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采用脉冲激光沉积技术先在Si(111)衬底上制备Zn薄膜,然后在石英炉中热蒸发金属锌粉的方法制备了ZnO晶须.分别用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HRTEM)和光致发光(PL)谱对样品的结构、成分、形貌和光学特性进行了表征.结果表明,采用此方法得到的ZnO多角晶须为六方纤锌矿结构, 其根部直径大约在100~500nm之间,尖部直径大约为40nm左右,长约几个微米.Zn薄膜能够有效地促使晶核的形成与长大从而促进了ZnO晶须的形成.最后, 简单讨论了ZnO 纳米晶须的生长机制.

参考文献

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