形貌可控纳米/微米ZnO的绿色合成及光致发光性能研究

以[Bmim]Cl、[Bmim]BF_4、[C_2OH]mimCl和[C_2OHmim]BF_4四种室温离子液体为模板,采用微波加热前驱体Zn(OH)_4~(2-)溶液的方法制备了多形貌纳米/微米ZnO.采用XRD、SEM、TEM对实验样品进行了结构和形貌表征,通过SEM照片分析了不同合成条件对产物形貌的影响.结果表明:合成产物为结晶良好,具有六方纤锌矿结构的ZnO;不同离子液体中合成了鳞状、片状、棒状、锥状纳米ZnO晶体单元,大量ZnO晶体聚集成微米球、花簇;随着前驱体原料配比增大,[0001]方向择优生长明显;随温度从80 ℃增加到95 ℃,ZnO纳米锥生长趋势总体趋于明显, 长径比增大,同时产物形貌的规整性也明显变好;探讨了多形貌纳米/微米ZnO的生长机理;采用室温下光致发光(PL)光谱对多形貌纳米ZnO的光学性能研究表明,多形貌纳米ZnO具有较强的紫外发射和相对较弱的蓝绿发射,离子液体[Bmim]Cl中合成的ZnO纳米锥在387 nm处紫外发射峰强度最大,离子液体[C_2OHmim]Cl 中合成的ZnO纳米片在497 nm处有较强的绿光发射峰.

Study on the Green Synthesis and Photoluminescence Property of Morphology Controllable Nano/Micro ZnO

Using room temperature ionic liquids(RTILs)[Bmim]Cl,[Bmim]BF4,[C2OH]mimCl and [C2OHmim]BF4 as template,zinc oxide of different morphology was successfully synthesized with microwave method in Zn(OH)2-4 precursor solution.The as-prepared samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM).The influence of different conditions on the morphology were also studied by SEM.The results showed that the nanometer ZnO were single crystalline wit...