简单水热法制备棒状纳米氧化锌及其表征

Simple hydrothermal synthesis and characterization of ZnO nanorods

以Zn(NO3)2和NaOH为原料,在不使用任何添加剂的条件下,采用水热合成法在不同的合成时间和合成温度下制备棒状纳米ZnO颗粒。通过X射线衍射(XRD)、透射电镜(TEM)、光致发光谱(PL)、电导率测试对样品进行表征。结果表明,所制备的纳米ZnO粉末具有六方红锌矿结构并沿(101)面择优生长;随着合成时间和温度的增加,样品的纯度逐渐增加;合成时间为25h,温度为200℃时,样品的结晶最好,样品基本成棒状,平均直径约为30～40nm,长度约为300～400nm、电阻率最大,且在376nm和500～600nm处有明显发射现象。深入分析了上述结果的形成原因。

Zinc oxide nanoparticles were prepared by using hydrothermal synthesis method.The effect of synthesis conditions on the properties of nanometer was studied.ZnO nanoparticles were obtained when using Zn（NO3）2,NaOH and H2O as properties and hydrothermalmedia.The X-ray diffraction（XRD）,the electronic resistivity and the photoluminescence spectrum are applied to investigate the optical and electric properties of ZnO.The result indicated that the samples are zincite in structure and show sharp diffraction peak of ZnO at（101）;the electronic resistivity decrease with increasing the time and temperature of synthesis.When time of the synthesis was 25h and temperature was 200℃,ZnO was purest and higher emission at 376nm,500-600nm,the particle figure was rods,and the even diameter of the nanometer-sized rods ZnO was about 30-40nm and its length was about 300-400nm analyzed by TEM.The reasons of the above-mentioned phenomena are deeply discussed.