表面活性剂辅助合成CdWO4纳米棒和纳米线

以Na₂WO₄?2H₂O和CdCl₂ 为主要原料, 分别在十六烷基三甲基溴化铵(CTAB)和十二烷基苯磺酸钠(SDBS)表面活性剂中, 在180 ℃反应16 h, 水热制备了CdWO₄纳米棒和纳米线. 利用X射线粉末衍射(XRD)、透射电子显微镜(TEM)和高分辨透射电子显微镜(HRTEM)等手段对产物进行了表征, 并对其在室温下的发光特性进行了测定. 实验结果表明: 产物均为具有单斜结构的单相CdWO₄. 其中CdWO₄纳米棒具有单晶属性, 平均粒径约为63 nm, 长度近1 µm; 而CdWO₄纳米线具有多晶特性, 平均粒径约为12 nm, 长度达十几微米. 当激发波长为253 nm时均有460 nm强的发射峰, 其中CdWO₄单晶纳米棒的发光强度大于CdWO₄多晶纳米线. 分别对CdWO₄纳米棒和纳米线形成的可能机理进行了初步分析.

Surfactant-Assisted Synthesis of CdWO4 Nanorods and Nanowires

CdWO₄ nanorods and nanowires were synthesized hydrothermally at 180 ℃ for 16 h in cetyltrimethylammonium bromide (CTAB) or sodium dodecylbenzenesulfonate (SDBS) surfacant, using Na₂WO₄?2H₂O and CdCl₂ as main materials. The as-prepared samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM). Luminescent properties of the samples were measured at room temperature. The results showed that CdWO₄ nanorods exhibit single crystalline nature with the average diameter of 63 nm and length up to 1 µm. While CdWO₄ nanowires exhibit polycrystalline nature with the average diameter of 12 nm and length up to several micrometers. Both of them display a very strong PL peak at 460 nm with the excitation wavelength 253 nm. The PL intensity of CdWO₄ nanorods is larger than that of CdWO₄ nanowires. The possible formation mechanism of CdWO₄ nanorods and nanowires was suggested.