Synthesis Of CuS Research Articles

Synthesis of CuS and CuS/C-150 for application in battery type electrode and analysis via electrochemical impedance spectroscopy

Synthesis of CuS and CuS/C-150 for application in battery type electrode and analysis via electrochemical impedance spectroscopy

Synthesis, characterization, and humidity-responsiveness of guar gum xanthate and its nanocomposite with copper sulfide covellite

A novel conjugation of guar gum with xanthate groups via facile aqueous xanthation reaction has been reported. Density of grafted xanthate on guar gum product (GG-X) is as high as 4.4%, thus GG-X is conceivably characterized and confirmed by various spectrometric, electrochemical, thermogravimetric, and microscopic methods. Complexation of GG-X with numerous borderline and soft metal ions (e.g. Fe2+, Co2+, Ni2+, Cu2+, Pb2+, Pt2+ and Cd2+) yields hydrophilic gel-like materials and shows good agreement with hard and soft acid and base (HSAB) theory. This indicates tremendous potential of GG-X in metal ion extraction, removal and hydrogel cross-linking. GG-X is also employed to formulate an aqueous colloidal dispersion of copper sulfide covellite (GG-X/CuS) nanocomposites. GG-X therefore behaves as a surfactant, allowing formation of electronically conductive nanocomposites. XRD indicates apparent beneficial effects of GG-X in the synthesis of CuS with a crystallite size of 15.6 nm. This novel nanocomposite is a promising material for humidity sensing, showing reversible linear responses to relative humidity changes within 10 to 80% range. The interaction between GG-X and water might cause changes in electrical permittivity of GG-X/CuS nanocomposite and/or electrical hopping conductivity between CuS nanoparticles.

CuS, In2S3 and CuInS2 nanoparticles by microwave-assisted solvothermal route and their electrochemical studies

The synthesis of CuS, In2S3 and CuInS2 nanoparticles by microwave irradiation of single source precursors is reported. Monodispersed nanoparticles with spherical morphology, whose average particle size were 2.3 nm (CuS) and 15.2 (In2S3) were obtained for the binary sulphides, while the ternary nanoparticles (CuInS2) displayed spindle shape morphology with some degree of agglomeration. The CuS, In2S3 and CuInS2 exhibited hexagonal, orthorhombic and wurtzite crystalline phases respectively. The electrochemical properties of the nanoparticles were studied using electronic impedance spectroscopy (EIS), cyclic and square wave voltammetry (CV and SWV). Results from the cyclic voltametric measurement showed that the modified electrodes exhibited a reversible redox reaction and typical faradic pseudo capacitance behaviour in 5 mM [Fe(CN)]4–/[Fe(CN)]3– aqueous electrolyte. The evaluated anodic current density of each electrode on a glassy carbon electrode (GCE) was found to follow the order: CuS (2.24 A/m2) > GCE (1.17 A/m2) > CuInS2 (0.699 A/m2) > In2S3 (0.632 A/m2), while the electroactive surface areas were 0.034, 0.0832 and 0.057 0 cm2 for GCECuS, GCEIn2S3 and GCECuInS2 respectively. The electron lifetimes of GCEbare, GCECuS, GCEIn2S3 and GCECuInS2 were also estimated, which gave 0.398, 0.275, 0.730 and 0.433 ms respectively. The lower charge transfer resistance and longer electron lifetime observed for the CuS nanoparticles compared to In2S3 and CuInS2 nanoparticles indicated a more efficient controlled surface for electrochemical process. Therefore, the nanoparticles could be employed as photoanodes in photovoltaic application to undergo oxidation on the electroactive species. EIS analysis of GCEIn2S3 and GCECuInS2 showed that the indium containing materials possess good electrocatalytic activity.

