Morphology‐ and Color‐Tunable Bright Fibers with High Concentration of CdTe Nanocrystals Assembled through Sol–Gel Reaction

Abstract

Intensely luminescent fibers are prepared by the self‐assembly of hybrid SiO2‐coated CdTe nanocrystals (NCs), SiO2 monomers, and a complex of Cd2+ and thioglycolic acid. These fibers exhibit tunable photoluminescent colors (yellow to red) and morphologies (tubal, solid, and belt‐like) with an extremely high concentration of CdTe NCs by controlling the preparation parameters.

Preparation‐Condition Dependence of Hybrid SiO2‐Coated CdTe Nanocrystals with Intense and Tunable Photoluminescence

“…The TGA concentration and TGA/Cd 2þ molar ratio of the solution were adjusted to ensure that the target properties were obtained as shown in Tables 1 and 2. The resulting samples were finally filtered using a 0.2-mm filter to remove the composite fibers that were created simultaneously during the reflux [15].…”

“…The tunable emission was observed even when the hybrid NCs were incorporated into composite fibers. [15] We have now researched hybrid NCs further, and the results indicate that the PL properties of hybrid NCs depend strongly on the molar ratio and concentration of thioglycolic acid (TGA) and Cd 2þ in the solution. The PL peak wavelength of the hybrid NCs was temperature dependent, and their PL lifetime was longer than that of the initial CdTe NCs.…”

Composite of CdTe quantum dots and molecularly imprinted polymer as a sensing material for cytochrome c

“…First, the QDs and the template were formed complexes through electrostatic interaction, then the monomer (APTES) was added and interacted with the complexes through non-covalent interaction. The tetraethoxysilane (TEOS) was chosen as cross-linker, and after the sol-gel process, the artificial receptor was synthesized (Yang et al, 2009). The resultant composite material of MIP-QDs nanoparticles demonstrated the selective recognition ability for the corresponding template by the changes of fluorescence signal.…”

Morphology-tunable fibers with Fe3O4 nanocrystals fabricated through assembly

“…Recently, composite fibers containing CdTe NCs with bright photoluminescence have been prepared [8,28]. Here, we reported on the first example of morphology-tunable fibers with Fe 3 O 4 NCs by the assembly of Fe 3 O 4 NCs, SiO 2 monomers, and the clusters of Cd 2+ and thiolglycolic acid (TGA) during reflux.…”

“…For example, photosensitive gold NCs were embedded in dielectric (SiO 2 ) nanowires for the application in ultrafast all-optical switching devices owing to their enhanced third-order nonlinear susceptibility, especially near the surface-plasmon-resonance frequency [7]. Luminescent CdTe NCs were encapsulated in cadmium thiolate composite fibers with tunable morphology and luminescence [8][9][10][11]. These fibers are a good candidate for bio-label and luminescent devices.…”