Abstract Machine learning holds significant research potential in the field of nanotechnology, enabling nanomaterial structure and property predictions, facilitating materials design discovery, reducing need for time‐consuming labor‐intensive experiments simulations. In contrast to their achiral counterparts, application machine chiral nanomaterials is still its infancy, with a limited number publications date. This despite great advance development new sustainable high values optical...

Chiroptically active fluorescent semiconductor nanocrystals, quantum dots (QDs), are of high interest from a theoretical and technological point view, because they promising candidates for range potential applications. Optical activity can be induced in QDs by capping them with chiral molecules, resulting circular dichroism (CD) signals the QD ultraviolet–visible (UV-vis) absorption. However, effects ligand concentration binding modes on chiroptical properties still poorly understood. In...

Abstract Chirality is one of the most fascinating occurrences in natural world and plays a crucial role chemistry, biochemistry, pharmacology, medicine. has also been envisaged to play an important nanotechnology particularly nanophotonics, therefore, chiral chiroptical active nanoparticles (NPs) have attracted lot interest over recent years. Optical activity can be induced NPs several different ways, including via direct interaction achiral with molecule. This results circular dichroism...

The efficient and sensitive detection of pathogenic microorganisms in aqueous environments, such as water used medical applications, drinking water, cooling industrial plants, requires simple fast methods suitable for multiplexed flow cytometry (FCM) with optically encoded carrier beads. For this purpose, we combine fluorescent Cd-free Ag–In–S ternary quantum dots (t-QDs) fluorescence lifetimes (LTs) several hundred nanoseconds superparamagnetic Fe3O4 nanoparticles (SPIONs) mesoporous CaCO3...

Ternary quantum dots (QDs) are very promising nanomaterials with a range of potential applications in photovoltaics, light-emitting devices, and biomedicine. Despite quite intensive studies ternary QDs over the last years, specific relaxation channels involved their emission mechanisms still poorly understood, particularly corresponding core-shell nanostructures. In present work, we have studied recombination pathways AgInS2 stabilized ZnAgInS alloy layer ZnS shell (AIS/ZAIS/ZnS QDs) using...

We studied the optical properties of poly(ethylene terephthalate) ion track membranes 1.5, 0.5 and 0.05 µm pores impregnated with luminescent semiconductor CdSe/ZnS nanocrystals different diameters (2.5 5 nm). The were embedded from their colloidal solutions in toluene by immersion a membrane solution. Localization quasi-isolated weakly interacting loosened layer on pore wall surface along existence empty was demonstrated. observed also spatial separation 2.5 nm size 50 pores.

We prepared hybrid structures based on CdSe/ZnS quantum dots and organic azo-dyes porphyrin molecules embedded into polymer track pore membranes. The quenching of the dot's photoluminescence shortening its decay time, accompanied in latter case by a sensitized photoluminescence, present clear evidence efficient energy transfer these structures. proposed quantum-dot/azo-dyes quantum-dot/porphyrin can be used different microfluidic systems for, e.g., sensing metal ions or singlet oxygen generation.

Magnetic, optical, and structural properties of superparamagnetic CoFe2O4 nanoparticles (MNPs), both isolated in aggregates, are investigated by magnetic circular dichroism (MCD) spectroscopy. The MCD signal for MNPs is more than an order magnitude greater the organic molecules, therefore making this technique a very sensitive tool examination MNP properties. aggregation had distinct effect upon intensity. Correlation between intensity magnetization shows that colloidal solutions results...

Fluorescence resonance energy transfer in complexes of semiconductor CdSe/ZnS quantum dots with molecules heterocyclic azo dyes, 1-(2-pyridylazo)-2-naphthol and 4-(2-pyridylazo) resorcinol, formed at high dot concentration the polymer pore track membranes were studied by steady-state transient PL spectroscopy. The effect interaction between free on efficiency fluorescence luminescence quenching was found discussed.

Over recent years, quantum dots (QDs) based on ternary metal dichalcogenides have attracted a lot of attention due to their unique properties and range potential applications. Here, we review the latest studies optical AgInS2/ZnS QDs with emphasis theoretical modeling, present our investigations electronic transitions invisible in unstructured absorption spectra QDs. The analysis absorption, photoluminescence excitation (PLE), magnetic circular dichroism (MCD) hydrophobic hydrophilic...

