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微波法合成硫化鉍納米棒

Synthesis of bismuth sulfide nanorods by microwave irradiation

  • 摘要: 以檸檬酸鉍、硫脲為反應原料,在表面活性劑存在下,采用微波法合成了直徑為30~50nm的硫化鉍納米棒.利用X射線衍射(XRD)、掃描電子顯微鏡(SEM)和透射電子顯微鏡(TEM)等對其進行了表征.考察了表面活性劑種類、用量對硫化鉍納米棒形貌和晶型的影響.結果表明:β-環糊精(β-CD)和十六烷基三甲基溴化銨(CTAB)有利于形成硫化鉍納米棒,并且較低濃度的β-CD(約0.005 mol·L-1)有利于形成分散性較好的硫化鉍納米棒.初步探討了制備方法對硫化鉍納米棒晶型和合成時間的影響.結果發現,微波法制備納米硫化鉍與回流法相比,其晶格的生長方向不同,并且可以節省約80%的反應時間.

     

    Abstract: 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 (~0.005 mol·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.

     

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