CAJ | 학술논문

采用溶剂热法制备了Mn离子掺杂的ZnS纳米粒子(ZnS:Mn),然后利用正硅酸乙酯(TEOS)的水解反应对其进行了不同厚度的SiO_2无机壳层包覆.采用X射线衍射(XRD)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)及荧光发射光谱(PL)对样品的结构及光学性质进行了表征和研究.包覆SiO_2壳层后,粒子的粒径明显增大并且在ZnS:Mn纳米粒子表面可以观察到明显的SiO_2壳层.XPS测试印证了ZnS:Mn/SiO_2的核壳结构.随着SiO_2壳层的增厚,ZnS:Mn/SiO_2的Mn离子的发光先增强后减弱,这是因为SiO_2壳层同时具有表面修饰和降低发光中心浓度这两种相反的作用.当壳层厚度(壳与核的物质的量的比)达到5时,发光效果达到最好,其强度达到未包覆样品的7.5倍.
채용용제열법제비료Mn리자참잡적ZnS납미입자(ZnS:Mn),연후이용정규산을지(TEOS)적수해반응대기진행료불동후도적SiO_2무궤각층포복.채용X사선연사(XRD)、투사전자현미경(TEM)、X사선광전자능보(XPS)급형광발사광보(PL)대양품적결구급광학성질진행료표정화연구.포복SiO_2각층후,입자적립경명현증대병차재ZnS:Mn납미입자표면가이관찰도명현적SiO_2각층.XPS측시인증료ZnS:Mn/SiO_2적핵각결구.수착SiO_2각층적증후,ZnS:Mn/SiO_2적Mn리자적발광선증강후감약,저시인위SiO_2각층동시구유표면수식화강저발광중심농도저량충상반적작용.당각층후도(각여핵적물질적량적비)체도5시,발광효과체도최호,기강도체도미포복양품적7.5배.
Mr-doped ZnS nanopatricles synthesized by solvothermal method were successfully coated with SiO_2 shells of various thicknesses by hydrolysis reaction of tetraethyl orthosilicate (TEOS).The samples were characterized by X-ray diffraction (XRD),transmission electron microscopy images (TEM),X-ray photoelectron spectroscopy (XPS) and the room temperature photoluminescence (PL) spectra When the ZnS:Mn nanoparticles were coated with SiO_2 shells,an obvious increase in particle size and a clear shell of SiO_2 can be observed.The XPS measurement also gave the evidence for the core/shell structure of ZnS:Mn/SiO_2 nanoparticles.Because the surface modification effect and the decrease in luminescent centers effect are concurrent in the SiO_2 shells,the Mn emission intensity first increased and then decreased with the thickening of the SiO_2 shell The intensity,which attained its maxium at 5 shell thickness,was as 7 times as that for the bare.ZnS,Mn nanoparticles.