We synthesize colloidal nanocrystals (NCs) of Rb3InCl6, composed isolated metal halide octahedra ("0D"), and Cs2NaInCl6 Cs2KInCl6 double perovskites, where all share corners are interconnected ("3D"), with the aim to elucidate compare their optical features once doped Sb3+ ions. Our computational analyses evidence that photoluminescence quantum yield (PLQY) these systems is consistently lower than corresponding bulk materials due presence deep surface traps from under-coordinated Also,...

We report here the synthesis of undoped and Cu-doped Cs2ZnCl4 nanocrystals (NCs) in which we could tune concentration Cu from 0.7 to 7.5%. has a wide band gap (4.8 eV), its crystal structure is composed isolated ZnCl4 tetrahedra surrounded by Cs+ cations. According our electron paramagnetic resonance analysis, 2.1% NCs ions were present +1 oxidation state only, while at higher concentrations detect Cu(II) (isovalently substituting Zn(II) ions). The non emissive, samples had bright intragap...

We devised a hot-injection synthesis to prepare colloidal double-perovskite Cs2NaBiCl6 nanocrystals (NCs). also examined the effects of replacing Na+ with Ag+ cations by preparing and characterizing Cs2Na1–xAgxBiCl6 alloy NCs x ranging from 0 1. Whereas were not emissive, featured broad photoluminescence band at ∼690 nm, Stokes-shifted respective absorption ≥1.5 eV. The emission efficiency was maximized for low amounts, reaching ∼3% Cs2Na0.95Ag0.05BiCl6 composition. Density functional theory...

The most developed approaches for the synthesis of InAs nanocrystals (NCs) rely on pyrophoric, toxic, and not readily available tris-trimethylsilyl (or tris-trimethylgermil) arsine precursors. Less toxic commercially chemicals, such as tris(dimethylamino)arsine, have recently emerged alternative As Nevertheless, NCs made with compounds need to be further optimized in terms size distribution optical properties order meet standard reached arsine. To this aim, work we investigated role ZnCl2...

InAs-based nanocrystals can enable restriction of hazardous substances (RoHS) compliant optoelectronic devices, but their photoluminescence efficiency needs improvement. We report an optimized synthesis InAs@ZnSe core@shell allowing to tune the ZnSe shell thickness up seven mono-layers (ML) and boost emission, reaching a quantum yield ≈70% at ≈900 nm. It is demonstrated that high be attained when least ≈3ML. Notably, lifetimeshows only minor variation as function thickness, whereas Auger...

Abstract Heavy‐metal‐free III–V colloidal quantum dots (QDs) exhibit promising attributes for application in optoelectronics. Among them, InAs QDs are demonstrating excellent optical performance with respect to absorption and emission the near‐infrared spectral domain. Recently, attained a substantial improvement photoluminescence yield, achieving 70% at wavelength of 900 nm through strategic overgrowth thick ZnSe shell atop core. In present study, light‐emitting diodes (LEDs) based on this...

We demonstrate efficient, stable, and fully RoHS-compliant near-infrared (NIR) light-emitting diodes (LEDs) based on InAs/ZnSe quantum dots (QDs) synthesized by employing a commercially available amino-As precursor. They have record external efficiency of 5.5% at 947 nm an operational lifetime ∼32 h before reaching 50% their initial luminance. Our findings offer new solution for developing technologies Pb-free colloidal QDs.

In this work, we report the hot-injection synthesis of Cs3ZnCl5 colloidal nanocrystals (NCs) with tunable amounts Cu+ and Mn2+ substituent cations. All samples had a rodlike morphology, diameter ∼14 nm length ∼30-100 nm. Alloying did not alter crystal structure host NCs, Cu ions were mainly introduced in oxidation state +1 according to X-ray photoelectron electron paramagnetic resonance spectroscopies. The spectroscopic analysis unalloyed, Cu-alloyed, Mn-alloyed, Cu, Mn coalloyed NCs...

The localized surface plasmonic resonance absorption wavelength can be tuned effectively by varying the crystal structure, morphology and ligands, which manipulated Cu : S precursor ratios post-treatment temperature dodecanethiol.

