ZnS包覆SiO_2核壳和空腔结构纳米球制备研究

Preparation of Core-shell SiO_2/ZnS and Hollow Nanospheres

ZnS包覆SiO_2三维核壳结构或空腔结构纳米球可用于光子晶体的组装.本实验采用层层自组装法,利用二氧化硅模板表面的静电作用吸附纳米晶粒子,生成纳米晶包覆层,制备核壳结构的SiO_2@ZnS和SiO_2@ZnS:Mn^(2+)纳米球.控制氢氟酸对二氧化硅的蚀刻程度,制备了空腔型硫化锌纳米球.采用XRD、UV、PL、TEM、SEM、AFM等测试手段对核壳结构和空腔型硫化锌纳米球进行了表征.结果表明ZnS纳米晶包覆SiO_2后,在其表面形成了包裹紧密、形貌规整、粒径均一的ZnS壳层;经5%氢氟酸蚀刻得到的空腔纳米球结构完好、厚度均匀.

SiO2 coated by ZnS nanocrystalline three-dimensional core-shell or hollow nanospheres can be used as building blocks for photonic crystals. To produce these particular three-dimensional nano-materials, a layer-by-layer self-assembled method was used. The electrostatic on the surface of nanometer SiO2 templates could absorb ZnS nanocrystal and form a layer of thickness-controlled shell. The hollow nanospheres were produced by 5% hydrofluoric acid etched the SiO2 templates. The coreshell structure and hollow nanospheres were verified by XRD, UV, PL, TEM, SEM and AFM. The results indicate that after the SiO2 is coated by ZnS nanocrystalline, the core-shell surface is close and neat, and the particle size is homogeneous. The configuration of ZnS hollow nanospheres is intact, and the thickness is well-distributed.