ZnO纳米棒水热法制备及其发光特性研究

Hydrothermal Fabrication and Optical Properties of ZnO Nanorods

采用氢氧化钾(KOH)和二水醋酸锌(Zn(CH3COO)2.2H2O)配制不同浓度的反应溶液,反应过程中加入表面活性剂聚乙二醇(HO(CH2CH2O)13H),在80℃水热反应条件下制备出了优异的ZnO纳米材料。采用扫描电镜(SEM)、X射线衍射(XRD)、荧光光谱仪等测试方法研究了样品的成分、表面形貌和微结构。SEM研究结果显示:样品沿c轴择优生长,径粒分布均匀,长径比高,为六方纤锌矿结构的ZnO纳米棒和菊花状ZnO纳米棒。光致发光谱性能分析显示样品在392 nm附近具有很强的紫外光发射能力,随着反应物浓度的增加,紫外峰发生约3 nm的蓝移,同时,样品还在绿光535 nm附近有较弱的光致发光现象。以上结果表明所制备的ZnO纳米材料具有优异的紫外光发射能力。

ZnO nanorods were synthesized with KOH and Zn（CH3COO）2·2H2O under 80 ℃ temperature conditions,and the HO（CH2CH2O）13H was used as surfactant.The ingredient,surface morphology and microstructures of ZnO samples were characterized respectively with scanning electron microscopy（SEM）,X-ray diffraction（XRD）and photoluminescence（PL）.SEM results show that the samples are mainly consisted of nanorods and flower-like nanorods of hexagonal crystals,and the nanorods are uniformly elongated along the c-axis and show well-defined crystallographic faces.PL spectrums show that there is strong ultraviolet（UV）emitting light at about 392 nm area,and with the increase of reactant concentration,UV peaks occur about 3 nm blue-shift.Moreover,the samples also have weak green photoluminescence phenomenon at about 535 nm.These results indicate that the prepared ZnO have excellent UV emission capacity.