Microwave approach for the synthesis of rhabdophane-type lanthanide orthophosphate (Ln = La, Ce, Nd, Sm, Eu, Gd and Tb) nanorods under solvothermal conditions
作者:Chitta Ranjan Patra、Gabashvili Alexandra、Sujata Patra、David Solomon Jacob、Aharon Gedanken、Asher Landau、Yossi Gofer
DOI:10.1039/b415693e
日期:——
Rhabdophane-type hexagonal lanthanide orthophosphate, LnPO4·nH2O (Ln = La, Ce, Nd, Sm, Eu, Gd and Tb, n = 0 to 0.6), and body-centered tetragonal ErPO4·nH2O nanowires/nanorods have been successfully synthesized in high yield (>95%) by simple microwave heating of an aqueous solution of Ln(III) nitrate and NH4H2PO4 in the pH range 1.8–2.2. The reaction was conducted in a simple domestic microwave oven. The structure, morphology, composition and physical properties of the as-prepared products have been characterized by powder X-ray diffraction, low resolution transmission electron microscopy, high resolution transmission electron microscopy, selected area electron diffraction, thermogravimetric analysis, differential scanning calorimetry, infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy. The length and width of the resulting lanthanide orthophosphate nanowires/nanorods are in the range 70–2200 nm and 6–130 nm, respectively. A possible mechanism for the formation of LnPO4·nH2O nanowires/nanorods is briefly discussed.
通过对硝酸镧(III)和 NH4H2PO4 的水溶液在 pH 值为 1.8-2.2 的条件下进行简单的微波加热,成功合成了拉布多芬型六方镧系正磷酸盐 LnPO4-nH2O(Ln = La、Ce、Nd、Sm、Eu、Gd 和 Tb,n = 0 至 0.6)以及体心四边形 ErPO4-nH2O 纳米线/纳米棒,收率高达 95%以上。反应在一个简单的家用微波炉中进行。粉末 X 射线衍射、低分辨率透射电子显微镜、高分辨率透射电子显微镜、选区电子衍射、热重分析、差示扫描量热法、红外光谱、拉曼光谱、X 射线光电子能谱和光致发光光谱对制备产物的结构、形态、成分和物理性质进行了表征。所得正磷酸镧系元素纳米线/纳米棒的长度和宽度分别为 70-2200 纳米和 6-130 纳米。简要讨论了 LnPO4-nH2O 纳米线/纳米棒形成的可能机制。