Reversible binding and fluorescence energy transfer between surface-derivatized CdS nanoparticles and multi-functionalized fluorescent mesoporous silica nanospheres
A MCM-41 types of Mesoporous Silica Nanosphere material (MSN) covalently anchored with a fluorescent dye (Texas Red ) is synthesized. The Texas-Red-doped MSNs is also functionalized with a second organic group, i.e., mercaptopropyl or aminopropyl functionalities. These organic groups of the resulting bifunctional MSNs are utilized as reversible linkers to entrap two corresponding surface-derivatized cadmium sulfide (CdS) nanoparticles. The kinetics of encapsulation and release as well as the photophysical properties of the photoluminescent quantum dots and the MSN composites are investigated by examining the fluorescence resonance energy transfer between the two species. We demonstrated that the fluorescence energy transfer between CdS and Texas Red molecules can be “switched off by chemically cleaving the covalent linkage between the mesoporeentrapped CdS and the fluorescent MSN. Our results indicated that these MSN materials provided with proper pore-surface functional groups could serve as reversible hosts to entrap and release surface-derivatized cadmium sulfide nanoparticles.
C.-Y. Lai C.-W. Wu D. R. Radu B. G. Trewyn V. S.-Y. Lin
Department of Chemistry, U.S. DOE Ames Laborartory, Iowa State University, Ames, Iowa,50011-3111, USA
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）