咪唑类离子液体辅助水热法合成棒状微/纳米ZnO晶体

以醋酸锌和氢氧化钠为原料, 以水和含不同长度烷基链的咪唑类氯盐离子液体的混合物作为反应介质, 采用水热法合成出不同形貌的微/纳米ZnO晶体, 用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对合成的ZnO晶体进行表征. 研究了烷基链长度、 离子液体用量、 反应时间以及反应温度对形成棒状ZnO晶体形貌的影响. 实验结果表明, 所制备的棒状ZnO晶体样品均为六方晶系结构. 在棒状ZnO晶体的制备过程中, 控制反应温度, 选择不同的离子液体及其用量十分重要.

Preparation of Rod-like ZnO Micro/Nano-crystals by Imidazolium Ionic Liquid Assisted Hydrothermal Method

ZnO crystals with different morphologies were prepared by hydrothermal method using zinc acetate dihydrate and sodium hydroxide as raw materials and the mixture of 1-alkyl-3-methylimidazolium chloride ionic liquid(Emim]Cl, Bmim]Cl, Hmim]Cl or Omim]Cl) and water as the solvent. The as-prepared samples were characterized by scanning electron microscopy(SEM) and X-ray diffraction(XRD). The effects of alkyl chain lengths of imidazolium ionic liquids, the dosage of ionic liquids, reaction time and temperature on ZnO crystals during the formation process were investigated. The results indicate that the structures of the ZnO rods are hexagonal wurtzite. It is very important to select different ionic liquids and their dosage and to control reaction time and temperature in preparation of ZnO crystals with different morphologies.