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P‐type Sb‐doped Cu <sub/>2</sub> O Hole Injection Layer Integrated on Transparent ITO Electrode for Acidic PEDOT:PSS‐Free Quantum Dot Light Emitting Diodes
摘要： It is developed that transparent p-type Sb-doped cuprous oxide (ACO) integrated Sn-doped In2O3 (ITO) film as hole injection layer (HIL) and anode combined electrodes for quantum dot light emitting diodes (QD-LEDs) to substitute acidic PEDOT:PSS HIL based electrode. By graded co-sputtering of ACO and ITO targets, the graded p-type ACO buffer layer can be integrated on the surface region of the ITO electrodes. P-type conductivity of the ACO film for acting as effective HIL in QD-LEDs is confirmed by a positive Hall coefficient (1.74 (cid:1) 10 (cid:3)1). Due to the well-matched work function of p-type ACO on the ITO electrodes, the acidic PEDOT:PSS-free QD-LEDs exhibited typical current-voltage-luminescence of QD-LEDs. The successful operation of PEDOT:PSS-free QD-LED with p-type ACO integrated ITO electrode indicates that ACO and ITO anode graded sputtering is simpler fabrication steps for cost-effective QD-LEDs and elimination of interfacial reactions caused by the acidic PEDOT:PSS layer for reliable QD-LEDs.
关键词： Sn-doped In2O3,acidic PEDOT:PSS,hole injection layer,p-type conductivity,Sb-doped Cu2O,quantum dots light emitting diodes
更新于2025-11-21 10:59:37
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Effect of Deposition Potential on Synthesis, Structural, Morphological and Photoconductivity Response of Cu2O Thin Films by Electrodeposition Technique
摘要： The present work describes the effect of deposition potentials on structural, morphological, optical, electrical and photoconductivity responses of cuprous oxide (Cu2O) thin films deposited on fluorine-doped tin oxide glass substrate by employing electrodeposition technique. X-ray diffraction patterns reveal that the deposited films have a cubic structure grown along the preferential (111) growth orientation and crystallinity of the film deposited at ? 0.4 V is improved compared to the films deposited at ? 0.2, ? 0.3 and ? 0.5 V. Scanning electron microscopy displays that surface morphology of Cu2O film has a well-defined three-sided pyramid-shaped grains which are uniformly distributed over the surface of the substrates and are significantly changed as a function of deposition potential. Raman and photoluminescence spectra manifest that the film deposited at ? 0.4 V has a good crystal quality with higher acceptor concentration compared to other films. UV–visible analysis illustrates that the absorption of Cu2O thin film deposited at ? 0.4 V is notably higher compared to other films and the band gap of Cu2O thin films decreases from 2.1 to 2.04 eV with an increase in deposition potential from ? 0.2 to ? 0.5 V. The frequency–temperature dependence of impedance analysis shows that the film deposited at ? 0.4 V has a high conductivity. I–V measurements elucidate that the film deposited at ? 0.4 V exhibits a good photoconductivity response compared to films deposited in other deposition potentials.
关键词： Cu2O thin films,Electrodeposition,I–V measurement,Photoconductivity response
更新于2025-11-19 16:46:39
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Visible-light-driven g-C3N4/Cu2O heterostructures with efficient photocatalytic activities for tetracycline degradation and microbial inactivation
摘要： g-C3N4/Cu2O composites were successfully synthesized by a facile chemical precipitation method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM) and UV diffuse reflectance spectroscopy (UV-DRS) techniques were employed to characterize the as-synthesized photocatalysts. The photocatalytic experiments indicated that the g-C3N4/Cu2O composites displayed higher photodegradation activity of tetracycline (TC) and inactivation efficiencies of Escherichia coli (E. coli) as well as Fusarium graminearum (F. graminearum) in comparsion with bare g-C3N4 and Cu2O under visible light irradiation. Photoluminescence (PL) spectra implied that the heterojunction between g-C3N4 and Cu2O could efficiently promote the separation efficiency of photo-induced charge carriers. Active species trapping experiment and electron spin resonance (ESR) analysis revealed that ?O2-, ?OH and h+ played important roles in the photocatalytic process. This study could provide new insights into the design of multifunctional g-C3N4-based photocatalysts for environmental purification.
