摘要
采用静电逐层自组装的方法,首先将PSS和PAH聚电解质交替沉积在CaCO3中空微球表面,然后将Fe3O4磁性纳米粒子与CdSe量子点负载在中空微球表面不同的聚电解质层中,制备出具有磁性和荧光双重功能的复合微球,并将其作为荧光离子探针,研究了其对Cu2+和Pb2+离子检测的灵敏度、选择性及可行性。结果表明,复合微球显示出良好的磁性和荧光性能,对Cu2+和Pb2+离子的检测具有较高的灵敏度和选择性。尤为重要的是,可通过磁分离的方法将微球快速地从待测液中回收,从而能够避免量子点对环境造成的二次污染。
Magnetic fluorescence composite microspheres were fabricated through a layer-by-layer electrostatic self-assembly method. Polyelectrolyte layers were firstly assembled onto the CaCO3 hollow microspheres by the sequential deposition of the PSSand PAHpolyelectrolyte. And then Fe3O4 nanoparticles and CdSe quantum dots were simultaneously assembled onto the hollow microspheres. Furthermore, the resulting magnetic fluorescence composite microspheres were utilized as a chemosensor for the detection of Cu2＋ and Pb2＋ in aqueous solutions. The results showed that the composite microspheres exhibited strong fluorescence and magnetism, high sensitivity and selectivity towards Cu2＋ and Pb2＋. Most importantly, it is easy to separate and recycle the composite microspheres from the detection solution using a commercial magnet, thus avoiding secondary contamination and promoting the practical applications of quantum dots.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2014年第2期303-309,共7页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.50702037)
上海市自然科学基金(No.13ZR1444200)
中央高校基本科研业务费专项基金资助项目
关键词
磁性纳米粒子
CDSE量子点
中空微球
静电逐层自组装
重金属检测
magnetic nanopatieles
CdSe quantum dots
hollow microsphere
layer-by-layer electrostatic self-assembly
heavy ionsdetection
