中文摘要：

以Stber法制备的SiO2纳米微球为模板,利用二氧化硅模板表面的静电吸附作用,采用层层自组装法,生成厚度可控的硫化镉纳米晶包覆层,制备出CdS包覆SiO2核/壳结构及Mn2＋掺杂CdS核/壳结构纳米球.利用牺牲模板法,以HF为蚀刻剂,还可控制备出CdS空腔纳米结构和Mn2＋掺杂的空腔纳米结构.采用XRD、EPR、TEM、SEM、Uv-Vis和PL等测试手段对所得核/壳与空腔纳米结构的组份及微结构进行分析和表征.Mn2＋掺杂CdS核/壳结构样品的EPR谱可见6条谱线,g因子约在2.002~2.005,这6条超精细结构谱线来自占据Cd2＋格位的Mn2＋离子,可归属于Mn2＋中允许的磁偶极跃迁.Uv-Vis谱分析结果显示CdS空腔结构纳米球的吸收边相比CdS体材料发生很大程度蓝移,且禁带宽度增大.CdS空腔纳米结构的PL谱分析结果表明在530 nm处出现一个较宽的发射带,可归属于CdS空腔纳米结构的表面缺陷态发射;相对于实心纳米结构,CdS空腔纳米结构的荧光强度明显增强.Mn2＋掺杂CdS空腔纳米结构的荧光发射光谱表明,当Mn2＋掺杂量相对于CdS物质的量之比为2.0%时,其荧光强度最大.CdS包覆SiO2核/壳结构及CdS空腔结构纳米材料在光子晶体、生物荧光标记及生物催化等技术领域具有潜在的应用前景。

英文摘要：

SiO2 nanospheres made by St6ber method were used as templates, and core-shell SiO2/CdS was prepared by the electrostatic adsorption on the surface of SiO2 template and the layer-by-layer self-assembled method, which formed a layer of thickness-controlled CdS nanocrystalline coating. CdS hollow structure nanospheres were prepared by sacrificial template method using HF as etching agent. XRD, EPR, TEM, SEM, UV-vis and PL spectrum were used to analyze and characterize the crystal structure, compositional information and morphological structure of the core-shell and hollow nanospheres. 6 spectral lines were observed in the ERP Spectrum and the g factor was about 2.002 to 2.005. These lines come from Mn^2＋ ions that are occupying Cd^2＋ sites, which can be attributed to permissible magnetic dipole transitions in the Mn^2＋. The result of Uv-Vis spectrum showed that Absorption wavelength of CdS hollow nanostructures had a greater degree of blue shift which indicated the quantum confinement effect. The room temperature PL spectrum showed that CdS hollow nanostructures had a broad emission peak centered at 530 nm. So we believed that this peak was due to the trap of surface states. And the fluorescence emission spectra of Mn^2＋ doped hollow structure nanospheres indicated the fluorescence intensity peaked when the ratio of the amount of substance of Mn^2＋ and CdS was 2.0%. SiOJCdS core-shell structure and hollow nanospheres had broad application prospects in fields such as photonic crystal, biological fluorescence labeling and biocatalysis.