproducible process to produce LaPO_4 nanorods with an average diameter of 15 nm and a high aspect ratio. The as-syn-thesized products were characterized by powder X-ray diffraction (XRD) , scanning electron microscopy (SEM), transmission electron microscopy (TEM) and fast Fourier transform spectroscopy (FFT). And they were indicative of a single-crystalline monoclinic monazite structure and nanorod-morphology. The for-mation mechanism suggested that oriented attachment played a vital role in the growth of LAPO_4 nanorods, which recommended a favorable route to fabricate sim-ilar morphological and structural nanometer materials.