Size-Dependent Non-FRET Photoluminescence Quenching in Nanocomposites Based on Semiconductor Quantum Dots CdSe/ZnS and Functionalized Porphyrin Ligands
Figure 1
Schematic presentation of “QD-porphyrin” nanostructures (a) an optimized geometry for Cd33Se33 + H2P(m-Pyr)2, ((b) optimization by HyperChem 7.0; simulations by ab initio density functional theory, DFT, with the VASP code [66]) and the scales of CdSe core, ZnS shell, porphyrin, and TOPO molecules corresponding to relative sizes of the main components of the arrays, (c) the ZnS shell thickness for QDs was estimated on the basis of the thickness of one ZnS layer Å; parameters for conical TOPO molecules Å, Å; Å is the radius of porphyrin molecule with opposite pyridyl rings having nitrogens in metapositions, Å is the mean distance between metanitrogens of adjacent pyridyl rings (HyperChem 4.0, semiempirical method PM3).
