We report the preparation and structural characterization of core/shell CdSe/CdS/ZnS nanorods. A graded shell of larger band gap is grown around CdSe rods using trioctylphosphine oxide as a surfactant. Interfacial segregation is used to preferentially deposit CdS near the core, providing relaxation of the strain at the core/shell interface. The reported synthesis allows for variation of the she...

In this work, we investigate the thermal evolution of CdSe-CdS-ZnS core-multishell quantum dots (QDs) in situ using transmission electron microscopy (TEM). Starting at a temperature of approximately 250 °C, Zn diffusion into inner layers takes place together with simultaneous evaporation of particularly Cd and S. As a result of this transformation, CdxZn1-xSe-CdyZn1-yS core-shell QDs are obtained.

A new hybrid photoelectrochemical photoanode is developed to generate H2 from water. The anode is composed of a TiO2 mesoporous frame functionalized by colloidal core@shell quantum dots (QDs) followed by CdS and ZnS capping layers. Saturated photocurrent density as high as 11.2 mA cm-2 in a solar-cell-driven photoelectrochemical system using near-infrared QDs is obtained.

This paper deals with the role played by interface and bulk volume of nanofiller about affecting electrical properties a nanocomposite material. For this purpose, simple completely amorphous matrix, polystyrene (PS), is used as base material, core-shell quantum dots are exploited for simulating structure nanocomposites: CdSe core CdSe-ZnS semiconductor (QDs) added into PS matrix. The latter to ...

Resonance Raman spectra and absolute cross sections of InP/ZnSe/ZnS core/shell/shell nanocrystals have been obtained at excitation wavelengths 501.7, 457.9, 410 nm. Eight different structures having nearly the same lowest excitonic absorption wavelength but significantly stoichiometries are compared. The show phonon features attributable to both InP core ZnSe shell. largest differences among se...

Photoluminiscent (PL) cellulose aerogels of variable shape containing homogeneously dispersed and surface-immobilized alloyed (ZnS)x(CuInS2)1-x/ZnS (core/shell) quantum dots (QD) have been obtained by (1) dissolution of hardwood prehydrolysis kraft pulp in the ionic liquid 1-hexyl-3-methyl-1H-imidazolium chloride, (2) addition of a homogenous dispersion of quantum dots in the same solvent, (3) ...

Highly photoluminescent and water dispersible ternary alloyed Mn-doped ZnSeS core/shell Mn:ZnSeS/ZnS quantum dots (QDs) with pure dopant emission were synthesized through a simple aqueous route using thiolactic acid (2-MPA) as capping ligand. Transmission electron microscopy X-ray diffraction show that Mn:ZnSeS nanocrystals are of spherical shape, diameter 2.4 nm cubic zinc blende structure. Wi...

Zinc sulfide films were grown on carboxyl-modified polystyrene microspheres (PS-CO2) through sonochemical deposition in an aqueous bath containing zinc acetate and sulfide, released through the hydrolysis of thioacetamide. The resulting particles were “optically hollow”, due to a large refractive index contrast between the core and shell materials. Continuous, uniform films were obtained after ...

Three quantum dot luminescent solar concentrators (QDLSCs) are constructed to assess their performance in an outdoor environment over entire year. The QDLSCs have a 45 × 50 1.2 cm 3 PMMA-Kraton-PMMA sandwich structure with either InP/ZnSe/ZnS, CuInS 2 / ZnS , or CdSe/CdS/ZnS core/shell dots incorporated the Kraton interlayer. Furthermore, two reference LSCs included: one using Lumogen F Red 305...