Flower-like CuS Research Articles

Controlled Synthesis of Hierarchical Flower-Like CuS Spheres by a Facile Microwave Hydrothermal Method

–Hierarchical flower–like CuS spheres have been synthesized by a facile microwave hydrothermal (MH) method using cetyltrimethylammonium bromide (CTAB) as the surfactant. The as–prepared CuS crystallites under different CTAB contents were characterized by X–ray diffraction (XRD), field–emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). Results show that the CTAB–assisted CuS particles have hierarchical flower–like microstructures that were assembled by thin nanoflakes with thickness of 10~20 nm. The corresponding HRTEM images reveal that these nanoflakes are composed of many nanoparticles with average size of about 7 nm. Moreover, when increasing the CTAB contents from 0 g⁄mL to 0.02 g⁄mL, the as–prepared CuS particles were found to have better dispersion stability with decreased average sizes of the hierarchical flower–like spheres. Comparing with the bulk CuS particles, the related UV–vis absorption spectrum of the as–prepared crystallites exhibits an obvious red shift with the absorption peak at 739 nm.

Controlled synthesis of hierarchical CuS architectures by a recrystallization growth process in a microemulsion system

Nano- and micro-sized hierarchical copper monosulfide (CuS) architectures composed of nanoplates have been successfully synthesized via a recrystallization growth process in a microemulsion system. In our method, the spatial separation of two reactants and low-reaction temperature can decrease the rate of growth of the CuS nuclei, resulting in the formation of the poorly crystallized CuS aggregates in an oil-in-water (o/w) microemulsion. The hierarchical CuS nanostructures are formed easily from poorly crystallized CuS by a recrystallization growth process at a higher temperature. Furthermore, the flowerlike CuS architectures can be obtained by a kinetically controlled dissolution–recrystallization mechanism. In addition, the photocatalytic activity of the hierarchical CuS architectures has been evaluated by the degradation of methylene blue solution in the presence of hydrogen peroxide under natural light, showing that the as-prepared hierarchical CuS architectures exhibit high-photocatalytic activity for the degradation of methylene blue.

3D Flowerlike Copper Sulfide Nanostructures Synthesized from Copper (I) Oxide Hollow Microspheres

In the present work, 3D flowerlike CuS nanostructures were synthesized via a facile hydrothermal process using Cu2O hollow microspheres as templates. Reaction of Cu2O hollow microspheres with thioacetamide at 40°C for 2h followed by hydrothermal treatment at 120°C for 12h resulted in high yield of 3D flowerlike structure with diameters ranging from 200 to 300nm. The Influence of experimental parameters on the morphology of the CuS nanostructures was investigated in detail. Different stages of the formation process were studied and thus the formation mechanism of the 3D flowerlike CuS nanostructures was presented.

3D Flowerlike Copper Sulfide Nanostructures Synthesized From Copper (Ⅰ) oxide Hollow Microspheres

Abstract In the present work, 3D flowerlike CuS nanostructures were synthesized via a facile hydrothermal process using Cu2O hollow microspheres as templates. Reaction of Cu2O hollow microspheres with thioacetamide at 40 °C for 2 h followed by hydrothermal treatment at 120 °C for 12 h resulted in high yield of 3D flowerlike structure with diameters ranging from 200 to 300 nm. The Influence of experimental parameters on the morphology of the CuS nanostructures was investigated in detail. Different stages of the formation process were studied and thus the formation mechanism of the 3D flowerlike CuS nanostructures was presented.

Low temperature growth of CuS nanoparticles by reflux condensation method

We report a facile, low-temperature soft solution route to synthesize copper sulfide (CuS) nanomaterials with different morphologies by reflux condensation method. CuS nanomaterials were synthesized without the assistance of additional surfactant or templates, and the influence of key synthetic parameters namely solvent medium and sulfur source on the final structure of CuS was comprehensively investigated. XRD pattern of the synthesized products revealed the formation of hexagonal structure of covellite CuS. SEM analysis showed that the CuS products synthesized in water were ball-like microspheres and the products prepared in ethanol were spherical shaped CuS nanocrystals, but those synthesized in ethylenediamine were flower-like CuS hierarchical network consisting of self-assembled nanoflakes as primary building units. DRS exhibited the characteristics broadband absorption of CuS in near-IR region. The optical band gap of the CuS nanocrystals was in the range between 2.35 eV and 2.81 eV, exhibiting considerable blue shift due to quantum size effects. Electrical resistivity measurements confirmed the semiconducting nature of CuS. On the basis of experimental results, the plausible formation mechanism of different CuS nanostructures was put forward and discussed briefly.

