The CuO nanowires with particle hierarchical structure have been prepared by ultrasound method in a solution phase,where Cu2(OH)2C2O4 and NaOH were used as the raw material and water soluble polyvinyalcohol (PVA) as an as-sistant agent. Furthermore,we studied the effect of hydrothermal,microwave and ultrasound methods on the morphology of CuO. The results show that the morphology of the CuO product is significantly influenced by synthetic method and ultrasound processing plays a decisive role on the form ation of nanowire-like morphology. The existence of PVA is helpful to the uniformity of the CuO morphology. The structure iind morphology of the CuO nanowires were characterized by XRD,SEM,TEM,HRTEM,and their photoluminescence proirerties were investigated by UV-Vis absorption spectrum and PL emission spectrum. The surface structure of the product was studied by FT-IR. The results demonstrate that the synthesized CuO nanocrys-tals are of wire-like shape with diameters 10~15 nm and lengths from 2 to 4 um. The calculated average primary particle size of the hierarchical CuO nanowires is 14. 6 nrn. Compared to bulk CuO,the band edge of the CuO nanowires blue shifts significantly,and the bandgap energy is determined to be 2. 67 eV from UV-Vis absorption spectrum,which could be attributed to quantum size effect. The UV-Vis absorption spectrum and PL spectrum of the CuO nanowires show that their light harvesting capability in UV region is large,and it c an emit purple-blue light.%以碱式草酸铜和氢氧化钠为反应原料,聚乙烯醇为辅助试剂,采用超声法合成了具有颗粒次级结构的纳米线状CuO,并研究了水热、微波、超声法三种合成方法对CuO形貌的影响.实验结果表明不同的合成方法对样品的形貌影响很大,并且超声处理对于制备纳米线状氧化铜起到了至关重要的作用,而辅助试剂有助于形成形貌更加均一的产物.分别采用XRD、SEM、TEM及HRTEM研究产物的结构与形貌,以FT-IR观察产物的表面结构与成键特性,通过UV-Vis吸收光谱及荧光光谱(PL)研究产物在紫外-可见光区的光捕获能力及荧光发射情况.测试结果表明氧化铜纳米线的直径约为10～15 nm,长度约为2～4 um,组成纳米线的颗粒次级结构的计算平均粒径为14.6 nm.与体相CuO材料相比,CuO纳米线的吸收带边出现了明显的蓝移现象,其带隙能为2.67 eV,这可归于量子尺寸效应.光谱研究结果表明样品在紫外光区具有较强的光捕获能力,并能发出蓝紫光.
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