科研之友
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摘要
Multifunctional composites based on calcium carbonate (CaCO(3)) spherical microparticles stabilized through the embedding of CdSe/ZnS/SiO(2) nanoparticles into surface pores were fabricated. The stabilization of the vaterite polymorph of CaCO(3) through nanoparticles embedding was necessary to generate a spherical, porous morphology of the microparticles. The CdSe/ZnS quantum dots were obtained and dispersed in aqueous solution after coating them with a silica shell via a reverse microemulsion approach. Green and red-emitting CaCO(3)-CdSe/ZnS/SiO(2) microcomposites were analyzed via confocal laser-scanning fluorescence microscopy were to demonstrate their potential for imaging applications. The acetylcholinesterase (AChE) enzyme was immobilized into the pores of the spherical CaCO(3)-CdSe/ZnS/SiO(2) microcomposites and the resulting hybrid material was used as a platform for the design of a pesticide biosensor. The detection limit for the paraoxon pesticide in aqueous solutions was determined to be of 4.6 nM.
- 出版日期2010
