聚集诱导发光超分子聚合物的光物理性能研究

发布时间：2018-02-12 01:48

本文关键词： 聚集诱导发光超分子聚合物能量传递纳米球　出处：《高分子学报》2017年01期 　论文类型：期刊论文

【摘要】：将一种含具有聚集诱导发光性能(AIE)的四苯乙烯的2-脲基-4[1H]-嘧啶酮衍生物(TPE-bis UPy)在氯仿中通过四重氢键作用组装形成的超分子聚合物,再以十六烷基三甲基溴化铵(CTAB)为表面活性剂利用微乳法制备了基于超分子聚合物的纳米球.这种纳米球的形貌通过SEM进行了表征,具有规整的形貌与尺寸.相比在溶液里,该超分子聚合物纳米球的荧光显著增强.通过改变单体的浓度得到了3种不同粒径的超分子聚合物纳米球,DLS表征其粒径分别为46、66和91 nm.将这3种不同粒径的TPE-bis UPy超分子聚合物纳米小球与带负电的曙红(EY)进行组装,由于静电相互作用曙红吸附在纳米球表面,拉近了TPE-bis UPy和曙红之间的距离,使得在组装体内TPE-bis UPy可以有效地将激发能传递给曙红分子,该体系的发光颜色从蓝色荧光变为黄绿色荧光,其能量传递效率分别为62%、55%和39%,洗去表面活性剂CTAB后静电作用减弱,能量传递效率显著降低,分别为46%、36%和33%.研究表明,TPE-bis UPy超分子聚合物纳米小球与曙红的组装体系内,静电作用越强能量传递效率越高;超分子聚合物纳米球粒径越小,能量传递效率越高;并且通过这种组装可以调控体系的发光颜色,能量传递也可以通过体系的发光颜色变化观察到.
[Abstract]:A supramolecular polymer composed of 2-urea-4 [1H] -pyrimidinone derivative containing tetrastyrene with agglomeration induced luminescence (AIEs) was assembled in chloroform by quadruple hydrogen bonding. Using cetyltrimethylammonium bromide (CTAB) as surfactant, nanospheres based on supramolecular polymers were prepared by microemulsion method. The morphology of the nanospheres was characterized by SEM. The fluorescence of the supramolecular polymer nanospheres was significantly enhanced. By changing the monomer concentration, three kinds of supramolecular polymer nanospheres with different diameters were obtained. The diameters were 466 and 91 nm, respectively. The TPE-bis UPy with three different diameters were obtained. The supramolecular polymer nanoparticles were assembled with a negatively charged eosin EY. Because the electrostatic interaction eosin adsorbs on the surface of the nanospheres, the distance between TPE-bis UPy and eosin is reduced, so that TPE-bis UPy can effectively transfer the excitation energy to eosin molecules in the assembled body. The luminescence color of the system changed from blue fluorescence to yellow-green fluorescence. The energy transfer efficiency of the system was 6255% and 39%, respectively. The electrostatic effect of the surfactant CTAB was weakened and the energy transfer efficiency decreased significantly after washing the surfactant CTAB. The results show that the higher the electrostatic action, the higher the energy transfer efficiency, the smaller the particle size, the higher the energy transfer efficiency of TPE-bis UPy supramolecular polymer nanospheres and eosin. The luminous color of the system can be regulated by this assembly, and the energy transfer can also be observed by the change of the luminous color of the system.
【作者单位】：中北大学理学院;中国科学院理化技术研究所光化学转换与功能材料重点实验室;北京师范大学化学学院;
【基金】：国家自然科学基金(基金号21474124,21272243;21525206) 国家重点基础研究发展计划(973计划,项目号2013CB933800)资助项目
【分类号】：O631

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