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Synthesis, Morphology, Optical and Electrical Properties of Cu <sub/> 1? <i>x</i> </sub> Fe <sub/><i>x</i> </sub> O Nanopowder
摘要： The pure and Fe-doped CuO nanoparticles of the series Cu1?xFexO (x = 0, 0.027, 0.055, 0.097 and 0.125) were synthesized by a simple low temperature sol–gel method. Synthesized samples were characterized by a series of techniques including Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray electron spectroscopy (EDX), Diffuse Reflectance Spectroscopy (DRS), Fourier Transform Infrared Spectroscopy (FTIR), Hall Effect Set-up and Current–Voltage (I–V) characteristics. FESEM analysis shows formation of disc type structure increasing in grain size with Fe concentration in CuO. EDX confirmed the incorporation of iron in CuO. FTIR results of pure and Fe doped CuO samples have confirmed the formation of monoclinic CuO. The optical band gap estimated using Diffuse Reflectance Spectroscopy (DRS) shows the increment in the band gap values with Fe substitution. The Hall measurements show predominantly p-type conduction in all the samples and carrier densities decrease with increased Fe substitution. I–V characteristics of pure and Fe doped CuO nanoparticles show rectification behaviour of Schottky diodes.
关键词： Defect States,Hall Effect,Schottky Diode,Cation Vacancies,Fe-Substituted CuO
更新于2025-11-19 16:56:35
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ZIF-8 derived hollow CuO/ZnO material for study of enhanced photocatalytic performance
摘要： Tetracycline hydrochloride (TC) is a broad-spectrum antibiotic extensively used in medical and veterinary fields. However, its excess harms the environment and human health. Recently, construction of CuO/ZnO heterojunctions has a very good effect in the treatment of organic matter in water. In this study, we used zeolite imidazolate framework (ZIF-8) as initial material to synthesize porous and hollow CuO/ZnO photocatalysts for catalytic degradation of TC. The results show that the synthesized CuO/ZnO has the characteristics of porous hollow polyhedron when the molar ratio of Cu and Zn is 0.1. Obviously, photocatalytic degradation rate was better comparing to CuO/ZnO nanoparticles as well as pure ZnO and CuO particles, respectively, which could reach 87% at 60min under visible light (λ>420 nm) and has good stability. Porous hollow CuO/ZnO composites are very promising for effective and environmentally friendly degradation of tetracycline hydrochloride in water.
关键词： Photocatalysis,Tetracycline hydrochloride,Zeolite imidazolate frameworks (ZIF-8),Hollow CuO/ZnO
更新于2025-11-14 17:04:02
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Complexing agent triethanolamine mediated synthesis of nanocrystalline CuO thin films at room temperature via SILAR technique
摘要： In the present work, nanostructured cupric oxide (CuO) thin films have been successfully deposited on glass substrates by successive ionic layer adsorption and reaction (SILAR) technique at room temperature. The influence of complexing agent as triethanolamine (TEA) on the structural, morphological, optical and electrical characteristics of nanocrystalline CuO thin films have been examined in detail. Structural studies confirm that all the films were polycrystalline nature having a monoclinic crystalline form and displayed (111) and (111) preferential orientations. The estimated crystallite values ranged from 17.47 to 19.95 nm. The surface morphology of CuO thin films was examined through scanning electron microscopy and materials microscope studies. Surface studies revealed that homogeneously distributed CuO nanostructures on the film surfaces. The optical studies showed that band gap energy values of the CuO thin films were increased from 1.33 to 2.00 eV as a function of increasing TEA concentration. Meanwhile, the average transmittance of all the films had increased from 2.5 to 42.5% with the increasing TEA concentration. FTIR studies identified the formation of single phase CuO and chemical bonding of the complexing agent. The resistivity value of CuO thin film synthesized without TEA was 3.74 × 10^5 Ω.cm and the resistivity consequently increased to 509 × 10^5 Ω.cm with TEA concentration of 1.0 M%. A high figure of merit (786×10^{-12} Ω^{-1}) was obtained for complexing agent concentration of 0.25 M%.
