- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Ni doped noble-metal-free CdZnNiS photocatalyst for high-efficient photocatalytic hydrogen evolution reduction by visible light driving
摘要： In this paper, we report a method that the transition element nickel is doped into the interstitial position of CdZnS (CZS) nanoparticles for their photocatalytic hydrogen evolution activity boosting. It is demonstrated that CdZnNiS nanocrystalline materials (with 0.5 wt% of Ni) could achieve the highest photocatalytic H2-evolution activity of 25.4 mmol·g?1·h?1 in sulfide and sulfite solution under visible light which value is 1.16 times higher than that of Pt modified CdZnS particles (with 3 wt% of Pt). This work evidences the possibility of substitution of noble metal cocatalyst by adding a suitable inexpensive Ni to achieve high-efficient visible light driven water splitting hydrogen production.
关键词： Semiconductors,CdZnNiS nanocrystalline materials,Noble-metal-free cocatalyst,Gap doping,Nanocomposites,Water splitting
更新于2025-09-23 15:22:29
-
Functional phase bistability in a nanocrystalline RbMn[Fe(CN)6] thin film fabricated by matrix-assisted laser evaporation
摘要： One of the main barriers hindering applications of Prussian blue metal assemblies is their poor processability, which makes the fabrication of intact thin films very difficult. In this work, a nanocrystalline RbMn[Fe(CN)6]·xH2O film on silicon substrate was obtained for the first time via laser-stimulated deposition and investigated. Temperature-induced phase transition and bistability within broad hysteresis loop (120 K), along with transition temperatures up to 317 K, which is the highest in the RbMnFe series, were observed using variable-temperature Raman spectroscopy. This study thus proposes a reliable deposition approach for preparing a functional magnetic materials that operate at room temperature.
关键词： Bistable-phase transition,Thin films,Laser deposition,Nanocrystalline materials,Raman spectroscopy
更新于2025-09-23 15:21:01
-
Multi-phased cesium lead iodide quantum dots with large stokes shift
摘要： Lead halide perovskite quantum dots (QDs) have emerged as one of the most promising candidates for lighting and biomedical applications. However, further applications are limited by energy transfer of F?rster resonance energy transfer (FRET) or photon reabsorption between different QDs due to QDs with small Stokes shifts. Here, we first report intrinsic cesium lead iodide QDs with large Stokes shifts from 262 to 289 nm with PL peaks in the range of 630 to 658 nm. We show that the large Stokes shift is attributed to the morphology of QDs with multiple phases. Our results in intrinsic lead iodide perovskite QDs with large Stokes shift may open new avenues in resolving energy transfer in biomedical and lighting applications.
关键词： Energy transfer,Perovskite quantum dots,Large Stokes shift,Luminescence,Nanocrystalline materials
更新于2025-09-23 15:19:57
-
Surfactant mediated TiO2 photoanodes and Cu2ZnSnS4 counter electrodes for high efficient dye sensitized solar cells
摘要： Highly crystallized kesterite Cu2ZnSnS4 (CZTS) nanoparticles with an energy band gap of 1.54 eV and desired elemental compositions were prepared by hydrothermal method. CZTS thin films were prepared on titanium tetrachloride (TiCl4) treated fluorine doped tin oxide (FTO) substrate by doctor blade coating method. Morphological developments of hydrothermal synthesized, sodium dodecyl sulfate (SDS) mediated, TiO2 nanostructured thin films on TiCl4 treated FTO substrate were investigated. The CZTS/FTO counter electrodes (CSs) and TiO2 nanostructured photoanodes were employed in dye sensitized solar cells (DSSCs). DSSCs device with power conversion efficiency of 6.24% have been fabricated. The TiCl4 treated CZTS CEs and SDS mediated TiO2 nanostructure photoanodes provides suitable electrodes for low cost and high efficient dye sensitized solar cells.
关键词： Thin films,CZTS counter electrode,Energy storage and conversion,Nanocrystalline materials,Dye sensitized solar cell
更新于2025-09-16 10:30:52
-
Enhanced Photocatalytic Activity of ZnS:Mn2+ Quantum Dots
摘要： The photocatalytic activity of Mn2+ doped ZnS quantum dots stabilized by glutathione capping agent in aqueous media was studied in situ by photoluminescence spectroscopy. The methylene blue was chosen as model organic dye for photodecomposition under excitation in near UV-range. It is shown that the rate of photodegradation of the methylene blue depends strictly on the concentration of the manganese activator ions and the presence of its own intrinsic defects in the host ZnS crystal lattice. It is found that the most effective photocatalyst are ZnS quantum dots doped with 0.25 at % of Mn2+ providing the total dye decolorization within 5 minutes.
