sn掺杂zno纳米阵列的水热合成.doc

Sn 掺杂 ZnO 纳米阵列的水热合成关键词:ZnO 纳米晶; 水热合成; Sn 掺杂; 光学性能 Hydrothermal synthesis of Sn doped ZnO nano array Abstract:Sn-doped ZnO nanocrystals were synthesized by the hydrothermal method using ZnCl2 and NaOH as rawmaterials at 200e for 5 h. The dopant source of tin was SnCl4 · 4H2O and the atomic percent age of dopant in the solution were n(Sn):n(Zn) = 1% and 2% respectively. The position, morphology,size as well as optica lproperties of the sampls have been characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), UV-Visible absorption and photo lum in escence (PL) spectra. The effects of the Sn doping concentration and the pH value of the precursor solution on the surface morphology and optical properties of the samples have also been studied. The experimental results indicate that the obtained Sn-doped ZnO nanocrystals are of hexagonalw urtzite structure. The average grain size of the samples increases and the surface morphology goes from short rod-like to single cone-like and double cone-like with the increase ofSn concentration. In addition, the surfacemorphology of the samples can also be affected by the basicity of the precursor solution. Since it changes from long rod-like (for pH 7. 0) to short rod-like (forpH 12. 0). There was aUV absorption peak from theUV-visible absorption spectra which have a red-shift with the increase of Sn concentration. Three photoluminescence bands, including a strong purple emission at 433 nm, a lef-t shoulder nearUV band emission around 401 nm aswell asa weak blue emission at 466 nm were observed at room temperature. The intensities of the emission peaks increased with the increase of Sn concentration. Compared with that of undoped ZnO nanocrysta,l only the intensities of emission peaks are changed, but the peak positions are almost not changed in the Sn doping concentration rang of our experiments. Key words:ZnO nanocrysta;l hydrothermal synthesis; Sn-doping; optical properties .....