以氢氧化铝和氢氧化锂为原料, 在120℃反应10～17d的水热条件下, 制备出Al(OH)3·xH2O前驱物. 此前驱物经400℃热分解1h, 得到了Al2O3纳米棒. 通过TEM、HRTEM、SAED和XRD等分析手段对产物进行了表征, 并以TGA分析Al(OH)3·xH2O前驱物受热分解时的热力学行为. 实验结果发现: 产物形貌为棒状, 呈现单晶特性. 纳米棒的成长符合Ostwald熟化与方向附着机制. 同时发现了碱液对纳米棒的形成有很大的影响, 以5mol/L KOH碱液取代原来的LiOH碱液时, 出现更细小形貌的纳米线, 尺寸为φ2nm×(10～25)nm.
Alumina nanorods were successfully prepared from the thermal decomposition of Al(OH)3·xH2O nano precursors obtained hydrothermally at 120℃ for 10--17d, by using Al(OH)3 and LiOH as raw materials. The as-prepared samples were characterized by TEM, HRTEM, SAED and XRD. Besides, the thermal behavior of decomposing Al(OH)3·xH2O precursors synthesized by hydrothermal process was studied through TGA. The results show that the as-prepared Al2O3 nanorods have rod-like morphology and single crystalline nature. The mechanism for the Al2O3 nanorods growth is agreed to Ostwald ripening and oriented attachment. Lye plays an important role in synthesizing the Al2O3 nanorods. As 5mol/L KOH lye displaces original LiOH, the
as-prepared nanowires in the reaction have smaller morphology, with a diameter of 2nm and a length of 10--25nm.
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