CdSe/SiO_2异质复杂纳米结构的可控制备

Controllable Preparation of Complex CdSe/SiO_2 Heterogeneous Nanostructures

复杂纳米结构至今依然是材料领域研究的前沿。采用简单的气相合成法,通过反应温度选择和初始反应物配方设计,实现了复杂形貌CdSe/SiO2异质纳米结构的可控制备,在直径为100nm左右的一维纳米棒端部成功嫁接了直径约400nm的碗状SiO2纳米空心球。通过XRD,FESEM,HRTEM,EDS和SAED等手段分析试样的形貌、成分和晶体学特征。XRD测试表明,生成产物是CdSe和SiO2的复合材料;EDS分析进一步确认一维纳米棒和碗状空心球的化学成分分别为CdSe和SiO2;HRTEM和SAED测试表明,CdSe纳米棒是沿[0002]方向生长的单晶结构,SiO2纳米空心球为非晶结构。这种新奇的异质纳米结构可以作为未来纳米靶向药物的载体材料。

So far,the complex nanostructures are still forefront in the materials field.Through the selection of reaction temperatures and the formulation design of reactants,the controllable preparation of complex CdSe/SiO2 heterogeneous nanostructures were realized by gas phase synthesis method,and the hollow bowl-shaped SiO2 nano-hemispheres were formed on the tops of the one-dimensional nanorods.The nanorods and the hollow nano-hemispheres are 100 nm and 400 nm in diameter,respectively.The morphology,composition and crystallographic characteristics of the samples were analyzed by XRD,FESEM,HRTEM,EDS and SAED.XRD examination shows that the resultants are CdSe/SiO2 composites.EDS data further confirm that the chemical constituents of one-dimensional nanorods and the hollow bowl-shaped nano-hemispheres are CdSe and SiO2,respectively.HRTEM and SAED measurements indicate that the CdSe nanorods are crystal structures growing along the direction and the SiO2 hollow nano-hemispheres are amorphous structures.These novel heterogeneous nanostructures can be carrier materials of nano-targeted drugs in the future.