One‐Pot Synthesis of CuS Nanoflower‐Decorated Active Carbon Layer for High‐Performance Asymmetric Supercapacitors

AbstractCopper sulfide‐active carbon (CuS‐AC) with a three‐dimensional (3D) porous structure is fabricated based on AC‐supported CuS nanosheets by using a solvothermal method and used in a high‐performance asymmetric supercapacitor devices to enhance the specific capacitance, cycling stability, and energy density. The CuS nanosheets form an array on the AC layer, and the two kinds of materials are ideally combined, leading to increased conductivity and enlarged electroactive surface area of the electrode materials. Moreover, the 3D CuS‐AC porous structure exhibited excellent electrochemical energy storage properties with large specific capacitance (247 F g−1 at a current density of 0.5 A g−1), high energy density (24.88 Wh kg−1 at the power density of 800 W kg−1), and good long‐term cycling stability (92% capacitance retention after 5000 cycles). This superior electrochemical performance can be ascribed to the high pseudocapacitance of CuS and large surface area from AC. The experimental results indicate that the hierarchical nanostructure design of CuS grown on AC exhibits considerable potential for supercapacitor applications.

Synthesis of CuS and ZnO/Zn(OH)2 nanoparticles and their evaluation for in vitro antibacterial and antifungal activities

In this study, the copper sulfide nanoparticles (CuS‐NPs) and the zinc oxide/zinc hydroxide nanoparticles ((ZnO/Zn(OH)2‐NPs) were synthesized by a simple and low‐cost method, and the synthesized nanoparticles were characterized and identified by UV–Vis, field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM) and X‐ray diffraction (XRD). The antimicrobial activity of the CuS‐NPs and the ZnO/Zn(OH)2‐NPs were examined by broth dilution to determine the minimal inhibitory concentration (MIC) of antibacterial agent required to inhibit the growth of a pathogen and the minimum bactericidal concentration (MBC) required to kill a particular bacterium. Agar disc diffusion method was used to determine the zone of inhibition. The nanoparticles demonstrated potent antibacterial activity against Klebsiella pneumonia (ATCC 1827), Acinetobacter baumannii (ATCC 150504), Escherichia coli (ATCC 33218) and Staphylococcus aureus (ATCC 25293). Antifungal activity against Aspergillus oryzae (PTCC 5164) was also obtained. The data obtained from antimicrobial activities by broth dilution and agar disc diffusion methods exhibited the CuS‐NPs were more effective than the ZnO/Zn(OH)2‐NPs. A good correlation was observed between the data obtained by both methods.

Retracted Article: CuS nanocrystal@microgel nanocomposites for light-regulated release of dual-drugs and chemo-photothermal synergistic therapy in vitro

This article reported the facile synthesis of CuS nanocrystal@microgel nanocomposites that were further developed towards the light-regulated release of dual-drugs and chemo-photothermal synergistic therapy in vitro.

Synthesis of CuS by elemental-direct-reaction in a reline deep eutectic solvent and its catalytic activity in the thermal decomposition of ammonium perchlorate

Micro-sized copper sulfide (CuS) has been successfully synthesized via an elemental-direct-reaction route in a reline deep eutectic solvent at a low temperature condition (50 °C). The copper sulfide was characterized by X-ray diffraction pattern, scanning electron microscopy images, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. The as-synthesized copper sulfide was pure hexagonal phase microspheres (about 4.0–4.3 μm in diameter), which were assembled with randomly oriented thin slices (about 18 nm in thickness). Moreover, the CuS samples showed high catalytic activity for the thermal decomposition of ammonium perchlorate.

Synthesis of CuS and CuS/ZnS core/shell nanocrystals for photocatalytic degradation of dyes under visible light

High quality CuS and CuS/ZnS core/shell nanocrystals (NCs) were synthesized in a large quantity using a facile hydrothermal method at low temperatures of 60°C and evaluated in the photodegradation of Rhodamine B (RhB) under visible light irradiation. Synthesis time plays an important role in controlling the morphology, size and photocatalytic activity of both CuS and CuS/ZnS core/shell NCs which evolve from spherical shaped particles to form rods with increasing reaction time, and after 5h resemble “flower” shaped morphologies in which each “flower” is composed of many NCs. Photocatalytic activity originates from photo-generated holes in the narrow bandgap CuS, with encapsulation by large bandgap ZnS layers used to form the core/shell structure that improves the resistance of CuS towards photocorrosion. Such CuS/ZnS core/shell structures exhibit much higher photocatalytic activity than CuS or ZnS NCs alone under visible light illumination, and is attributed to higher charge separation rates for the photo-generated carriers in the core/shell structure.

