Reversible binding and fluorescence energy transfer between surface-derivatized CdS nanoparticles and multi-functionalized fluorescent mesoporous silica nanospheres
Journal
Studies in Surface Science and Catalysis
Journal Volume
170
Journal Issue
B
Pages
1827-1835
Date Issued
2007
Author(s)
Abstract
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 mesopore-entrapped 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. ? 2007 Elsevier B.V. All rights reserved.
SDGs
Type
book part