【作者】 张玉娜；

【导师】 魏柳荷； 李占先； 于明明；

【作者基本信息】 郑州大学 ， 物理化学， 2010， 硕士

【摘要】 本论文简要介绍了树枝状共轭聚合物和金复合纳米粒子的进展和主要应用。利用环戊二烯酮与炔基的Diels-Alder加成反应,成功制备了外缘带活性官能团的树枝状共轭化合物。一方面经化学修饰后得到硫醇作为金纳米粒子的有机保护层,得到尺寸可控、窄分布的树枝化聚苯/金的核壳结构的复合纳米粒子；另一方面经过进一步的反应,得到希夫碱作为铬的荧光探针。详细讨论了各种因素对反应的影响。用核磁共振氢谱和红外光谱对各步骤的产物进行了表征,证实了实际得到产物的结构。用紫外-可见光谱和透射电镜对金复合纳米粒子的形貌进行了表征。用紫外-可见光谱和荧光光谱对荧光探针的性能进行了评价。树枝化聚苯刚硬、能够保持形状、热稳定性和光化学稳定性好,还是发蓝光的材料。以结构规整的树枝化聚苯作为保护有机层制备金纳米粒子,将金纳米粒子限制在固定的空间里,从而有效地避免金纳米颗粒之间的团聚。同时,选择共轭的树枝化聚苯作为荧光探针,可以增强荧光强度,提高敏感性,达到了识别金属离子的目的。更多还原

【Abstract】 This paper briefly described the progress and main applications of dendritic conjugated polymer and gold nanoparticles. Conjugated polybenzene with active groups was successfully synthesized via Diels-Alder addition reaction between cyclopentadienone and alkynyl compound. On one hand, dendritic polybenzene-gold composite nanoparticles with narrow size distribution were prepared. The size and morphology of the composite nanoparticles were controllable. On the other hand, after further chemical modification of the dendritic polybenzene, fluorescent probe of chromium were synthesized. The impact of various factors on the modification process was discussed in detail.1H-NMR, and FTIR were used to characterize the structure of the designed compounds. TEM was used to characterize the size and morphology of the composite nanoparticles. UV-vis and FL spectroscopies were used to characterize opitical properties of the compound and the composite nanoparticles. The designed rigid polybenzene was photo-stable and thermal-stable, and it was also a blue light-emitting material. With this polybenzen as protective layer, the gold nanoparticles were restricted to a fixed space and agglomeration was effectively avoided. Meanwhile, choosing dendritic polymer as a fluorescent probe, could enhance the fluorescence intensity and increase sensitivity for the purpose of identification of metal ions.更多还原