微波法合成硫化铋纳米棒

Synthesis of bismuth sulfide nanorods by microwave irradiation

以柠檬酸铋、硫脲为反应原料,在表面活性剂存在下,采用微波法合成了直径为30～50nm的硫化铋纳米棒.利用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等对其进行了表征.考察了表面活性剂种类、用量对硫化铋纳米棒形貌和晶型的影响.结果表明:β-环糊精(β-CD)和十六烷基三甲基溴化铵(CTAB)有利于形成硫化铋纳米棒,并且较低浓度的β-CD(约0.005mo.lL-1)有利于形成分散性较好的硫化铋纳米棒.初步探讨了制备方法对硫化铋纳米棒晶型和合成时间的影响.结果发现,微波法制备纳米硫化铋与回流法相比,其晶格的生长方向不同,并且可以节省约80%的反应时间.

Bismuth sulfide nanorods were synthesized from bismuth citrate and thiourea by microwave irradiation in the presence of surfactants.The products were characterized by X-ray diffraction （XRD）,scanning electron microscopy （SEM） and transmission electron microscopy （TEM）.The influence of surfactants on the morphology and crystallization of Bi2S3 nanorods was discussed.It is found that cetyltrimethyl ammonium bromide （CTAB） and β-cyclodextrin （β-CD） benefit the formation of Bi2S3 nanorods.Low concentration of β-CD （～0.005mol·L^-1） is favorable to the synthesis of well-separated Bi2S3 nanorods.The effect of preparation methods on the synthesis of Bi2S3 nanorods was also discussed.The results show that microwave irradiation saves about 80% of reaction time in comparison with the refluxing method,and Bi2S3 nanorods exhibit different crystal lattice growth directions in these two methods.