Semiconductor nanostructures capable of emitting from two excited states and thereby of producing two photoluminescence colours are of fundamental and potential technological significance. In this limited class of nanocrystals, CdSe/CdS core/arm tetrapods exhibit the unusual trait of two-colour (red and green) multiexcitonic emission, with green emission from the CdS arms emerging only at high ...

Integration of noble metals into semiconductor-based nanoparticle gel structures facilitates the extraction photoexcited charge carriers upon illumination. While carrier generation takes place in semiconductor component, contact to act as electron sinks. Thus, nature interface between components is essential importance, it dictates characteristics interparticle contact. Here, influence nanoscal...

Laboratory wastes containing Cd2+ and water polluted by pharmaceuticals represent an environmental concern. In this work, a proof concept, consisting of the use teaching-laboratory to synthesize CdS its subsequent as photocatalyst degrade fluoroquinolone antibiotics, was developed. The prepared extraction with thioacetamide calcination (at 450 °C) characterized using several techniques. photoca...

In this work, the effects of Si-doping in Cu2ZnSnS4 are examined computationally and experimentally. The density functional theory calculations show that an increasing concentration Si (from x = 0 to 1) yields a band gap rise due shifting conduction minimum towards higher energy states Cu2Zn(Sn1−xSix)S4. CZTSiS thin film prepared by co-sputtering process shows Cu2Zn(Sn1−xSix)S4 (Si-rich) (S-ric...

A wide range of biomineralization and templating methods exist for organizing inorganic materials at a wide range of length-scales. Here, we show that crystallographic control of the inorganic nanostructures is possible using synthetic biomolecular templates comprised of anionic DNA and cationic membranes, which self-assemble into a multilamellar structure where a periodic one-dimensional (1D) ...

The effect of semiconductor passivation on quantum-dot-sensitized solar cells (QDSCs) has been systematically characterized for CdS and CdS/ZnS. We have found that passivation strongly depends on the passivation agent, obtaining an enhancement of the solar cell efficiency for compounds containing amine and thiol groups and, in contrast, a decrease in performance for passivating agents with acid...

Quantum dots (QDs) are semiconductor fluorescent nanoparticles, which can be used for food safety or environmental monitoring with high sensitivity. This work demonstrates the feasibility of detecting clenuterol residue in pig urine using CdSe/CdS quantum dots as fluorescent labels based magnetic core/shell Fe3O4/Au nanoparticles (MCFN) as solid carriers. The detection of clenbuterol is carried...

A great deal of interest has been dawn on the colloidal chemistry based semiconductor nanocrysallites, also known as quantum dots (QDs). Because of the strong quantum confinement, quantum dots have unique size-dependent optical properties, which are much more superior to the conventional organic fluorescence materials. In addition, strong chemical resistant makes inorganic semiconductor QDs ide...

Fast migration and efficient spatial separation of photogenerated charges in photocatalytic materials are indispensable to solar water splitting reactions. Here, we construct a three-phase heterostructure CdS/PbTiO3/TiO2 by selectively depositing CdS TiO2 at oppositely poled crystal facets PbTiO3 using single-domain ferroelectric PbTiO3. The has matching band edge alignments strong interfacial ...

Advances in the size1 and shape2 control of solution-grown nanocrystals have driven recent interest in the development of welldefined multicomponent nanostructures. Composition control, through the incorporation of two or more distinct nanostructured components, represents an effective approach to tailoring the chemical and physical properties of nanocrystals. The resulting hybrid structures of...