SnO_2纳米颗粒的制备及其发光性能

Prepared and Photoluminescence of SnO_2 Nanoparticles

用大分子网络凝胶法合成了氧化锡(SnO2)纳米颗粒。X射线衍射(XRD)结果表明,合成的SnO2纳米颗粒具有四方金红石结构,不含任何杂质相。扫描电镜(SEM)观察发现,制得的SnO2纳米颗粒形貌规整、呈类菱形。荧光光谱结果表明,在326 nm波长的光激发下,其荧光光谱由四个主发射带组成,其峰值分别位于379,417,450,470 nm。用230 nm波长的光激发,得到一个740 nm的荧光发射峰。基于实验结果,探讨了纳米SnO2的形成机理和发光机制。

SnO2 nanoparticles were synthesized by a polyacrylamide gel technique.X-ray diffraction(XRD) analysis indicates that the as- synthesized SnO2 nanocrystallites consists merely of a rutile- type SnO2 with tetragonal crystallographic structure.Scanning electron microscope(SEM) observation shows that the prepared SnO2 nanoparticles are regularly rhombus in shape.The photo luminescent emission spectrum detected at λex= 326 nm showed four peaks located at 379,417,450 and 470 nm,the first having the strongest intensity.The emission spectra also show that an emission band around 740 nm was observed when the excitation wavelength is 230 nm.The forming and luminescence mechanisms of nano-SnO2have been discussed based on the experimental results.