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以超支化聚合物囊泡为模板制备了贵金属纳米颗粒表面功能化的杂化囊泡.模板囊泡通过多巴胺修饰的超支化聚醚HSP-DA在水中自组装形成.在碱性条件下,囊泡表面的多巴胺自聚合生成聚多巴胺,实现囊泡的交联.由于聚多巴胺具有强黏附特性,因此可以将HSP-PDA交联囊泡分别与Au纳米溶胶、Ag纳米溶胶直接混合,得到Au纳米颗粒或Ag纳米颗粒功能化的杂化囊泡.分别测定了2种杂化囊泡的拉曼光谱,发现杂化囊泡产生了明显的表面增强的拉曼光谱(SERS)信号,清晰显示了对应于囊泡模板分子的拉曼信号,表明可以通过SERS来原位检测囊泡的组成.Ag纳米颗粒杂化囊泡展示出更高的SERS灵敏度,可进一步作为探针检测水中浓度为10-7mol/L罗丹明6G分子,得到了显著增强的拉曼光谱,证明所制备的Ag纳米颗粒杂化囊泡可用于目标分子的痕量检测.
Hyperbranched polymer vesicles were used as templates to prepare functionalized hybrid vesicles on the surface of noble metal nanoparticles.The template vesicles were self-assembled in water by dopamine-modified hyperbranched polyether HSP-DA.Under alkaline conditions, vesicles Because of the strong adhesion of polydopamine, the cross-linked vesicles of HSP-PDA can be directly mixed with Au nano-sol and Ag nano-sol respectively to obtain Au nano Particles or Ag nanoparticles functionalized hybrid vesicles were measured Raman spectra of the two kinds of hybrid vesicles, hybrid vesicles were found to produce significant surface enhanced Raman spectroscopy (SERS) signal, clearly shows the The Raman signal corresponding to the vesicle template molecule indicates that the vesicle composition can be detected in situ by SERS.Ag nanoparticle hybrid vesicles exhibit higher SERS sensitivity and can be further used as a probe to detect water concentrations of 10- 7mol / L rhodamine 6G molecules, a significantly enhanced Raman spectrum was obtained, demonstrating that the prepared Ag nanoparticle hybrid vesicles can be used for trace detection of target molecules.