Synthesis of CuS and PbS nanocrystals on the basis of PE/NBR polymer/elastomeric composites for their applications

In this research work, we have presented a chemical method to elaborate the PbS, CuS nanocrystals embedded in a polymer composites matrix. We have used polyethylene and nitrile butadiene rubber PE/NBR as a support for synthesis of lead sulfide (PbS) and copper sulfide (CuS) nanocrystals. The size control and morphology of these (PbS and CuS) nanoparticles have been applied by the method of “layer by layer”. The obtained nanoparticles were characterized by X-ray diffraction (XRD), UV–Vis and Atomic Force Microscopy (AFM). UV–Vis spectroscopy was used to determine simple optical responses, getting the biggest transmittances of CuS and PbS nanoparticles. Measured size of CuS nanoparticles is approximately 5.5–90nm in different dose. X-ray diffraction (XRD) study confirmed the formation of cubic phase of PbS nanocrystals into the composite matrix. The size of PbS was estimated ∼9nm. The surface morphology and crystallite sizes were determined by Atomic Force Microscopy measurements.

Synthesis and tribological properties of CuS/ZnS nanoparticles doped polyelectrolyte multilayers

Polyelectrolyte multilayer thin films [poly(diallyl dimethylammonium chloride) (PDDA) and poly(acrylic acid) (PAA)] for the synthesis of CuS and ZnS nanoparticles were prepared. The CuS/ZnS nanoparticles in situ synthesised by immersing the PDDA/PAA polyelectrolyte multilayer thin films into Cu2+(or Zn2+) and Na2S aqueous solutions alternately, which were characterised in detail by UV visible absorption spectroscopy, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) analysis. The CuS and ZnS nanoparticles doped polyelectrolyte multilayer thin films were synthesised by the layer-by-layer molecular deposition technology and in situ synthesis method. The coefficient of friction (COF) decreased with the in situ synthesis CuS and ZnS nanoparticles doped into the polyelectrolyte layers. The in situ nanoparticles exhibited enhanced wear resistance performance of the plain polyelectrolyte multilayers.

Synthesis of CuS and Cu1.1Fe1.1S2 crystals and their electrochemical properties

CuS and Cu1.1Fe1.1S2 crystals have been synthesized by the hydrothermal decomposition of Cu or Cu/Fe diethyldithiocarbamate complex obtained by mixing sodium diethyldithiocarbamate, CuCl2 and FeCl3 in absolute ethanol. CuS crystals with a hexagonal structure exhibit irregular particles with an average size of less than 500nm and rod-shaped morphology with a diameter of less than 100nm. Cu1.1Fe1.1S2 crystals with a cubic structure contain irregular particles and some rod-shaped structures with length and diameter of about 1μm and less than 100nm, respectively. The electrochemical responses of the Cu1.1Fe1.1S2 crystal modified glassy carbon electrode in NaCl and PBS solution show the irreversible and semi-reversible electrochemical process, respectively, which may originate from the NaCl, PBS solution and ascorbic acid. The Cu1.1Fe1.1S2 crystal modified electrodes exhibit definite potential to be used as the electrochemical sensors for detecting cysteine and ascorbic acid.

Synthesis and Photophysical Properties of CuS Nanoparticles Stabilized by Sodium Polyphosphate

We have synthesized nanosized colloidal CuS particles which exhibit quantum size effects. Using an indirect synthesis of CuS from CdS nanoparticles of known average size, we have determined the dependence of the width of the forbidden band (the gap) of the CuS nanoparticles on their size. We have studied the effect of the CuS colloid synthesis conditions on their spectral characteristics.