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Microwave-Assisted Synthesis of Quasi-Pyramidal CuInS <sub/>2</sub> -ZnS Nanocrystals for Enhanced Near-Infrared Targeted Fluorescent Imaging of Subcutaneous Melanoma
摘要： Near-infrared (NIR) fluorescent CuInS2–ZnS nanocrystals (CIZS NCs) are synthesized via an ultra-fast, non-injection microwave (MW)-assisted nanoalloying process at 230 oC within 5 min using 1-dodecanethiol (DDT) as both the sulfur source and solvent under solvothermal (ST) condition. The structural and surface analyses reveal that DDT-functionalized CIZS NCs exhibit quasi-pyramids of tetragonal-phase with well-defined facets. The DDT-functionalized CIZS NCs present a photoluminescence quantum yield (PLQY) of 76% and a long-lived fluorescence lifetime of ≈0.6 μs in organic-phase. Subsequently, DDT-functionalized CIZS NCs are phase-transferred via ligand-exchange using 11-mercaptoundecanoic acid (MUA) into water-soluble MUA–CIZS NCs that exhibit a substantial PLQY of 55%. In addition, the NIR-fluorescent MUA-functionalized CIZS NCs in conjugation with folic acid (FA), as a tumor-targeting ligand, demonstrates enhanced tumor-targeted imaging ability. The FA–MUA–CIZS NC conjugates exhibit a cell viability of ≈75% even at the highest concentration of 1 mg mL–1 and a labeling efficiency of 95.4%. The in vivo imaging results corroborate that FA–MUA–CIZS NCs conjugates are actively targeted to folate receptor-positive B16F10 tumor-bearing C57BL/6 mice in 2 h. The histopathological and hematological studies confirm no significant changes in tissue architecture and blood biochemical parameters. The confocal microscopy studies reveal deep penetration and uniform distribution of FA–MUA–CIZS NCs conjugates in subcutaneous melanoma.
关键词： CuInS2–ZnS nanocrystals,nano-bioprobe,nanoalloying approach,targeted bioimaging,microwave-solvothermal method
更新于2025-11-21 11:08:12
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A “turn off-on” fluorescent nanoprobe consisting of CuInS2 quantum dots for determination of the activity of β-glucosidase and for inhibitor screening
摘要： A fluorescent “turn off-on” nanoprobe is described for highly sensitive and selective determination of the activity of the enzyme β-glucosidase (β-Glu). Firstly, cysteine modified CuInS2 quantum dots (Cys-CuInS2 QDs) were prepared from indium(III) and copper(II) salts and the presence of thiourea. The red fluorescence of the Cys-CuInS2 QDs, with excitation/emission maxima at 590/656 nm, is quenched by Cu(II). However, in the presence of β-Glu and the cyanogenic glycoside, enzymatic hydrolysis leads to the formation of cyanide. The latter competitively binds to Cu(II) owing to its high affinity for cyanide. This restores the fluorescence of the Cys-CuInS2 QDs. Under the optimum conditions, fluorescence increases linearly in the 0.5–700 U·L?1 β-Glu activity range. The detection limit is 0.2 U·L?1. The nanoprobe was applied to analyze spiked soil samples, and satisfactory results were obtained. The average recoveries of β-Glu were in the range of 96–103%, and the RSD was lower than 4.0%. The fluorescent probe can also be used to screen for β-Glu inhibitors as demonstrated for castanospermine as an example.
关键词： Cys-CuInS2 QDs,Cu(II),Cyanide,Competitively binds,Cyanogenic glycoside,Soil,Enzyme activity,Fluorescence,Amygdalin,Castanospermine
更新于2025-11-19 16:46:39
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CuInS2 sensitized TiO2 for enhanced photodegradation and hydrogen production
摘要： A novel CuInS2/TiO2 (CIS-TO) heterojunction which displayed two different transfer pathways of photo-generated carries under UV–vis and Vis light irradiation was fabricated through a facile in-situ growth method. Under vis-light (λ ≥ 420 nm) excitation, 97.37% RhB (10 mg/L) was photodegraded with 20 mg of 1% CIS-TO photocatalyst within 90 min, and the degradation constant could up to 0.0415 min?1, which was about 8.28 times to pure TiO2 (0.00501 min?1) and the typical heterojunction was formed between CuInS2 and TiO2 to provide the photo-electrons transfer channel. Under UV–vis light irradiation, a Z-scheme heterojunction was formed to provide another highly effective electron transfer channel for hydrogen production and the hydrogen production rate could reach 785.4 μmol g?1 h?1 with 1% CIS-TO photocatalyst, which showed nearly 1.68 times than that of pure TiO2. The enhanced photocatalytic activity could be attributed to the synergistic effect of the sensitization and narrow band gap of CuInS2 which could effectively broaden the spectral response range, enhance the photon utilization and inhibit the recombination of photogenerated electrons and holes. Additionally, the high stability of the material was illustrated by the cycle experiments of photodegradation and hydrogen production.
