以硝酸镁、硼酸、柠檬酸为原料, 利用溶胶-凝胶法及不同温度后续煅烧制备了硼酸镁(MgB4O7
和Mg2B2O5)纳米棒. 用X射线衍射(XRD)分析了纳米棒的结构, 用扫描电子显微镜(SEM)和透射电子显微镜(TEM)观察了纳米棒的形貌. 实验结果表明, 750℃煅烧产物为MgB4O7纳米棒, 950℃煅烧产物为Mg2B2O5纳米棒, 纳米棒的径长比可以通过调节原料硝酸镁和硼酸的比例来控制. 用自催化机理解释了硼酸镁纳米棒的生长机理.
The magnesium borate (MgB4O7 and Mg2B2O5) nanorods were fabricated with magnesium nitrate, boric acid and citric acid as the starting reagents by the sol-gel method. The structures and morphologies of the nanorods were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the products synthesized by calcining were MgB4O7 at 750 ℃ and Mg2B2O5 at 950℃. The ratios of diameter and length of the nanorods can be controlled by adjusting the proportion of Mg(NO3)2 and H3BO3. The self-catalytic mechanism was used to explain the growth of the magnesium borate nanorods.
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