关键词： SILAR,Surfactant,TEA,CuO thin film
更新于2025-10-24 16:32:58
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Synthesis, characterization and photo-response of p-type cupric oxide thin films prepared by sol-gel technique
摘要： Cupric oxide (CuO) has been deposited onto glass and n-Si (1 0 0) substrate by sol-gel technique. pH of the sol and annealing temperature during film growth were found to be the key parameters for depositing the above film. Microstructural, optical and bonding environmental studies were performed on the above films. The grain sizes in these polycrystalline films varied between ～50 and 100 nm. Films were preferentially oriented in (?1 1 1) direction. Electrical and galvanomagnetic measurements indicated films to be predominantly p-type with carrier concentration value ～3.47 × 10^15/cm^3 and mobility values ～4.475 cm^2/Vs. A typical p-CuO/n-Si hetero-junction structure has been successfully fabricated with open circuit voltage (VOC) ～359 mV and short-circuit current density (JSC) ～4.65 mA/cm^2, fill factor (FF) ～0.38 and efficiency (η) ～1.05%.
关键词： CuO,Raman,TEM,XRD,XPS,PV
更新于2025-09-23 15:23:52
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Thermal evolution of morphological, structural, optical and photocatalytic properties of CuO thin films
摘要： Nanostructured CuO thin films were synthesized by thermal evaporation and annealing. Structural, optical and morphological changes in the CuO film upon annealing and their overall impact on its photocatalytic activity were investigated employing X-ray diffraction, UV–Vis absorption spectroscopy, atomic force microscopy and field emission scanning electron microscopy. Significant modifications in the morphological, optical, structural and photocatalytic behavior of nanostructured CuO thin film were observed upon thermal annealing. Thermal annealing led to the growth of CuO nanoparticles and the average size of CuO nanoparticles increased from 23 nm to 293 nm as the annealing temperature was increased to 600oC. CuO thin film sample annealed at 400 ? C exhibited superior photocatalytic activities over other samples for the degradation of malachite green and methylene blue dyes in 120 and 160 min, respectively. The improved photocatalytic behavior of CuO thin film annealed at 400 ? C is attributed to its narrower band gap, improved utilization of sunlight and enhanced adsorption of dye due to increased surface area arising from formation of CuO nanoparticles and their aggregates at the surface.
关键词： Methylene blue,CuO,Thin film,Photocatalysis,Malachite green
更新于2025-09-23 15:23:52
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Nanocrystal-engineered thin CuO film photocatalyst for visible-light-driven photocatalytic degradation of organic pollutant in aqueous solution
摘要： We design a thin CuO film photocatalyst for visible-light-driven photocatalytic degradation of methylene blue (MB). Nanocrystal engineering of the photocatalyst is performed by sputtering with concurrent in-situ thermal treatment. The impacts of the in-situ thermal treatment temperature and sputtering conditions on the material properties of the thin CuO film photocatalyst are investigated in detail. Systematic characterization using field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) indicates that deposition at elevated temperature and higher sputtering power significantly improves the surface structure and crystallinity of thin CuO film, which promotes charge transfer and ultimately results in better performance for MB photocatalytic degradation. The best-performing sample is the one sputtered at an elevated temperature of 300 °C and a sputtering power of 300 W. The photodegradation efficiency and physical durability of the samples were also analyzed after using for 5 cycles. The results indicate that in-situ thermal treatment and nanocrystal engineering of the thin CuO film significantly improve the physical durability.
关键词： Thin CuO film photocatalyst,Visible-light-driven photocatalytic degradation,Nanocrystal engineering
更新于2025-09-23 15:23:52
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Synthesis and optical band gap determination of CuO nanoparticles from salen-based infinite coordination polymer nanospheres
摘要： A symmetric bi-carboxylic acid functionalized salen-type ligand was used as organic linker to prepare a Cu-based infinite coordination polymer. The analytical data demonstrated that the proposed structure contains one bi-carboxylic acid salen type ligand and two copper cations in each monomeric unit. One of the Cu2+ cations is coordinated by N2O2 site of salen ligand and the other one acts as node to connect metal-organic linkers to each other. The reasonable formation mechanism for coordination polymer formation proposed which shows the formation of nanoparticles from intertwined oligomer chains. The prepared coordination polymer was used as a good precursor to synthesis copper oxide nanoparticles with larger band gap relative to bulk CuO.