关键词： Typical heterojunction,Sensitization,Z-scheme heterojunction,Photodegradation,CuInS2/TiO2
更新于2025-09-23 15:23:52
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Construction of CuInS2@ZIF-8 nanocomposites with enhanced photocatalytic activity and durability
摘要： Inspired by the unique structure and wide applications of zeolitic imidazolate frameworks-8 (ZIF-8) and CuInS2 (CIS), considerable attention has focused on the combination of both materials. We herein report a facial method for the homogeneous decoration of ZIF-8 onto the surfaces of CuInS2 (CIS) nanoparticles coordinated by poly-vinyl pyrrolidone (PVP) in methanol. It has been shown that the coordination of PVP plays a key role in inducing the nucleation of ZIF-8 on the surface of CIS nanoparticles because of the pyrrolidone rings (C = O) in PVP offering an improved affinity between CIS and Zn ions. Performing as a catalyst, the CIS@ZIF-8 nanocomposites not only exhibit high photocatalytic activity for the degradation of organic dye under UV light irradiation, but also largely maintain their catalytic efficiency after being recycled for five times compared with that of pure CIS nanoparticles.
关键词： Photocatalytic properties,Semiconductors,CuInS2@ZIF-8,Nanocomposites
更新于2025-09-23 15:23:52
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Bandgap-Tuned CuInS <sub/>2</sub> /ZnS Core/Shell Quantum Dots for a Luminescent Downshifting Layer in a Crystalline Silicon Solar Module
摘要： CuInS2 (CIS) quantum dots (QDs) were investigated as a luminescent downshifting (LDS) material that converts near-ultraviolet (UV) light to visible light and were applied to a single crystalline silicon (c-Si) solar module that has no spectral sensitivity in the near-UV region. The bandgap of the CIS/ZnS core/shell QDs was successfully adjusted to ~3 eV, which was adequate for the LDS layer in solar devices, by changing the molar ratio of Cu/In. CIS/ZnS/ZnS core/shell/shell QDs with 59.9% absolute photoluminescence (PL) quantum yield were prepared by the hot-injection method and embedded in ethylene vinyl acetate copolymer (EVA) resin to fabricate QD@EVA films as the LDS layer. The PL intensity of the QD@EVA films under near-UV excitation monotonically increased with increasing QD concentration. The films were attached to a commercial single c-Si solar module. The advantages and drawbacks of the films were discussed based on the results of incident photon-to-electron conversion efficiency and current-voltage curve measurements.
关键词： CuInS2/ZnS,quantum dot,nanocomposite film,solar module,nanophosphor,luminescent downshifting layer,photoluminescence
更新于2025-09-23 15:21:01
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Metal-Doped Copper Indium Disulfide Heterostructure: Environment-Friendly Hole-Transporting Material toward Photovoltaic Application in Organic-Inorganic Perovskite Solar Cell
摘要： In this plan, we use Praseodymium metal-doped copper indium disulfide (Pr-doped CIS) heterostructure as hole-transporting materials (HTMs) in the FTO/TiO2/Perovskite absorber/HTM/Au device. And photovoltaic performance of these Pr-doped CIS heterostructure was investigated in the fabrication of the organic-inorganic perovskite solar cells (organic-inorganic PSCs).
关键词： Pr-coated CuInS2 heterostructure,solar energy,perovskite solar cells,green electricity,hole-transporting material
更新于2025-09-23 15:21:01
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Influence of Halide Ions on the Structure and Properties of Copper Indium Sulphide Quantum Dots
摘要： In the synthesis of CuInS2 quantum dots (QDs), the halide ions present in the copper salts influence the QD growth and optical properties. X-ray absorption spectroscopy allowed rationalizing the halide incorporation in the lattice and the dependency of electronic properties of the material on the ion’s polarizability and interaction with hydrophobic moieties.
