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Impact of molarity on structural, optical, morphological and electrical properties of copper oxide thin films prepared by cost effective jet nebulizer spray pyrolysis technique
摘要： Copper oxide (CuO) thin films were prepared by simple and cost effective jet nebulizer spray pyrolysis method with different molar concentration 0.1, 0.2 and 0.3 M named as J1, J2 and J3 respectively. The impact of molarity on structural, optical, morphological and electrical of properties of CuO thin film was studied. The structural studies confirmed that the prepared CuO thin films are monoclinic crystal structure matching with standard JCPDS card No. 89-5899. The thickness of CuO thin films determined by surface profilometer found to be increasing while increasing molar concentration. The optical energy band gaps were determined using Kulbelka–Munk (K–M) method are found to be 2.1 eV, 1.9 eV and 1.8 eV for J1, J2 and J3 respectively. The morphological properties and chemical composition of CuO thin film were investigated via field-emission scanning electron microscope (FESEM) and energy dispersive analysis from X-ray spectroscopy (EDAX). According to FESEM all the prepared CuO thin films are well covered and adhered to the substrate with good homogeneity and EDAX spectra confirms the presence of copper (Cu) and oxygen (O). The adhesion strength has been determined in accordance with test method D3330 using scotch tape test. The electrical conductivity of CuO thin films were investigated. The maximum conductivity value of the CuO thin film is observed 2.75 × 10?8 S/cm.
关键词： Thin films,Molar concentration,Copper oxide,Morphological properties,Jet nebulizer spray pyrolysis,Structural properties,Optical properties,Electrical properties
更新于2025-09-09 09:28:46
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Transflective Mesoscopic Nanoparticles Synthesized in the Leidenfrost Droplet as Black Absorbers
摘要： Here, a new class of transflective oxide metaparticles that are able to capture solar radiation in a selective manner based on their size and morphology is demonstrated. The metaparticles possess an electronic polarization response “polarizonics” and show a specular reflective color at the visible frequencies. As a specific highlight, a resonating ultrathin reflective while transparent metacomposite, i.e., a transflective coating is designed. Further, a perfect solar absorber is devised whose function is morphology controlled and supplemented by the transflective coating via the selective interference concept. The multidisciplinary approach presented here enables design of materials with customized functionalities, bridging the sustainable nanochemistry to nanoengineering and proposes a new way for solving challenges in energy and solar harvesting.
关键词： perfect absorber,self-organization,the Leidenfrost chemistry,transflective coating,copper oxide
更新于2025-09-09 09:28:46
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CuO <sub/>x</sub> -TiO <sub/>2</sub> Composites: Electronically Integrated Nanocomposites for Solar Hydrogen Generation
摘要： CuOx-TiO2 (CT) composites were prepared by different methods (impregnation, microwave and photodeposition methods) and evaluated for solar water splitting (SWS) with aqueous methanol. CT composites prepared by three different methods were characterized by relevant methods to understand the correlation between synthesis method and activity, and the mechanism of water splitting. A comparison of photocatalytic activity of CT composite materials indicates that the photocatalyst prepared by photodeposition method shows significantly improved activity for hydrogen production from aqueous methanol as well as with water (overall water splitting) under one sun conditions. Cu is present in Cu/Cu + 1 form in photodeposition method prepared CT, which is more effective and helpful for solar light absorption as well as charge carrier separation due to the formation of bulk p-n (Cu2O-TiO2) heterojunctions. However, CuO formation seems to decrease the activity with other preparation methods.
关键词： titania,solar hydrogen,photocatalysis,copper oxide,heterojunction
更新于2025-09-09 09:28:46
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Structure and morphology of copper oxide composite materials synthesized by the arc discharge method
摘要： Copper oxide is a semiconducting compound with a narrow band gap and is used for photoconductive and photothermal applications. Most of the synthesis methods for the preparation of copper oxide composite materials either are unsuitable for mass fabrication or inevitably introduce unwanted impurities. In this work, we report on the synthesis of copper oxide composite materials by the arc discharge method with a pure copper rod as the anode and graphite as the cathode. Ion beam analysis techniques, particle-induced X-ray emission and Rutherford backscattering spectrometry were used to probe the impurities in the copper oxide composites. Ion beam analysis results revealed copper and oxygen as constituent elements with no impurities. X-ray diffraction results discovered the presence of CuO, Cu2O and Cu phases in the composite materials. The morphology of the as-synthesized copper oxide was studied by scanning electron microscopy. Results clearly demonstrated that spherical particles were obtained with an average diameter of 14 μm (range 2–85 μm), 35 μm (range 20–100 μm) and 50 μm (range 30–120 μm) for the arc current of 60 A, 80 A and 95 A, respectively. It was found that the morphology can be controlled by the arc discharge parameters, e.g. a lower arc discharge current contributed to a smaller particle size. This is because the electric arc current influences the nucleation and the growth of the spherical structures. Due to its simplicity of synthesis, the proposed arc discharge is a promising technique for the fabrication of copper oxide composite materials for optical and electrical applications.
关键词： Copper oxide,arc discharge
更新于2025-09-09 09:28:46