The photoluminescence response of semiconductor CdSe/ZnS quantum dots embedded in a borosilicate porous glass matrix to exposure ammonia vapor is investigated. formation surface complexes on the results quenching and shortening luminescence decay time. process reversible, desorption molecules from dot causes recover. sensitivity intensity time interaction reversibility changes make system candidate for use as an optical sensor ammonia.

We report on the enhancement of electrical photoresponse in a hybrid structure composed multi-layer graphene flakes covered by layer CdSe/ZnS quantum dots (QDs) and placed between metal electrodes. The rate photoexcitation energy transfer from QDs to graphene, (0.5–2)×109 s−1 which controls photoelectrical response structure, was found analysis photoluminescence intensities decay times for solution, bare glass substrate surface multilayer presence ammonia vapors.

Nowadays, multiplex analysis is very popular, since it allows to detect a large number of biomarkers simultaneously. Traditional usually based on changes photoluminescence (PL) intensity and/or PL band spectral positions in the presence analytes. Using lifetime as an additional parameter might increase efficiency methods. Quantum dots (QDs) can be used luminescent markers for analysis. Ternary in-based QDs are great alternative traditional Cd-based one. possess all advantages QDs, including...

In present study complexes between non-toxic ZnSe/ZnS quantum dots and chlorin e6 molecules that are widely used as photosensitizers in photodynamic therapy were formed. It was found aqueous solution cationic formed stable exhibit efficient photoexcitation energy transfer from to molecules. Spectroscopic methods applied evaluate the efficiency. Stoichiometry of these studied. Additionally, efficacy dotchlorin vitro assessed against Ehrlich ascites carcinoma cancer cell line using a trypan...

Hybrid structures based on CdSe/ZnS quantum dots and porphyrin molecules with effective energy transfer were formed in samples of polymer track pore membrane. It was observed that efficiency depends dot size correlates overlapping integral between photoluminescence absorption spectra inherent for Förster Resonant Energy Transfer, FRET. However, a noticeable deviation experimental FRET dependence an acceptor concentration from theoretical ones all donor-acceptor pairs. A gradient donor...

This paper demonstrates photoinduced dissociation of complexes CdSe/ZnS quantum dots with molecules 1,2-pyridylazo naphthol under the action external radiation various spectral compositions and powers. It is found that energy transport from to azo dye molecule appreciably contributes rate complexes. An analysis made it possible for first time experimentally estimate efficiency intracomplex transfer conditions in which no luminescence acceptor observed.

Anisotropic quantum nanostructures have attracted a lot of attention due to their unique properties and range potential applications. Magnetic circular dichroism (MCD) spectra semiconductor CdSe/ZnS Quantum Rods CdSe/CdS Dot-in-Rods been studied. Positions four electronic transitions were determined by data fitting. MCD analyzed in the A B terms, which characterize splitting mixing states. Effective values terms for each transition. relatively high value term is noted, most likely associated...

We investigate electrical photoresponse of multilayer graphene decorated with CdSe/ZnS quantum dots. It was found that these hybrid structures depends on dot photoluminescence yield. demonstrate in uence external factors (light exposure and treatment ammonia vapors) yield dots the structures.

The influence of ultraviolet (UV) laser irradiation on the optical properties carbon dots (CDs) prepared by hydrothermal synthesis from citric acid and ethylenediamine has been investigated. Investigation was performed in close-packed films obtained drop-casting. Observed photoluminescence redshift ascribed to Förster Resonance Energy Transfer (FRET). UV increased dot film light transmission intensity leads a blueshift photoluminescence. We attribute these changes CD surface distraction via...

Abstract Quantum dots (QDs) have been envisaged as very promising materials for the development of advanced optical sensors. Here we report a new highly porous luminescent material based on colloidal QDs potential applications in sensing devices. Bulk flower-like structures with sizes hundreds microns produced by slow destabilization QD solution presence non-solvent vapor. The was formed from CdSe using approach destabilization. This demonstrated 4-fold decrease PL signal ammonia...

Fabrication of novel micron-scale structures based on multi-layer graphene and quantum dots (QD) hybrids is presented. Two types CdSe/ZnS (core/shell) QDs with diameters 5.3 2.5 nm photoluminescence peaks at 630 530 nm, respectively, were used. The photoresponse for illumination by a 473 wavelength laser was found to change polarity these two QDs, being positive larger negative smaller ones. presented photo-resistive devices can be used studies the mechanisms responsible photoinduced layer...