Synthesis Of Copper Sulfide Research Articles

Synthesis of Copper Sulfides by Anion Substitution and their Resistive Switching Properties in the Presence of Cuprou‘s

AbstractCopper sulfides exhibit various significant physical properties and have wide potential applications. In order to synthesize copper sulfides and investigate the anion substitution possibility of Cu3P, we immersed Cu3P in sodium sulfide solution. From X‐ray diffraction spectra results, copper sulfides, namely Cu2S and Cu7.2S4, were observed, indicating that anion substitution between S2− and P3− ions did occur. Consequently, we investigated the resistive switching (RS) properties of these two phases in the presence of Cu3P. We found that the Cu2S‐Cu3P composite exhibited a high Off/On ratio (88) and a long retention time (>103 s). However, the Cu7.2S4‐Cu3P composite exhibited no RS performance. In addition, we discussed the conduction and resistive switching mechanisms. Our work enriches the preparation method of copper sulfides and provides a reference for enhancing RS performance.

Synthesis of copper sulfide (CuxS) films by one-step thermal reduction of copper formate–amine–sulfur complex pastes with low sulfur ratios

A one-step thermal-reduction method was used to synthesize copper sulfide (CuxS, x = 1–2) films using copper formate–sulfur–amine pastes with low sulfur ratios (sulfur/copper formate = 0.5–1.0). The synthesized films were mixtures of Cu + Cu2S, Cu2S + Cu1.8S, or Cu1.8S + CuS, depending on the sulfur ratio. Cu1.8S alone films were synthesized from the paste with a sulfur ratio of 0.75 at 200 °C. The films comprised single-crystal nanoparticles with a size of 10–20 nm, which were covered with excess sulfur and agglomerated to form pillar-like structures. The amount of excess sulfur increased with an increasing sulfur ratio in the paste. The formation of pillar-like structures was due to the individual nanoparticles being connected by excess sulfur and the evaporation of CO2, H2O, and amine during the thermal reduction of copper formate.

Structural properties of sulfur copper (CuS) nanocrystals grown by chemical bath deposition

In this paper, we present preliminary results in the synthesis of copper sulfide (CuS) nanocrystals, applying the Chemical Bath Deposit technique and subsequent thermal treatment at 1000 °C in air atmosphere. The crystalline growth is systematically performed at two different reaction temperatures of 20 °C and 90 °C. The powders are investigated by applying the techniques of Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and differential scanning calorimetry (DSC). SEM images showed morphology with crystalline conglomerates on the surfaces, and energy dispersive spectrometry (EDX) spectra shows of Cu, S and O elements. The materials show surface morphological differences associated with the temperature of the crystalline growth and the effect of temperature thermal treatment on texture, grain size, and grain boundaries. XRD identifies a hexagonal phase in CuS20 and CuS90 samples, as well as the transition to CuS(s)→CuO(s). The grain for size for the 20 °C and 90 °C is ∼3.7-5.7 nm, and ∼14.2–35.2 nm respectively. The FTIR analysis shows bands identified with the CO32- and OH− ions located at range ∼1000−2000 cm-1 which was generated by thiourea hydrolysis. These bands decrease with thermal treatment up to disappear completely. The DSC plots show the changes associated with the structural transition of CuS(s)→ CuO(s). This structural behavior is associated with the thermal stability properties of the CuS and CuO.

Copper Sulfide (CuxS) Nanowire‐in‐Carbon Composites Formed from Direct Sulfurization of the Metal‐Organic Framework HKUST‐1 and Their Use as Li‐Ion Battery Cathodes

AbstractLi‐ion batteries containing cost‐effective, environmentally benign cathode materials with high specific capacities are in critical demand to deliver the energy density requirements of electric vehicles and next‐generation electronic devices. Here, the phase‐controlled synthesis of copper sulfide (CuxS) composites by the temperature‐controlled sulfurization of a prototypal Cu metal‐organic framework (MOF), HKUST‐1 is reported. The tunable formation of different CuxS phases within a carbon network represents a simple method for the production of effective composite cathode materials for Li‐ion batteries. A direct link between the sulfurization temperature of the MOF and the resultant CuxS phase formed with more Cu‐rich phases favored at higher temperatures is further shown. The CuxS/C samples are characterized through X‐ray diffraction (XRD), thermogravimetric analysis (TGA), transmission electron microscopy, and energy dispersive X‐ray spectroscopy (EDX) in addition to testing as Li‐ion cathodes. It is shown that the performance is dependent on both the CuxS phase and the crystal morphology with the Cu1.8S/C‐500 material as a nanowire composite exhibiting the best performance, showing a specific capacity of 220 mAh g−1 after 200 charge/discharge cycles.

Synthesis of copper sulfides with different morphologies in DMF and water: catalytic activity for methyl orange reduction

Copper sulfides (covellite, digenite and djurleite) were synthesized using microwave irradiation. Copper acetate and thiourea were chosen as precursors and used at a fixed ratio. Crystalline phase and morphology (particles, spheres and inter-grown belts) were changed by only changing the synthetic media (water, DMF and a 1:1 V/V mixture of them). A domestic microwave oven was used at 1000 watt for only 20 s for each synthesis. The obtained samples were characterized using powder XRD, FESEM, and EDX; results were used to postulate the differences in phase and morphology of the obtained samples. All samples were tested as reduction catalysts for methyl orange degradation by NaBH4 and time-dependent UV–vis spectroscopy was used to compare their activity.

Formation of Size-Quantized Copper Immobilized in Langmuir−Blodgett Films of 2,4-Dihydroxybenzilidine-4‘-(hexadecylamino)benzylamine

Synthesis of copper sulfide and stable copper (Cu(0)) nanoparticles in Langmuir−Blodgett films of the amphiphilic benzilidine derivative 2,4-dihydroxybenzilidine-4‘-(hexadecylamino)benzylamine (BHD...

A new approach to an old experiment

Using the synthesis of copper sulfide from its elements to exemplify the concept of theory-laden observations.

The synthesis of some copper sulfides and copper sulfosalts in 500–700 gram quantities

The anhydrous synthesis of some common copper sulfides and copper sulfosalts is described. For each synthesis, 500–700 grams of reagent-grade material was prepared. Direct sulfurization of the metal was used to make CuS (covellite), Cu 2S (chalcocite) and FeS (troilite). A sinter-reaction technique, employing the above simple sulfides, was used to prepare CuFeS 2 (chalcopyrite), CuFe 2S 3 and Cu 5FeS 4 (bornite). Sulfurization of Cu-As or Cu-Sb alloys was used to synthesize Cu 3AsS 4 (enargite) and Cu 12Sb 4S 13 (tetrahedrite), respectively.