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Thickness-dependent photoelectric properties of MoS2/Si heterostructure solar cells
摘要： In order to obtain the optimal photoelectric properties of vertical stacked MoS2/Si heterostructure solar cells, we propose a theoretical model to address the relationship among film thickness, atomic bond identities and related physical quantities in terms of bond relaxation mechanism and detailed balance principle. We find that the vertical stacked MoS2/Si can form type ii band alignment, and its photoelectric conversion efficiency (PCE) enhances with increasing MoS2 thickness. Moreover, the optimal pce in MoS2/Si can reach 24.76%, inferring that a possible design way can be achieved based on the layered transition metal dichalcogenides and silicon.
关键词： detailed balance principle,photoelectric properties,bond relaxation mechanism,solar cells,MoS2/Si heterostructure
更新于2025-09-11 14:15:04
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A system composed of vanadium(IV) disulfide quantum dots and molybdenum(IV) disulfide nanosheets for use in an aptamer-based fluorometric tetracycline assay
摘要： A system composed of vanadium(IV) disulfide quantum dots (VS2 QDs) and molybdenum(IV) disulfide (MoS2) nanosheets for use in an aptamer-based fluorometric tetracycline assay was developed. The tetracycline (TET) aptamer was first immobilzed on the VS2 QDs with a typical size of 3 nm. The blue fluorescence of the VS2 QDs (labeled with aptamer) with emission maxima at 448 nm (under excitation at 360 nm) was subsequently quenched by MoS2 nanosheets. If TET is recognized by the aptamer, the VS2 QDs drift away from the basal plane of the MoS2 nanosheets. This generated “turn-on” fluorescence of the VS2 QDs. AVS2 QD/MoS2 nanosheet-based fluorometric TET aptasensor was thus constructed. Selective and sensitive TET bioanalysis was realized in a linear range of 1 to 250 ng mL?1. The detection limit was 0.06 ng mL?1. Its applicability of determination of TET in milk samples has been demonstrated.
关键词： MoS2,Aptamer,VS2 quantum dots,Fluorometric assay,Antibiotic,Turn-on fluorescence
更新于2025-09-11 14:15:04
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MoS2 decorated with graphene and polyaniline nanocomposite as an electron transport layer for OLED applications
摘要： The incorporation of two-dimensional MoS2 and GO (graphene oxide) into polyaniline (PANI) matrix emerges as a productive way for the enhancement in electrical and optical assets of pure PANI. The ternary nanocomposite PANI–rGO–MoS2 (PGM) is synthesized via in situ chemical oxidative polymerization of aniline monomer using ammonium persulfate (APS) as an oxidant with varying MoS2 contents. The surface morphological images of PGM nanocomposites declared the coating of PANI nanofibers, and GO sheets over stacked MoS2 sheets are investigated by field emission scanning electron microscope and transmission electron microscope. The interaction between polyaniline, reduced graphene oxide, and molybdenum disulfide was established by Fourier transform infrared spectroscopy and Raman spectroscopy. The bandgap was calculated for optimized PGM3 nanocomposite, nearly 1.21 eV with a relatively slow decay component and a higher non-radiative rate of electron–hole recombination. The photoluminescence spectra of PGM3 nanocomposite showed four bands: violet, blue, green–blue, and green. The chromaticity was observed in the deep blue region with a color purity of 70%. The conductivity of the optimized PGM3 nanocomposite was enhanced by 184.43% as compared to pristine PANI. These results justified that the optimized PGM3 nanocomposite is a suitable candidate as an effective electron transport layer for high performance in organic light-emitting diode (OLED) devices.
关键词： graphene oxide,MoS2,nanocomposite,electron transport layer,OLED,polyaniline
更新于2025-09-11 14:15:04
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Enhanced bulk photovoltaic effect in ZnO:Bix (p-type)/MoS2 (n-type) heterostructure by tuning Bi content
摘要： To investigate the metal oxide thin film application in optoelectronic field via changing its conduction type, the p-n junction with Bi-doped p-type ZnO and n-type MoS2 is fabricated by pulsed laser deposition. In this work, we explore the photovoltaic effect of the ZnO/MoS2 heterostructure, focusing on the function of tuning Bi contents in enhancing the photoelectric conversion efficiency. Doping-Bi ZnO thin film perfectly shows stable p-type semiconductor properties with high carrier concentration (about from 1×1016 to 1×1017 cm-3), high rational mobility (363 cm2/(υs)) and low resistivity (216.7 Ω). In addition, MoS2 clearly exhibits large quantities of nanosheets and distinct vertically standing structure. The power conversion efficiency (PCE) of ZnO:Bix/MoS2 enhances from 0.518 % to 2.430 % along with increasing doping Bi element from 1 % to 7 %, but when doping Bi content reaches 10 %, the PCE decrease 0.552 %. Essentially, the ability of capturing photon-generated carriers in ZnO:Bix film gradually increases as doping Bi content to without excessive doping content. These findings illustrate that this proposed Bi-doped ZnO has potential in promoting the photoelectric conversion efficiency of MoS2 based p-n junction.
