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以锐钛矿TiO2为起始原料,通过水热法制备了钛酸盐纳米棒,对合成不同长度和宽度的钛酸盐纳米棒的影响和控制条件进行了研究。用X射线衍射(XRD)和扫描电子显微镜(SEM)对纳米棒的形貌和结构进行了表征。结果表明水热温度和处理时间能对纳米棒的形貌和结构进行有效的控制,得到理想的钛酸盐的结构。在更高的温度下(200℃),钛酸盐纳米管将更快的转化为纳米棒,而随着处理时间的延长,其形貌结构发生有规律的变化。在96 h处理时间后纳米棒束的宽度为50 nm到1μm,长度可以达到几十微米。对后处理中酸洗对产物的形貌和晶体结构的影响也进行了对比研究,发现在酸洗之前钛酸盐纳米棒结构就已经形成,但是酸洗能使产物的晶体结构产生变化,同时使纳米棒的表面形貌更加光滑规整。最后对比研究原料和产物的紫外-可见吸收光谱,发现纳米管/棒在250至350 nm处有宽带隙吸收。
Titanate nanorods were synthesized by hydrothermal method from anatase TiO2. The effects of different lengths and widths of titanate nanorods and their control conditions were studied. The morphology and structure of nanorods were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that hydrothermal temperature and processing time can effectively control the morphology and structure of the nanorods and obtain the ideal titanate structure. At higher temperatures (200 ° C), titanate nanotubes will transform into nanorods faster, and their morphological structure changes regularly as the processing time increases. The nanorod bundles have a width of 50 nm to 1 μm and a length of several tens of micrometers after 96 h treatment time. The effect of acid pickling on the morphology and crystal structure of the product was also studied. It was found that the titanate nanorod structure was formed before pickling, but pickling could change the crystal structure of the product. At the same time, So that the surface morphology of nanorods more smooth and regular. Finally, the UV-vis absorption spectra of the starting materials and products were compared and found to have a wide bandgap absorption at 250 to 350 nm.