摘要:
利用532nm脉冲激光对沉浸在去离子水及十二烷基硫酸钠（SDS）水溶液中的金属锌靶进行液相激光烧蚀,合成了ZnO纳米颗粒和Zn/ZnO核壳结构的纳米粒子.应用X射线衍射仪,透射电子显微镜,紫外可见光分光光度计和荧光光度计表征产物的微观结构和光学性能,并探讨其形成机理.结果表明：在去离子水中分别烧蚀2h和4h生成的ZnO纳米粒子的平均粒径分别为43nm和19nm.激光的长时间作用可以使纳米粒子粒径减小.在0.005mol/L的SDS水溶液中合成了Zn/ZnO核壳结构的纳米粒子,这是由于SDS的包裹作用而造成的.所得ZnO和Zn/ZnO纳米胶体溶液在蓝光区450nm（2.76eV）和绿光区558nm（2.22eV）处有发光峰.
Abstract:
ZnO nanoparticles and Zn/ZnO core/shell structured nanoparticles are synthesized by ablating zinc target in deionized water and sodium dodecyl sulfate （SDS） solutions, respectively, using pulsed laser ablation with 532 nm pulsed infrared laser. The microstructures and photoluminescence properties of the products are characterized by X-ray diffraction, transmission electron microscopy, ultraviolet-visible and PL spectrophotometer. The formation mechanism of ZnO and Zn/ZnO nanoparticles is discussed. The results show that the mean diameters of ZnO nanoparticles are 43 nm and 19 nm, respectively, after ablating the zinc target for 2 and 4 hours in deionized water. The longer-time ablation may lead to the interaction of the ablating laser beam with the ZnO nanoparticles, resulting in the decrease of the mean diameter of ZnO. Zn/ZnO core/shell structured nanoparticles can be obtained in 0.005 mol/L SDS solution due to the enwrapping of SDS to the Zn nanoparticles. A blue photoluminescence at about 450 nm （2.76 eV） and a green one at about 558 nm （2.22 eV） are observed for the colloidal solutions of ZnO and Zn/ZnO nanoparticles.
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