关键词： photovoltaic effect,Doping - Bi,p-type ZnO,ZnO/MoS2
更新于2025-09-11 14:15:04
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In-situ fabrication of needle-shaped MIL-53(Fe) with 1T-MoS2 and study on its enhanced photocatalytic mechanism of ibuprofen
摘要： High photocatalytic hole-electron pairs separation efficiency and the wide use of inexpensive and earth-abundant materials as cocatalysts in most semiconductor-based photocatalytic systems are desired for improving the photocatalytic activity and practical application. Herein, we report a facile one-pot solvothermal approach of integrating stable metallic nonmetal materials 1T-MoS2 nanosheets with MIL-53(Fe) to form needle-shaped 1T-MoS2@MIL-53(Fe) (TSMF) composites. Interestingly, the introduction of 1T-MoS2 turns nonspecial-structured MIL-53 (Fe) into needle-like structure and the BET analysis reveals that the optimal TSMF composites possess abundant coexistence of micropores and mesopores with a large surface area of 337 m2g-1, which is about 16 folds higher than that of the pure MOFs. Meanwhile, it is remarkable that the photocatalytic rate of ibuprofen (IBP) by optimal TSMF nanocomposites has improved 7.5 and 9.4 times compared to the pristine MIL-53(Fe) and 1T-MoS2, respectively. The photocatalytic efficiency of TSMF composites enhances due to the emerging micropores, which can provide more adsorption and reaction sites. In addition, the formed compact and uniform interface contact between 1T-MoS2 sheets and MOF may dramatically accelerate the separation of the photo-induced charges, thus enhance the photocatalytic activity. We also study the photocatalytic mechanism combined the corresponding electrochemical testing and the photo-degradation intermediates identified by ion chromatography (IC) and LC-MS-MS, indicating that superoxide radicals (·O2-), hydroxyl radical (·OH) and electrons (e-) are the main active radicals in IBP photocatalysis and decarboxylation and hydroxylation are the main degradation pathways of IBP.
关键词： heterojunction structure,Visible light,MIL-53(Fe),ibuprofen,1T-MoS2
更新于2025-09-11 14:15:04
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MoS2/Bi2S3 heterojunctions-decorated carbon-fiber cloth as flexible and filter-membrane-shaped photocatalyst for the efficient degradation of flowing wastewater
摘要： Traditional powder/film-shaped photocatalysts suffer some serious limitations (such as recycling difficulty or high-cost) in the degradation of flowing wastewater. Herein, we report a novel filter-membrane-shaped photocatalyst by constructing MoS2/Bi2S3 heterojunctions on carbon-fiber cloth (CF/MoS2/Bi2S3 cloth). CF/MoS2/Bi2S3 cloth consists of carbon-fibers (diameter: ~ 15 μm) which are decorated with numerous MoS2 nanosheets (thickness: ~ 2 nm) and Bi2S3 nanorods (length: 500 ~ 600 nm), and it exhibits a broad-spectrum photoabsorption from ultraviolet to near-infrared region (> 1200 nm). Under visible-light irradiation, CF/MoS2/Bi2S3 cloth (area: 4 × 4 cm2) exhibits the highest photocurrent (~ 1.44 mA cm-2) and can photocatalytically remove 95.1% rhodamine B (RhB), 91.8% methylene blue (MB), 74.5% tetracycline (TC) and 75.5% hexavalent chromium (Cr(VI)) after 100 min, better than those by CF/MoS2 cloth (37.0% RhB, 39.9% MB, 29.6% TC, 21.6% Cr(VI)) and CF/Bi2S3 cloth (26.9% RhB, 27.4% MB, 20.9% TC, 25.9% Cr(VI)). Importantly, when flexible CF/MoS2/Bi2S3 cloth (diameter: 10 cm) is used as the filter-membrane to degrade the flowing wastewater (rate: ~ 1 L h-1), the removal efficiency of RhB increases from 19.7% at 1st to 94.6% at 8th filtering/degrading grade. Thus, CF/MoS2/Bi2S3 cloth has excellent potential as a novel filter-membrane-shaped photocatalyst to degrade the flowing wastewater.
