We report on the state-of-the art synthesis and improved luminescence properties of thiol-capped CdTe nanocrystals (NCs) synthesized in water. The optimized pH (12) molar ratio thiol to Cd ions (1.3:1) increases room-temperature photoluminescence quantum efficiency as-synthesized NCs capped by thioglycolic acid (TGA) values 40−60%. By employing mercaptopropionic (MPA) as a stabilizer, we have large (up 6.0 nm diameter) so that spectral range NCs' emission currently available within this...

We report a procedure to prepare highly monodisperse copper telluride nanocubes, nanoplates, and nanorods. The is based on the reaction of salt with trioctylphosphine in presence lithium bis(trimethylsilyl)amide oleylamine. CuTe nanocrystals display strong near-infrared optical absorption associated localized surface plasmon resonances. exploit this resonance for design surface-enhanced Raman scattering sensors unconventional probes. Furthermore, we also here our preliminary analysis use as...

Cu2ZnSnS4, based on abundant and environmental friendly elements with a direct band gap of 1.5 eV, is main candidate material for solar energy conversion through both photovoltaics photocatalysis. We detail here the synthesis quasi-spherical Cu2ZnSnS4 nanoparticles unprecedented narrow size distributions. further their use as seeds to produce CZTS-Au CZTS-Pt heterostructured nanoparticles. Such are shown have excellent photocatalytic properties toward degradation Rhodamine B hydrogen...

Abstract A simple method for the preparation of iron/iron oxide nanoparticles with core/shell cubic morphology is presented. The synthesis nanocubes was carried out through decomposition a preformed iron oleate complex at high temperature. Although this procedure has been shown previously to produce monodisperse magnetite spheres, [1] use squalene as solvent and presence sodium found induce cube formation. detailed high‐resolution transmission electron microscopy (HRTEM) analysis performed...

A successful synthesis of Cu2ZnxSnySe1+x+2y (CZTSe) nanoparticles is presented. Nearly monodisperse and highly faceted CZTSe were prepared through reaction metal amino complexes with saturated solutions selenium in trioctylphosphine at high temperature. High-resolution transmission electron microscopy X-ray diffraction analysis showed the nanocrystals to have tetragonal Cu2ZnSnSe4 crystallographic structure. Nanoscale-resolved energy loss spectroscopy images presence four elements each...

The aqueous synthesis and post-preparative treatment of thiol-stabilized ZnSe colloidal nanocrystals (2−3 nm in size) have been studied. irradiation the nanoparticles improves their luminescence properties leading to strong (up 25−30% photoluminescence quantum yield) band gap UV-blue emission. results an incorporation sulfur into particles formation ZnSe(S) alloyed nanocrystals. obtained were used for fabrication UV-blue-emitting layer-by-layer assembled films with a PL maximum at ca. 390 nm.

Electrochemical studies of thiol-capped CdTe nanocrystals in aqueous solution have demonstrated several distinct oxidation and reduction peaks the voltammograms, with peak positions being dependent on size nanocrystals. While dependence one potentials can be attributed to altering energetic band owing quantum effect, an extraordinary behavior was found for observed at less positive potentials. In contrast a prediction based this moves more negative as nanocrystals' decreases. Moreover,...

A synthetic route for producing Cu(2)ZnGeSe(4) nanocrystals with narrow size distributions and controlled composition is presented. These were used to produce densely packed nanomaterials by hot-pressing. From the characterization of thermoelectric properties these nanomaterials, demonstrated show excellent properties. very preliminary adjustment nanocrystal has already resulted in a figure merit up 0.55 at 450 °C.

The aqueous synthesis of thiol-stabilized semiconductor CdTe colloidal nanocrystals has been revisited. We found optimal conditions for the high-quality NCs through a study influence initial (structure and concentration Cd-thiol complexes) on quality nanocrystals. A numerical calculation shows clear correlation between CdL (where L is (SCH(2)COO)(2-)) in solution photoluminescence quantum efficiency

A procedure for the continuous production of Cu(2)ZnSnS(4) (CZTS) nanoparticles with controlled composition is presented. CZTS were prepared through reaction metals' amino complexes elemental sulfur in a continuous-flow reactor at moderate temperatures (300-330 °C). High-resolution transmission electron microscopy and X-ray diffraction analysis showed nanocrystals to have crystallographic structure compatible that kesterite. Chemical characterization materials presence four elements each...

A high-yield and upscalable colloidal synthesis route for the production of quaternary I2–II–IV–VI4 nanocrystals, particularly stannite Cu2+xCd1–xSnSe4, with narrow size distribution precisely controlled composition is presented. It also shown here how diversity valences in constituent elements allows an effective control their electrical conductivity through adjustment cation ratios. At same time, while crystallographic complexity chalcogenides associated intrinsically low thermal...

