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OALib Journal期刊
ISSN: 2333-9721
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具有温度敏感和智能荧光特性的聚合物包覆金纳米粒子的研究
DOI: 10.11777/j.issn1000-3304.2015.14319, PP. 451-458
Keywords: 金纳米粒子,聚N-异丙基丙烯酰胺,温敏性,智能荧光
Abstract:
以4-二甲氨基吡啶稳定的金纳米粒子(DMAP-AuNPs)为前驱体,通过与端基含二甲氨基查尔酮的聚N-异丙基丙烯酰胺(PNIPAM-DMAC)进行配体置换,制备了具有温度敏感和智能荧光特性的PNIPAM-DMAC聚合物包覆的金纳米粒子(PNIPAM-AuNPs),并通过紫外可见吸收光谱、透射微镜、核磁共振氢谱、红外光谱和热重分析仪对其形貌和结构进行了分析和表征.PNIPAM-AuNPs能够很好地分散在水、乙醇、丙酮、氯仿和四氢呋喃中,其表面等离子共振(SPR)吸收特征波长分别为537、527.6、527.4、532.2和530.4nm.PNIPAM-AuNPs的表面聚合物接枝密度为1~2条聚合物链/nm2.温敏性结果表明,PNIPAM-AuNPs具有低临界溶解温度(LCST),其LCST温度比相应的PNIPAM-DMAC聚合物低2.5K;在PNIPAM-AuNPs发生相转变前后,金纳米粒子的SPR特征峰由537nm蓝移至525nm处.荧光性能研究表明,随着溶剂极性的增加,PNIPAM-AuNPs的荧光特征波长发生红移,荧光强度先增加后减小,具有极性敏感的荧光特性;在25℃时,PNIPAM-AuNPs水溶液几乎无荧光,而当温度升高到45℃后,荧光强度显著提高,表现出温度"开/关"的荧光特性.
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