关键词： Mn doped ZnS,photocatalysis,nanocrystalline materials,luminescence
更新于2025-09-16 10:30:52
-
Ag-decorated TiO2 nanofibers for highly efficient dye sensitized solar cell
摘要： For dye-sensitized solar cell, the modification of noble metals plays an important role in improving the light absorption of TiO2 films and reducing the recombination of electrons and holes. The composite photoanode of TiO2 nanoparticles/nanofibers (NP/NF) was prepared and soaked in AgNO3 solution at 0.01 mol/L, and the silver content was obtained according to different reduction times. The power conversion efficiency (PCE) increased from 5.39% to 6.36%. The PCE of composite photoanode increased by 18.0% compared with that of the photoanode without Ag modification.
关键词： TiO2 nanofibers,Ag-decorated TiO2 nanofibers,Solar energy materials,Dye sensitized solar cell,Nanocrystalline materials
更新于2025-09-11 14:15:04
-
MAPbI3 nanowires prepared by a facile Vapor Transfer Method for simple photodetector
摘要： MAPbI3 nanowires have become one of the promising materials for optoelectronic devices. Herein, a simple template-free vapor transfer approach to synthesize MAPbI3 nanowires on various substrates for optoelectronic device developed. High crystalline MAPbI3 nanowires were realized via methyl-ammonium iodide (MAI) vapor transfer treatment with PbI2 nanowires. PbI2 nanowires were prepared by a self-assembled procedure where PbI2 film was recrystallized and converted to nanowires structure with the exposure of dimethylacetamide (DMAC) vapor. On top of that, the density of MAPbI3 nanowires could be modulated by simply tuning the thickness of PbI2 film. The as-fabricated MAPbI3 nanowires photodetector exhibits a satisfying responsivity of 0.115 A W-1 @3V while the rise time is less than 0.63 s and the decay time is less than 0.73 s. The study presents a bright future of MAPbI3 nanowires for optoelectronic application.
关键词： vapor transfer method,organic mixed halide perovskite,nanowires,nanocrystalline materials,photodetector,sensors
更新于2025-09-11 14:15:04
-
The Crystallization Mechanism of the Octahedron-Like Ce <sub/>1-x</sub> Yb <sub/>x</sub> O <sub/>2-x/2</sub> and Ce <sub/>1-x</sub> Lu <sub/>x</sub> O <sub/>2-x/2</sub> Ceria-Based Mixed Oxide.
摘要： The crystal growth process of the octahedron-like Ce0.95(Yb or Lu)0.05O1.975 was studied by the various techniques. It has been found that the oriented attachment mechanism plays the main role during the crystal growth process. The detailed examination of the crystallite growth process was possible thanks to phosphates-addition as a thin film on the oxide surface. The octahedron-like, iso-oriented crystals are built of the small octahedral mixed oxides crystals via the oriented attachment process. The mechanism of the crystal growth of the pure ceria is probably the same but the there is no thin film of the cerium phosphate on the ceria crystals surface.
关键词： nanocrystalline materials,crystal growth,mixed oxides,Ceria
更新于2025-09-10 09:29:36
-
The self-assembly of DyF3 nanoparticles synthesized by chloride-based route
摘要： The series of DyF3 nanoparticles was synthesized for the first time by a chloride-based route, using the water-soluble dysprosium chloride hexahydrate as a precursor. The synthesized nanoparticles have sizes of 3 to 7 nm, which is the smallest reported size for DyF3 nanoparticles. The influence of precursor concentration in an aqueous solution prior to the chemical reaction on the size of nanoparticles was studied. The influence of microwave-assisted hydrothermal treatment was also studied. The analysis of transmission electron microscopy (TEM) data revealed no correlation between the size of synthesized nanoparticles and the concentration of the aqueous solution. The AC/DC magnetic susceptibility of DyF3 nanoparticles was measured. The dipolar ferromagnetic transition for this sample was not observed down to 1.8 K that can be possibly explained by onset of superparamagnetism. The self-assembly of DyF3 nanoparticles was observed for the first time by analysis of XRD and TEM data and the evidence of superlattice formation along (020) and (210) lattice planes over the size of 20–30 nm (4–5 nanoparticles) was obtained.
关键词： X-ray techniques,Self-assembly,Nanocrystalline materials,Colloidal processing,Crystal structure,Electron microscopy
更新于2025-09-04 15:30:14