We illustrate here the high photocatalytic activity of sustainable lead-free metal halide nanocrystals (NCs), namely, Cs3Sb2Br9 NCs, in reduction p-substituted benzyl bromides absence a cocatalyst. The electronic properties bromide substituents and substrate affinity to NC surface determine selectivity C-C homocoupling under visible light irradiation. This photocatalyst can be reused for at least three cycles preserves its good performance with turnover number ca. 105,000.

2D CuGaS₂nanoplates exhibit an improved photocatalytic hydrogen activity as compared to 1D nanorods and quasi-2D nanodisks.

We have approached the synthesis of colloidal InAs nanocrystals (NCs) using amino-As and ligands that are different from commonly employed oleylamine (OA). found carboxylic phosphonic acids led only to oxides, whereas tri-n-octylphosphine, dioctylamine, or trioctylamine (TOA), when as sole ligands, yielded NCs with irregular sizes a broad size distribution. Instead, various combinations TOA OA delivered good control over distribution, TOA:OA volume ratio 4:1 generated tetrapods arm length...

Ternary alloyed Cu2–xSySe1–y nanocrystals (NCs) were synthesized by using a simple and phosphine-free colloidal approach, in which sulfur powder 1-dodecanethiol (DDT) used as sources. In both cases, the crystal phase transformed from cubic berzelianite to monoclinic djurleite structure together with morphology evolution quasi-triangular spherical or discal an increase of content. Accordingly, near-infrared (NIR) localized surface plasmon resonance (LSPR) absorption as-obtained sulfur-rich...

L-shaped wurtzite Cu–Ga–Zn–S alloyed nanorods are synthesized using a non-injection method for the first time, and they exhibit an enhanced photocatalytic hydrogen evolution compared with their binary or ternary counterparts.

Multinary copper-based chalcogenide nanocrystals (NCs) as light-driven photocatalysts have attracted extensive research interest due to their great potential for generating sustainable energy without causing environmental concerns. However, systematic studies on the growth mechanism and related photocatalytic activities involving different valent metal ions (either M2+ or N3+) foreign cations monoclinic Cu1.94S NCs 'parent lattice' rarely been carried out. In this work, we report an...

Abstract A colloidal synthesis protocol is demonstrated for InAs@InP core@shell quantum dots (QDs) with a tunable InP shell thickness (ranging from 3 to 8 monolayers), utilizing tris(diethylamino)‐arsine and ‐phosphine. Structural analysis reveals that the preferentially grows onto tetrahedral InAs cores along <‐1‐1‐1> directions, forming tetrapodal‐shaped QDs. Growth of causes red shift in absorption spectrum This explained by considering electrons are delocalized throughout whole...

The effects of size, shape, surface ligands and oxygen exposure time on the localized plasmon resonance absorption in monoclinic djurleite nanocrystals have been demonstrated.

As the most common malignant tumor in world, prognosis of patients with advanced lung cancer remains poor even after treatment. There are many prognostic marker assays available, but there is still more room for development high-throughput and sensitive detection circulating DNA (ctDNA). Surface-enhanced Raman spectroscopy (SERS), a spectroscopic method that has received wide attention recent years, can achieve exponential amplification signals by using different metallic nanomaterials....

Abstract Absorbing near‐infrared (NIR) photons, with longer wavelengths, in atomically thin monolayer MoS 2 presents a significant challenge due to its weak optical absorption and narrow bands. Consequently, ‐based photodetector devices often experience low responsivity limited detection window. Herein, novel InAs@ZnSe core@shell/1L‐MoS heterostructure, leveraging as the primary infrared‐absorbing material exploiting formation of type‐II heterostructure is showcased. Steady‐state...

In this study, we present a pump-free SERS microfluidic chip capable of detecting liver cancer-related miR-21 and miR-155 concurrently with ultra-sensitivity high efficiency. We employed Fe 3 O 4 @cDNA-AuNPs@Raman reporter@H composite structure recognition competition strategy. When the target miRNAs (miR-21 miR-155) are in test liquid, they specifically compete nucleic acid complementary strand(H) reporter@H, causing AuNPs to competitively detach from surface , resulting decrease signal....