Synthesis Of CuS Nanoparticles Research Articles

Phase controllable synthesis of CuS nanoparticles by chemical co-precipitation method: Effect of copper precursors on the properties of CuS

The studies focusing on the synthesis of CuS nanoparticles (NPs) by Chemical Co-Precipitation method (CCP) along with detailed growth mechanism are limited. In addition, the synthesis of CuS NPs in water solvent is highly encouraged as water is served as the best eco-friendly solvent. In the present report, taking the advantage of Cu+1 oxidation in the aqueous medium, CuS NPs were synthesized using CuCl and thiourea (Tu) via CCP in presence of naturally abundant water solvent under open atmosphere. In addition, the effect of different copper precursors (such as CuCl, CuCl2, and CuSO4 in combination with thiourea) and the mole ratio of Cu/S on the properties of CuS NPs were also investigated. XRD analysis showed the single-phase CuS for the combination of CuCl + Tu at Cu/S = 1:2 and CuCl2 (or CuSO4) + Tu at Cu/S = 1:1. For other growth conditions, copper-rich composition with mixed phases was observed. XPS analysis showed both +1 and + 2 oxidation states for copper in CuS NPs synthesized from CuCl and Tu at Cu/S = 1:2. The CuS NPs showed broad absorptions in the UV–Vis and NIR regions due to excitonic absorption and localized surface plasmon resonance (LSPR). The optical band gap energy of CuS NPs was varied in the range of 2.05–2.34 eV, depending on the type of copper precursor and Cu/S mole ratio used. The synthesized CuS NPs have potential applications in the visible solar light-driven dye degradation.

Synthesis of CuS Nanoparticles by Laser Ablation Method in DMSO Media

Effects of laser fluence on the characteristics of copper sulfide (CuS) nanoparticles (NPs), produced by laser ablation method have been investigated experimentally. CuS nanoparticles were synthesized by the pulsed laser ablation of a high purity copper bulk in dimethyl sulfoxide (DMSO). Pulses of a Q-switched Nd:YAG laser of 1064 nm wavelength at 7 ns pulse width and different fluences were employed to irradiate the Cu solid target in DMSO. The Effects of laser fluence on the size, morphology, and structure of produced nanoparticles have been studied. Results show that the size distribution of the generated CuS nanoparticles was augmented by increasing the laser fluence. The rate of CuS nanoparticles production was increased by increasing the laser fluence. The bandgap energy for CuS nanoparticles was calculated to be 3.77–3.94 eV.

Synthesis of CuS nanoparticles and evaluation of its antimicrobial properties in combination withLinum usitatissimumroot and shoot extract

AbstractHydroalcoholic extracts have been prepared from Linum usitatissimum with maceration method, which was later examined for its antimicrobial activity in the presence of CuS nanoparticles by broth macrodilution and agar disc diffusion, and the determination of minimal inhibitory concentration of antibacterial agent required to inhibit growth of a pathogen, i.e. minimal inhibitory concentration and the lowest concentration of an antibacterial agent required to kill a particular bacterium, i.e. minimal bactericidal concentration were well elucidated and evaluated for these materials. The superposition of metal nanoparticles with the L. usitatissimum extracts was found to be effective in the eradication of the bacterial infections, and proved to be a good alternative of antibiotics. Antioxidant content of the extracts was also determined and demonstrated the highest antioxidant activities associated with the shoot of L. usitatissimum (Total phenolic content 1: 128.24 ± 1.127-mg gallic acid equivalents/g...

Synthesis of CuS nanoparticles by a wet chemical route and their photocatalytic activity

CuS nanoparticles (NPs) of few nanometers in size were prepared by a wet chemical method. The structural, compositional, and optical properties of the NPs were characterized by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, micro Raman and Fourier transform infrared spectroscopy, N2 adsorption–desorption isotherms, and UV–Vis diffuse reflectance spectroscopy. The XRD pattern proved the presence of hexagonal phase of CuS particles which was further supported by Raman spectrum. The estimated band gap energy of 2.05 eV for the slightly sulfur-rich CuS NPs is relatively larger than that of bulk CuS (1.85 eV), indicating the small size effect. As-prepared NPs showed excellent photocatalytic activity for the degradation of methylene blue (MB) under visible light. The surface-bound OH− ions at the CuS nanostructures help adsorb MB molecules facilitating their degradation process under visible light illumination. The studies presented in this paper suggest that the synthesized CuS NPs are promising, efficient, stable, and visible-light-sensitive photocatalyst for the remediation of wastewater polluted by chemically stable azo dyes such as MB.

Synthesis of CuS Nanoparticles in Water-in-Carbon Dioxide Microemulsions

The formation of CuS nanoparticles from Cu(NO3)2 and Na2S by the mixing of two separate water-in-carbon dioxide (W/C) microemulsions supported by the sodium salt of bis(2,2,3,3,4,4,5,5-octafluoro-1-pentyl)-2-sulfosuccinate (di-HCF4) was investigated. At a water-to-surfactant ratio of 10 and a copper concentration of 7.8 mM in the aqueous phase, the size of copper sulfide particles ranged from 4 to 6 nm. The temperature−pressure phase diagrams of W/C microemulsions at various electrolyte concentrations in the aqueous phase were also determined. The presence of the electrolytes was found not to affect the cloud-point pressures significantly, even at high concentrations.