Morphology is a key parameter in the design of novel nanocrystals and nanomaterials with controlled functional properties. Here, we demonstrate potential foreign metal ions to tune morphology colloidal semiconductor nanoparticles. We illustrate underlying mechanism by preparing copper selenide nanocubes presence Al ions. further characterize plasmonic properties obtained their as platform produce cubic nanoparticles different composition cation exchange.

A multistrategy approach to overcome the main challenges of nanoparticle-based solution-processed Cu2ZnSnSe4 thin film solar cells is presented. We developed an efficient ligand exchange strategy, using antimony salt, displace organic ligands from surface Cu2ZnSnS4 nanoparticles. An automated pulsed spray-deposition system was used deposit nanoparticles into homogeneous and crack-free films with controlled thickness. After annealing in a Se-rich atmosphere, carbon-free crystalline absorber...

Abstract Transition metal dichalcogenides (TMDs) have emerged as a focal point in electrocatalysis, particularly for the hydrogen evolution reaction (HER), owing to their notable catalytic activity, chemical stability, and cost‐efficiency. Despite these advantages, challenge of devising practical economical method large‐scale application HER remains an unresolved critical issue. In this study, facile, scalable, cost‐effective approach is introduced producing high‐yield, catalytically active...

An oriented attachment and growth mechanism allows an accurate control of the size morphology Cu(2-x)S nanocrystals, from spheres disks to tetradecahedrons dodecahedrons. The synthesis conditions are detailed here.

We present here a detailed overview on the effect of various synthesis parameters during iron oxide nanoparticles with different shapes, through decomposition preformed oleate complex, at high temperature. While this procedure has been previously shown to produce monodisperse magnetite spheres, use specific additives is demonstrated allow for preparation strongly faceted nanocrystals, either cubic or octahedral shapes. Additionally, using squalene octadecene as solvents was found induce...

The potential to control the composition and crystal phase at nanometer scale enable production of nanocrystalline materials with enhanced functionalities new applications. In present work, we detail a novel colloidal synthesis route prepare nanoparticles ternary semiconductor Cu2GeSe3 (CGSe) nanometer-scale over their phases. We also demonstrate structural effect on thermoelectric properties bottom-up-prepared CGSe nanomaterials. By careful adjustment nucleation growth temperatures, pure...

We report on the photocatalytic hydrogen evolution under full-arc light irradiation of CuIn1−xGaxS2 wurtzite nanocrystals in presence SO32− and S2− as sacrificial reagents. analyzed generation rate a function Ga content associated it with energy band positions. For water splitting, CuInS2 bandgap is slightly too low to efficiently overcome reaction over-potential. The shifts up conduction edge providing larger driving force for photogenerated carriers activate splitting reduction reaction....

Transition metal phosphides have great potential to optimize a number of functionalities in several energy conversion and storage applications, particularly when nanostructured or nanoparticle form. However, the synthesis transition phosphide nanoparticles its scalability is often limited by toxicity, air sensitivity, high cost reagents used. We present here simple, scalable, cost-effective "heating up" procedure produce using inexpensive, low-toxicity, air-stable triphenyl phosphite as...

Ni_2−xCo<italic>x</italic>P nanocrystals with controlled composition were produced and demonstrated to show excellent activity toward the hydrogen evolution reaction.

Unidirectional energy transfer is achieved in bilayers of CdTe nanocrystals two different sizes produced by electrostatic assembly oppositely charged particles without the need for an intermediate linker. Within these planar structures with reduced inter-layer distance, rates up to (50 ps)−1 are demonstrated which 2.4 times faster than fastest reported date.

Faceted iron oxide nanoparticles with octahedral shape were synthesized through controlled modification of the oleate decomposition method. The key to this novel control is "in situ" formation trioctylammonium bromide (TOAHB) during process, quaternary ammonium salts. This hypothesis was confirmed by carrying out synthesis in presence preformed TOAHB, which again resulted octahedra. A detailed high-resolution transmission electron microscopy (HRTEM) analysis nanooctahedra performed for and...

The ample chemical and structural freedom of quaternary compounds permits engineering materials that fulfill the requirements a wide variety applications. In this work, mechanisms to achieve unprecedented size, shape, composition control in nanocrystals are detailed. described procedure allows obtaining tetrahedral penta-tetrahedral with tuned size distributions controlled compositions from plethora I2–II–IV–VI4 semiconductors.

A cation exchange-based route was used to produce Cu2ZnSnS4 (CZTS)–Ag2S nanoparticles with controlled composition. We report a detailed study of the formation such CZTS–Ag2S nanoheterostructures and their photocatalytic properties. When compared pure CZTS, use nanoscale p–n heterostructures as light absorbers for water splitting provides superior photocurrents. associate this experimental fact higher separation efficiency photogenerated electron–hole pairs. believe other type-II will open...