关键词： optical properties,halide ions,CuInS2 quantum dots,X-ray absorption spectroscopy
更新于2025-09-23 15:19:57
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Wavefunction engineering for efficient photoinduced-electron-transfer in CuInS2 quantum dots sensitized solar cells
摘要： The high-efficiency of quantum dots (QDs) sensitized solar cells benefits from the highly efficient photoinduced-electron-transfer (PET) to external electrodes. Here, we investigated how the efficiency of the PET. Though the electron trapping can be suppressed after the ZnS surface surface defects and conduction-band (CB) offsets between core and shell materials affect the PET from CuInS2 QDs by means of time-resolved femtosecond transient-absorption and nanosecond photoluminescence spectroscopy. The transfer of 1S excited electrons from CuInS2 QDs to TiO2 films is demonstrated and we find that the surface electron-trapping can significantly reduce the efficiency of CuInS2 QDs sensitized solar cells. CB offset, which allows us to achieve a quasi-type II carrier confinement in CuInS2/CdS core/shell QDs because of their low electron-density at QD surface. The surface delocalization of electron wavefunction from CuInS2 core to CdS shell. Finally, we demonstrate that these new mechanistic understandings of the PET processes are of great crucial for improving the efficiency of CuInS2 QDs sensitized solar cells.
关键词： quantum dots sensitized solar cells,photoinduced electron-transfer,quantum dots,CuInS2,wavefunction engineering
更新于2025-09-23 15:19:57
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Neural network modeling and simulation of the synthesis of CuInS <sub/>2</sub> /ZnS quantum dots
摘要： The development of recipes for synthesis of quantum dots (QDs), a novel semi-conductor material for application in optoelectronic devices, is currently purely based on experiments. Since the quality of QDs represented by quantum yield (QY) and emission peak strongly depends on a number of different parameters (route, precursors, conditions, etc), a large number of experiments is necessary. In this article, we show that data-driven modeling can be used as a supporting tool for optimization and a better understanding of the synthesis process. By using the results collected during the development of CuInS2/ZnS (CIS/ZnS) QDs, a neural network model has been established. The model is able to predict the optical properties (QY and emission peak) of CIS/ZnS QDs as a function of the most important synthesis parameters, such as reaction temperature, time of CIS core formation and ZnS shell growth, feed molar ratio of Cu/In and Zn/Cu, various starting precursors, and types of ligands. Finally, a model analysis under various effects influencing the quality of QDs is performed.
关键词： CuInS2/ZnS,optimization,simulation,neural network,quantum dots
更新于2025-09-23 15:19:57
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CuInS <sub/>2</sub> -Doped ZnS Quantum Dots Obtained via Non-Injection Cation Exchange Show Reduced but Heterogeneous Blinking and Provide Insights into Their Structurea??Optical Property Relationships
摘要： Cadmium-free CuInS2-doped ZnS quantum dots (QDs) are synthesized through a 2-step non-injection synthetic method. The resulting QDs are small (8 nm or less) and relatively isotropic with photoluminescence quantum yields (PL QY) up to almost 70% and emission peaks in the 560-600 nm window, depending on the amount of Zn precursor added. The results indicate small CuInS2 ‘clusters’ within a zinc-blende ZnS lattice are the radiative recombination centers in the nanoparticle. Interestingly, higher ensemble photoluminescence quantum yields (PL QY) result when cation exchange is less extensive (~80 % ZnS composition), while a reduction in blinking is observed when ZnS composition exceeds 99%. A wide heterogeneity in blinking behavior from QD-to-QD is evident and a subpopulation statistical analysis shows that the on-state dwell times change from multiexponential (or inverse power law) behavior towards more mono-exponential behavior for particles that spend more of their time in the on-state. These results indicate that, as the number of CuInS2 emitting centers is reduced, the number of pathways leading to the off-state decreases, and a model is proposed to relate this behavior to the QD structure. These results provide a novel route towards CuInS2-doped visible-light emitting ZnS QDs with high quantum yield and reduced blinking and provides insight into how the composition of dopant and host matrix affects the radiative recombination mechanisms in single particles.
关键词： non-injection cation exchange,CuInS2-doped ZnS,blinking,structure-optical property relationships,quantum dots
更新于2025-09-23 15:19:57