NaOH溶液中CdS纳米棒的水热合成

在NaOH溶液中水热合成了CdS纳米棒, 并探讨了NaOH溶液浓度和反应时间对CdS纳米棒形貌及晶体结构的影响及其可能的生长机理和母液循环可行性. 用粉末X射线衍射(XRD)、 扫描电子显微镜(SEM)、 透射电子显微镜(TEM)、 高分辨透射电子显微镜(HRTEM)和选区电子衍射(SAED)对CdS纳米棒进行了表征, 并考察了其在可见光照射下光催化降解亚甲基蓝的活性. 结果表明, NaOH溶液是形成棒状形貌的关键因素. 在最优实验条件下, 可获得六方纤锌矿结构CdS纳米棒, 直径约200 nm, 长度可达4 μm. 该纳米棒具有良好的可见光光催化活性.

Hydrothermal Synthesis of CdS Nanorods in NaOH Solution

CdS nanorods were synthesized via a hydrothermal route in NaOH solution and characterized by scanning electron microscopy(SEM), powder X-ray diffraction(XRD), transmission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM) and selected area electron diffraction(SAED). The influences of NaOH concentration and hydrothermal time on morphology and crystalline structure of CdS nanorods were studied, and a probable growth mechanism was proposed. The feasibility of recycling of mother liquor was also investigated. The visible light photocatalytic activity of CdS nanorods was evaluated by photocatalytic degradation of methylene blue(MB). The experimental results showed that NaOH solution played a role of complexing agent in the growth of CdS nanorods and was the key factor in the formation of rod-like morphology. The sample obtained in optimal experimental condition was CdS nanorod with an average diameter of ca. 200 nm and a length up to ca. 4 μm. The CdS nanorods were hexagonal single-crystals with high crystallinity growing along the 001] direction, and showed good photocatalytic activity and stability under visible light.