湖北大学学报（自然科学版）
湖北大學學報（自然科學版）
호북대학학보（자연과학판）
2015年
3期
257-261
,共5页
CdS%核/壳结构%空腔纳米球%光致发光
CdS%覈/殼結構%空腔納米毬%光緻髮光
CdS%핵/각결구%공강납미구%광치발광
cadmium sulfide%core-shell structure%hollow nanosphere%fluorescent
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.①
以St?ber法製備的SiO2納米微毬為模闆，利用二氧化硅模闆錶麵的靜電吸附作用，採用層層自組裝法，生成厚度可控的硫化鎘納米晶包覆層，製備齣CdS包覆SiO2覈/殼結構及Mn2+摻雜CdS覈/殼結構納米毬.利用犧牲模闆法，以HF為蝕刻劑，還可控製備齣CdS空腔納米結構和Mn2+摻雜的空腔納米結構.採用XRD、EPR、TEM、SEM、Uv-Vis和PL等測試手段對所得覈/殼與空腔納米結構的組份及微結構進行分析和錶徵.Mn2+摻雜CdS覈/殼結構樣品的EPR譜可見6條譜線，g因子約在2.002~2.005，這6條超精細結構譜線來自佔據Cd2+格位的Mn2+離子，可歸屬于Mn2+中允許的磁偶極躍遷. Uv-Vis譜分析結果顯示CdS空腔結構納米毬的吸收邊相比CdS體材料髮生很大程度藍移，且禁帶寬度增大.CdS空腔納米結構的PL譜分析結果錶明在530 nm處齣現一箇較寬的髮射帶，可歸屬于CdS空腔納米結構的錶麵缺陷態髮射；相對于實心納米結構，CdS空腔納米結構的熒光彊度明顯增彊.Mn2+摻雜CdS空腔納米結構的熒光髮射光譜錶明，噹Mn2+摻雜量相對于CdS物質的量之比為2.0%時，其熒光彊度最大.CdS包覆SiO2覈/殼結構及CdS空腔結構納米材料在光子晶體、生物熒光標記及生物催化等技術領域具有潛在的應用前景.①
이St?ber법제비적SiO2납미미구위모판，이용이양화규모판표면적정전흡부작용，채용층층자조장법，생성후도가공적류화력납미정포복층，제비출CdS포복SiO2핵/각결구급Mn2+참잡CdS핵/각결구납미구.이용희생모판법，이HF위식각제，환가공제비출CdS공강납미결구화Mn2+참잡적공강납미결구.채용XRD、EPR、TEM、SEM、Uv-Vis화PL등측시수단대소득핵/각여공강납미결구적조빈급미결구진행분석화표정.Mn2+참잡CdS핵/각결구양품적EPR보가견6조보선，g인자약재2.002~2.005，저6조초정세결구보선래자점거Cd2+격위적Mn2+리자，가귀속우Mn2+중윤허적자우겁약천. Uv-Vis보분석결과현시CdS공강결구납미구적흡수변상비CdS체재료발생흔대정도람이，차금대관도증대.CdS공강납미결구적PL보분석결과표명재530 nm처출현일개교관적발사대，가귀속우CdS공강납미결구적표면결함태발사；상대우실심납미결구，CdS공강납미결구적형광강도명현증강.Mn2+참잡CdS공강납미결구적형광발사광보표명，당Mn2+참잡량상대우CdS물질적량지비위2.0%시，기형광강도최대.CdS포복SiO2핵/각결구급CdS공강결구납미재료재광자정체、생물형광표기급생물최화등기술영역구유잠재적응용전경.①
SiO2 nanospheres made by St?ber 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 Mn2+ions that are occupying Cd2+sites,which can be attributed to permissible magnetic dipole transitions in the Mn2+. 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 Mn2+doped hollow structurenanospheres indicated the fluorescence intensity peaked when the ratio of the amount of substance of Mn 2+and CdS was 2.0%. SiO2/CdS core-shell structure and hollow nanospheres had broad application prospects in fields such as photonic crystal,biological fluorescence labeling and biocatalysis.