关键词： MoS2/Bi2S3,carbon-fiber cloth,flowing wastewater,filter-membrane,photocatalysis
更新于2025-09-11 14:15:04
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Dewetting of monolayer water and isopropanol between MoS2 nanosheets
摘要： Understanding dewetting of solvent molecules confined to layered material (LM) interfaces is crucial to the synthesis of two-dimensional materials by liquid-phase exfoliation. Here, we examine dewetting behavior of water and isopropanol/water (IPA/H2O) mixtures between molybdenum disulfide (MoS2) membranes using molecular dynamics (MD) simulations. We find that a monolayer of water spontaneously ruptures into nanodroplets surrounded by dry regions. The average speed of receding dry patches is close to the speed of sound in air. In contrast, monolayer mixtures of IPA/H2O between MoS2 membranes slowly transform into percolating networks of nanoislands and nanochannels in which water molecules diffuse inside and IPA molecules stay at the periphery of islands and channels. These contrasting behaviors may explain why IPA/H2O mixtures are much more effective than H2O alone in weakening interlayer coupling and exfoliating MoS2 into atomically thin sheets.
关键词： molecular dynamics simulations,liquid-phase exfoliation,isopropanol/water mixtures,two-dimensional materials,layered material interfaces,dewetting,solvent molecules,MoS2 membranes
更新于2025-09-10 09:29:36
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Strategies to facilitate the formation of free standing MoS <sub/>2</sub> nanolayers on SiO <sub/>2</sub> surface by atomic layer deposition: A DFT study
摘要： In this study, we employ density functional theory calculations to investigate the very initial formation of a buffer layer during atomic layer deposition of MoS2 at the SiO2 (001) surface. In our previous study, we described that the self-limiting atomic layer deposition (ALD) reactions using Mo(NMe2)2(NtBu)2 as precursor and H2S as co-reagent terminate in the formation of a so-called building block on the SiO2 (001) surface. This building block consists of Mo which shares bonds with the surface O of SiO2 (001) at the bottom and terminal S at the top. Electronic band structure calculations indicate that the subsequently deposited buffer-layer that is composed of these building blocks has (opto)-electrical properties that are far from the ideal situation. Based on our studies, we propose alternative ALD chemistries which lead to the formation of a so-called underpinned building block. In this cluster, the Mo atoms are underpinned by S atoms, suppressing the formation of a buffer layer. This ultimately facilitates the formation of a free standing conformal 2D-MoS2 nanolayer at the interface. Through the proposed chemistries, the opto-electrical properties of the deposited layers will be preserved.
关键词： opto-electrical properties,MoS2,SiO2,density functional theory,atomic layer deposition
更新于2025-09-10 09:29:36
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In situ photoelectrochemical activation of sulfite by MoS2 photoanode for enhanced removal of ammonium nitrogen from wastewater
摘要： The advanced oxidation processes (AOPs) based on oxysulfur radicals (SO3??, SO4?? and SO5??) has been receiving growing attention in wastewater treatment. In this study, we report the in situ photoelectrochemical activation of sulfite to produce oxysulfur radicals with MoS2 nanosheets as a wide spectrum absorptive photoanode. At alkaline condition, the selective and efficient conversion of ammonia to dinitrogen was exclusively achieved in the presence of sulfite electrolyte under visible light irradiation. The sulfite plays multiple roles such as working as hole scavenger for improving stability of MoS2 electrode by inhibiting photo-corrosion and serving as precursor of oxysulfur radicals in the meantime. The influences of radical scavenger, dissolved oxygen and electrolyte on the photoelectrochemical, electrochemical and photochemical conversion of ammonia verified that oxysulfur radicals are more powerful than hydroxyl radicals in terms of ammonia conversion. The proposed system appears to be applicable to in situ treatment of wastewater containing of ammonia and sulfite pollutants, such as wastewater from ammonia-absorption-desulfurization of combustion smoke. This work also provides a new protocol in the design of new AOPs, where oxysulfur radicals can work together with hydroxyl radicals for simultaneous pollutants degradation and detoxification.
关键词： photoelectrocatalysis,sulfite activation,MoS2,advanced oxidation process,ammonia oxidation
更新于2025-09-10 09:29:36
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Equilibrium and kinetic modelling of adsorption of Rhodamine B on MoS2
摘要： The recent emergence of layered MoS2, which is an earth-abundant material, has gained increasing attention in various fields. In this work, MoS2 is fabricated via a simple hydrothermal method with different sulfur precursors. The effect of S source on the morphologies and adsorption capacities of Rhodamine B (RhB) onto MoS2 were investigated. The results indicated that the MoS2 prepared by CH4N2S exhibited the highest adsorption capacity. The N2 sorption isotherm indicated that the as-prepared MoS2-CH4N2S is a mesoporous microsphere. In addition, the adsorption process can be well described by the Langmuir isotherm model and the pseudo second-order model. The intra-particle diffusion model was also employed to analyze the adsorption mechanisms, which demonstrated that the intra-particle diffusion within the mesopores played an important role in the overall adsorption process. Based on these results, MoS2-CH4N2S obtained in this work can be served as a promising candidate for dye removal in wastewater.
关键词： adsorption kinetics,dye adsorption,adsorption mechanisms,Rhodamine B (RhB),MoS2
更新于2025-09-10 09:29:36