采用激光刻蚀法在水溶液中制备了氧化铜纳米粒子, 刻蚀完成后将氧化铜胶体沉积在铝片上形成一层氧化铜岛膜。所得纳米粒子的紫外—可见吸收峰在280 nm处, 表明所得为氧化铜。原子力显微镜观察表明所制得的纳米粒子具有椭圆状结构, 长轴约为30~50 nm, 厚度约为8 nm。扫描电镜图片显示氧化铜粒子沉积在铝基底后形成了大小在0.5 μm左右的叶片状的聚集体。以10-5 M 的4-巯基吡啶(4MPY)为探针分子对氧化铜岛膜的表面增强拉曼散射(surface-enhanced Raman scattering, SERS)进行了研究。结果证明, 氧化铜岛膜具有良好的表面增强特性。对4MPY的SERS光谱进行了分析, 推测出4MPY在本实验体系中主要以质子化的形式存在, 通过S原子倾斜地吸附在氧化铜粒子表面。

Copper oxide nanoparticles were prepared by laser ablation in aqueous solution. UV/Vis spectrum of the sample showed a characteristic absorption peak at 280 nm, which indicated the as-prepared nanoparticles were copper oxide. Atomic force microscopy (AFM) revealed that copper oxide nanoparticles have an elliptical shape of major axis size 30—50 nm and of thickness ~ 8 nm. Scanning electron microscope (SEM) showed that leaf-shaped aggregates appeared after deposition of copper oxide nanoparticles on an aluminum foil. A good surface enhancement effect of these aggregates was confirmed by Raman measurement. The SERS spectral evidences indicated that 4-mercaptopyridine adsorbed onto the copper oxide surface via the S atom with the protonated pyridine N atom. The molecular plane assumes a tilted orientation with respect to the copper oxide surface.