Eu(Ⅲ)-PNVA-co-PSt纳米微球的光学性能研究  

Preparation and Spectroscopic Properties of Eu(Ⅲ)-PNVA-co-PSt Nanospheres

作　　者：孙雨薇 倪忠斌 傅成武 黄晓华[1,2] 陈明清 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122 [2]南京师范大学化学与环境科学学院,江苏南京210097

出　　处：《稀土》2009年第4期16-20,共5页Chinese Rare Earths

基　　金：国家自然科学基金项目资助(20671043);江苏高等学校优秀科技创新团队项目资助(苏教科[2007]5号)

摘　　要：由无皂种子乳液聚合法合成了以疏水性聚苯乙烯(PSt)为核、亲水性聚N-乙烯基乙酰胺(PNVA)为壳的PNVA-co-PSt共聚物纳米级微球,进而将一定量的Eu3+与微球中的PNVA配位,得到了Eu(Ⅲ)-PNVA-co-PSt微球配合物。用透射电子显微镜(TEM)、Zeta-电位、红外光谱、紫外光谱以及荧光光谱分别对微球及其配合物的相关性质进行了表征。TEM观察发现,微球在与Eu3+配位前后保持规则的球形结构,有较好的单分散性;红外、紫外光谱测定表明,在Eu(Ⅲ)-PNVA-co-PSt微球配合物中Eu3+与PNVA链上的氧原子和氮原子发生配位作用;荧光光谱显示,Eu(Ⅲ)-PNVA-co-PSt配合物受到260nm波长的紫外光激发后,在584nm和612nm处产生增强的Eu3+的特征发射峰,说明在Eu3+与PNVA-co-PSt微球之间能够发生有效的F rster能量传递,这为拓宽稀土的应用提供了新的途径。The poly（N-vinylacetamide）-co-polystyrene（PNVA-co-PSt） nanospheres with PSt as core and PNVA as shell were synthesized by soap free seed emulsion copolymerization using PSt nanospheres in ethanol-water mixed solvents（Vethanol∶Vwater=1∶2） in the presence of St and NVA monomer.The Eu（Ⅲ）-PNVA-co-PSt complex was obtained by coordination reaction of PNVA-co-PSt nanospheres with Eu3＋ in ethanol.The PNVA-co-PSt nanospheres and its complex were then characterized by transmission electron microscopy,zeta-potential,FTIR spectroscopy,UV spectroscopy and fluorescence spectroscopy.The diameter of resulting nanospheres with nice sphere structure is about 500nm and narrow distribution.It was observed that Eu3＋ were bonded to carbonyl oxygen or nitrogen atom in PNVA-co-PSt nanospheres from the FTIR and UV spectra.The absorption capability of Eu（Ⅲ）-PNVA-co-PSt complex for the ultraviolet ray is improved greatly and the maximum emission intensity of Eu（Ⅲ）-PNVA-co-PSt nanospheres at 612nm（characteristic emission peak of Eu3＋） is enhanced about 23.4 times compared with EuCl3.It demonstrated that there exists efficient Frster energy transfer from PNVA-co-St nanospheres to Eu3＋.

关 键 词：核壳纳米微球 Eu3+ 紫外光谱 荧光光谱 

分 类 号：O482.31[理学—固体物理] O614.31[理学—物理]