【摘要】 以尿素、醋酸锌为原料,采用微波水解法制备纳米ZnO,利用SiO2对纳米ZnO包覆改性,并通过XRD,TEM,分光光度计等对纳米ZnO的形状和尺寸进行表征,对其性能进行测试.结果表明,纳米ZnO改性的最佳工艺条件为:w(SiO2)=3%,时间0.5 h,温度80℃.纳米ZnO的比表面积改性前为20.21 m2/g,改性后为14.65 m2/g,且改性后纳米ZnO的吸光度明显提高.TEM显示纳米ZnO表面有明显的包覆层,说明用SiO2包覆纳米ZnO是可行的.更多还原

【Abstract】 ZnO nanoparticles were prepared from urea and zinc acetate by hydrolysis under microwave radiation method.The products were modified by surface coated with SiO2.The particle size,crystalline structure and morphology were studied by XRD,TEM,spectral photometer and so on.The results showed that the optimum modification condition is as follows:modification reagent content was 3%,the time of modification was 0.5 h,the temperature of modification was 80 ℃;specific area of the coated and uncoated ZnO nanoparticles were 14.65 m2/g and 20.21 m2/g.Anti-ultraviolet characteristic of the coated ZnO nanoparticles was increased clearly;The TEM showed that the SiO2 has been coated on the ZnO nanoparticles.更多还原