关键词： CuO,salen-type ligand,ICP,band gap,nanoparticles
更新于2025-09-23 15:23:52
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Synthesis of Cu2O/CuO Nanocrystals and Their Application to H2S Sensing
摘要： Semiconducting metal oxide nanocrystals are an important class of materials that have versatile applications because of their useful properties and high stability. Here, we developed a simple route to synthesize nanocrystals (NCs) of copper oxides such as Cu2O and CuO using a hot-soap method, and applied them to H2S sensing. Cu2O NCs were synthesized by simply heating a copper precursor in oleylamine in the presence of diol at 160 °C under an Ar flow. X-ray diffractometry (XRD), dynamic light scattering (DLS), and transmission electron microscopy (TEM) results indicated the formation of monodispersed Cu2O NCs having approximately 5 nm in crystallite size and 12 nm in colloidal size. The conversion of the Cu2O NCs to CuO NCs was undertaken by straightforward air oxidation at room temperature, as confirmed by XRD and UV-vis analyses. A thin film Cu2O NC sensor fabricated by spin coating showed responses to H2S in dilute concentrations (1–8 ppm) at 50–150 °C, but the stability was poor because of the formation of metallic Cu2S in a H2S atmosphere. We found that Pd loading improved the stability of the sensor response. The Pd-loaded Cu2O NC sensor exhibited reproducible responses to H2S at 200 °C. Based on the gas sensing mechanism, it is suggested that Pd loading facilitates the reaction of adsorbed oxygen with H2S and suppresses the irreversible formation of Cu2S.
关键词： CuO,H2S,gas sensor,Cu2O,nanocrystal
更新于2025-09-23 15:22:29
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Electrochemical synthesis of copper(II) oxide nanorods and their application in photocatalytic reactions
摘要： A new way of synthesizing nanoscale copper oxide particles is described in this work. Oxides of an intermediate metal, such as copper oxide, can be used as an effective semiconductor in the photocatalytic reactions once they are prepared in a special way. The CuO nanorods were synthesized electrochemically under surfactant-free, static conditions. The obtained nanorods have an average length of less than 50 nm. The CuO nanorods were used as a heterogeneous catalyst in an aqueous medium. 2,4-Dichlorophenol (DCP) was used as a probe molecule. The CuO nanorods showed an excellent ability to degrade DCP under visible light and without the need for any auxiliary oxidizing agent.
关键词： CuO,DCP,Visible light,Degradation,Nanorods,Heterogeneous catalyst
更新于2025-09-23 15:22:29
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Antibacterial and natural room-light driven photocatalytic activities of CuO nanorods
摘要： The present work is aimed to establish the utility of CuO nanorods in diverse fields; from photocatalysis to antimicrobial applications. The CuO nanorods obtained via facile precipitation process (without any surfactant/ligand) depicted excellent photocatalytic activity when examined under natural diffused room light for the complete degradation of the organic pollutant, Rhodamine B. Neither any assistance of any oxidants nor an additional light sources (e.g., with high power, lower wavelength etc.) was required during the whole process. The antibacterial property was also examined for the CuO nanorods. Effects on the microbial growth were noteworthy; the maximum inhibition zone of 37 mm was noted against the Gram-negative E. coli. The most significant effect of the nanorods was depicted in the reduction of 99% of E. coli, 98% of S. flexneri and 93% of S. aureus cells. The suitable activity response of the nanorods establishes the efficacy of the room temperature synthesis process.
关键词： S.flexneri,E.coli,Antimicrobial,Photocatalysis,S. aureus,CuO nanorods
更新于2025-09-23 15:22:29