纳米多级结构枣核型多孔氧化亚铜的合成及拉曼性质

Synthesis and Raman Property of Porous Jujube-Like Cu_2O Hierarchy Structure

通过简单温和的水相还原反应,在表面活性剂十二烷基苯磺酸钠(SDBS)的协同下合成了亚微米级枣核型多孔氧化亚铜纳米多级结构.通过改变盐酸的加入量可以实现纳米粒子尺寸在300-900nm范围可调.X射线衍射(XRD)和透射电子显微镜(TEM)分析表明,亚微米粒子由小于10nm的晶粒构成.基于实验结果,我们提出生长-刻蚀竞争生长模型来解释枣核型空心多孔结构的形成机制,同时说明了尺寸调节机理.利用激光拉曼光谱仪研究了样品的光学性质,与相似尺寸的亚微米实心多面体的拉曼响应信号对比发现,枣核型空心多孔结构的拉曼光谱表现出新颖的特性.这些结果补充了氧化亚铜的拉曼光谱样本,对文物表面颜料的无损拉曼检测具有一定的指导意义.

Structural engineering of nanocrystals is of great importance to control the properties of semiconductor oxides. Here, we present a mild wet chemical reduction route to obtain a sub-micron porous jujube-like Cu2O hierarchy structure. Sodium dodecylbenzene sulfonate （SDBS） is crucial in structural regulation and it acts as a soft template and a capping agent. The jujube-like particle consists of crystal grains less than 10 nm in size as verified by transmission electron microscopy （TEM） and X-ray diffraction （XRD）. A set of time control experiments were carried out to study the evolution of the jujube-like structure. Interestingly, we found that altering the amount of added HCl resulted in a size-tuning effect of changing the size of the particles from approximately 300 to 900 nm. Based on these results, we propose a possible growth-etching competition mechanism to explain the formation of the hollow interior and its porous nature, which also agrees with the sizing-tuning effect. The optical properties were analyzed using Raman spectroscopy. By comparison with a conventional sub-micron solid polyhedral we found a novel Raman property for the porous jujube-like Cu2O. Our research complements the library of Cu2O Raman spectra, which is meaningful for the nondestructive examination of pigments on the surface of antiques by Raman techniques.