Room temperature synthesis of flower-like CuS nanostructures under assistance of ionic liquid

Flower-like CuS nanostructures have been synthesized via a liquid precipitation route by the reaction between CuCl2·2H2O and thioacetamide (CH3CSNH2, TAA) in the ionic liquid 1-butyl-3-methyl imidazole six hexafluorophosphoric acid salts ([BMIM][PF6]) aqueous solution at room temperature. The products were characterized by X-ray powder diffraction (XRD), field emission scanning electronic microscopy (FESEM), Brunauer-Emmett-Teller (BET), Ultraviolet-Visible Spectrophotometer (UV-Vis) and Photoluminescence (PL) techniques. The as-prepared CuS nanostructures have a mean diameter of about 1 μm. A plausible mechanism was proposed to explain the formation of CuS nanostructures. The effects of experimental parameters on the formation of the products were also explored. With BET theory, it is found that the as-prepared CuS nanostructures have a specific area of 39m2/g. The Barrett-Joyner-Halenda (BJH) pore size distribution of the as-prepared CuS nanostructures presents smaller pores centers about 60 nm.The UV-Vis and PL curves indicate that the asprepared CuS nanostructures are promising candidates for the development of photoelectric devices.

Simple Synthesis of Flower-Likeln2S3Structures and Their Use as Templates to Prepare CuS Particles

Flower-like structureIn2S3particles are prepared by a simple and rapid method. The reaction proceeds in a polyalcohol system without using any complex precursors. The phase and morphology of theIn2S3are investigated. Furthermore, flower-like structure CuS particles are synthesized via the reaction ofCu2+ions with the obtainedIn2S3as templates. Both theIn2S3and CuS particles can be used in preparing compound solar cell materialCuInS2.

Controlled synthesis of various hierarchical nanostructures of copper sulfide by a facile microwave irradiation method

Hierarchical flower-like spheres and self-assembled chains of copper sulfide have been synthesized by a facile microwave irradiation. The as-obtained products were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR) spectroscopy. The SEM and TEM results showed that three-dimensional (3D) flower-like CuS spheres are constructed by a number of two-dimensional (2D) nanosheets as primary building units, whereas the one-dimensional (1D) hierarchical chains are formed by the oriented attachment of the 3D flower-like spheres of CuS. The influences of the additive EDTA, concentration of reactants, microwave power, and reaction time on final morphology and assembled structure of the products were systematically investigated. On the basis of our experimental results, a phenomenological elucidation of the mechanism for the growth of the CuS architectures has been presented, and the driving force for the self-assembly of the nanoplates can be attributed to interfacial tension and the interaction between the hydrophilic surfaces of CuS nanoplates. EDTA acts as both a chelating reagent and a surface capping agent in the synthesis process. Moreover, the optical property of the flower-like CuS microspheres was measured by UV–vis absorption spectroscopy.

Self-assembly of CuS nanoflakes into flower-like microspheres: Synthesis and characterization

Using Cu(S 2CNEt 2) 2 as a single-source precursor and ethylamine solution (65–70%) as the reaction medium, large-scale flower-like CuS microspheres have been synthesized via a solvothermal treatment in the presence of a surfactant. The products were characterized by XRD, SEM, TEM, HRTEM, and UV-vis spectrum. The assembled microspheres, with a diameter of about 2–3 μm, were composed of single-crystalline hexagonal CuS nanoflakes with a thickness of several tens of nanometers. It was revealed that the solvent medium, the surfactant, and the reaction time have great influence on the morphology and size of the resulting CuS products.

Synthesis and characterization of tubular CuS with flower-like wall from a low temperature hydrothermal route

Tubular copper sulfide (CuS) microcrystal and flower-like CuS microsphere have been synthesized by simple hydrothermal route at 75°C using CuCl 2·2H 2O as Cu-precursor, C 2H 5NS as S-source and CTAB as the template. The effect of concentration of reactants and template molecules on morphology has been discussed. X-ray diffraction pattern suggests that the CuS crystals are pure hexagonal phase. The morphology of the products has been studied by scanning electron microscope analysis. The absorption peaks of CuS in UV and near-IR regions indicate that the as-prepared CuS are promising in the development of photoelectric devices.