Tb(Ⅲ)与PNIPAM接枝核壳纳米微球相互作用的研究  

Study on the Interaction between Tb(Ⅲ) and PNIPAM Grafted Core-Shell Nanoparticles

作　　者：殷伟庆[1] 陈明清 陆天虹[2] MITSURU Akashi 黄晓华[1] 

机构地区：[1]江南大学化学与材料工程学院,无锡214036 [2]南京师范大学化学与环境科学学院材料科学重点实验室 [3]大阪大学工学部分子化学系

出　　处：《化学学报》2006年第20期2127-2131,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20471030);江苏省高新技术项目(BG2005040)资助项目.

摘　　要：利用透射电镜、X射线光电子能谱、动态激光光散射和荧光光谱技术对Tb(Ⅲ)与聚N-异丙基丙烯酰胺(PNIPAM)接枝核壳纳米微球PNIPAM-g-P(NIPAM-co-St)(PNNS)的相互作用进行了研究.结果表明:Tb(Ⅲ)和热敏性的核壳纳米微球PNNS有显著的相互作用.其一,Tb(Ⅲ)可与PNNS中酰胺基团上的氧原子配位形成微球配合物Tb(Ⅲ)-PNNS;其二,Tb(Ⅲ)-PNNS微球配合物兼具热敏性;其三,该配合物在545nm处的荧光强度较Tb(Ⅲ)增大了233倍,Tb(Ⅲ)与PNNS分子间能量传递达到50%,当Tb(Ⅲ)质量分数为12%时荧光强度最大.The interaction between poly（N-isopropylacrylamide） PNIPAM grafted core-shell nano particles PNIPAM-g-P（NIPAM-co-St） （PNNS） and Tb（Ⅲ） core-shell nanoparticles was characterized by transmission electron microscopy （TEM）, X-ray photoelectron spectroscopy （XPS）, dynamic light scattering （DLS） and fluorescence spectroscopy. It was found that there is a strong interaction between Tb（Ⅲ） and PNNS core-shell nanoparticles. Firstly, Tb（Ⅲ） mainly bonded to atom O of the carbonyl groups of PNNS to form the complex of Tb（Ⅲ）-PNNS. Secondly, the Tb（Ⅲ）-PNNS complex had the temperature responsive property. Thirdly, the maximum emission intensity of the complex at 545 nm was enhanced about 223 times compared to that of the pure Tb（Ⅲ）. The intramolecular energy transfer efficiency from PNNS to Tb（Ⅲ） reached 50%. When the mass fraction of Tb（Ⅲ） was 12%, the enhancement of the emission fluorescence intensity at 545 nm was the highest.

关 键 词：聚N-异丙基丙烯酰胺 Tb(Ⅲ) 低临界溶解温度 XPS 能量传递 

分 类 号：O631.3[理学—高分子化学]