Ag纳米粒子修饰ZnO纳米线特性研究

The research on properties of ZnO nanowires modified by Ag nanoparticles

利用水溶液法制备ZnO纳米线,使用真空热蒸发方法用Ag对ZnO纳米线进行表面修饰。用场发射扫描电子显微镜(FESEM)、X射线衍射(XRD)仪、吸收谱仪分析它们的表面形貌、物相结构及光学性质,同时分析了其场发射性能。结果表明,随着Ag修饰量的增加,ZnO纳米线表面上的Ag纳米粒子分布会由稀疏逐步到致密,最后Ag的纳米粒子几乎连在一起。测量吸收谱线发现修饰后的ZnO纳米线的吸收能力变强,但存在一个临界值,当修饰量超过临界值后,ZnO纳米线的光吸收能力会减弱。对修饰后ZnO纳米线的场发射性能进行初步测试,结果表明适当量的Ag修饰可以有效降低ZnO纳米线的场发射开启电压。

Hydrothermal solution method and thermal vacuum evaporation method are used to grow ZnO nanowires with different mass of Ag modification. The surface morphology,crystal structure and optical property of the samples are characterized by field emission scanning electron microscopy( FESEM),X-ray diffraction( XRD) and spectrometer absorption. Also the property of field emission is tested. The results indicate that with the mass of Ag increasing,the surface morphology of the samples change from Ag nanodots on ZnO nanowires to ZnO nanowires nearly all covered by Ag nanoparticles. The absorption spectrum indicate that the ability of light absorption will enhance after modified by Ag. However,there will be a critical value. If the mass of Ag beyond the critical value,the absorption ability will be descend. At last,field emission properties also be researched,the result reveal that the modification of Ag will decrease the threshold voltage.