关键词： inactivation mechanism,tetracycline,heterostructures,photocatalysis,g-C3N4/Cu2O
更新于2025-11-14 15:29:11
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Photocatalytic performance of TiO2 thin film decorated with Cu2O nanoparticles by laser ablation
摘要： Cu2O nanoparticles decorated TiO2 thin films were fabricated by laser ablation. The effects of Cu2O nanoparticles on the structure, optical properties and photocatalytic performance of TiO2 thin film were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Raman spectrometer system, optical absorption and photocatalytic evaluation system, respectively. XRD patterns indicate that the decoration has the effect of lowering the grain orientation of Cu2O. The photocatalytic performance in hydrogen generation of Cu2O decorated TiO2 composite thin film was significantly improved compared with that of either Cu2O nanoparticles or TiO2 single layer thin film with 1.70 and 1.77 times, respectively. The oxidation of Cu2O was demonstrated to dominate the photocatalytic performances of Cu2O/TiO2 composite thin films by varying the laser ablation powers.
关键词： Heterojunction,Cu2O nanoparticles,Laser ablation,Photocatalytic performance,TiO2 thin film
更新于2025-10-22 19:40:53
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Benthic microbial fuel cell equipped with a photocatalytic Cu2O-coated cathode
摘要： In this study, a photocatalytic benthic microbial fuel cell was developed and the cell performance was tested. A photocathode was fabricated by electrodeposition of Cu2O photocatalysts on carbon felt; with a proper deposition time of 15 min, a photocathode with optimal Cu2O compactness and an average Cu2O particle size of 0.97 μm was fabricated and was then covered with an amorphous carbon thin layer. Photoelectrochemical test results prove the pronounced visible light response of the fabricated photocathode. Results show that the coating of carbon thin layer could protect the Cu2O from self-reduction and also improve the photoelectrochemical performance of Cu2O crystalline grains. The photo-benthic microbial fuel cell (BMFC) produces a maximum power density of 249.0 mW m ? 2 and 186.7 mW m?2 under light irradiation and in the dark, which is 17.8 and 13.3 times higher than the common BMFC using carbon felt cathode in parallel, demonstrating the catalytic and photocatalytic effect of the fabricated photocathode. Polarization and EIS results prove the decrease of internal resistance by using the photocathode. The fabricated photocathode could improve the oxygen reduction rate on the cathode side, thus reduce the internal resistance and enhance the BMFC performance.
关键词： Benthic microbial fuel cells,Photocathode,Nanostructured catalyst,Visible light,Cu2O
更新于2025-09-23 15:23:52
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Fabrication and photocatalytic activity of core@shell Ag3PO4@Cu2O heterojunction
摘要： Novel Ag3PO4@Cu2O core@shell heterojunction photocatalysts were fabricated through liquid phase reduction and chemical deposition method. Flower-like structures Cu2O were loaded on the surface of Ag3PO4 nanorods. The prepared Ag3PO4@Cu2O exhibited highly efficient photocatalytic activity for photodegradation of MB under visible-light irradiation. The possible mechanism for the excellent performance of this structure was also established.
关键词： Nanocomposites,Semiconductors,Core@shell,Photocatalytic,Flower-like Cu2O,Ag3PO4 nanorod
更新于2025-09-23 15:23:52
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Quantification of Glucose via in situ Growth of Cu2O/Ag Nanoparticles
摘要： The monitoring of glucose levels in blood is extremely important for the effective control of diabetes. Nanomaterial-based approaches for the quantification of glucose typically require two steps: material preparation and the actual glucose measurement. Herein, we report a single-step method that combines these functions via the in situ growth of Cu2O/Ag nanoparticles (NPs). Mechanistically, we use glucose itself to reduce Cu2+ and Ag+ ions that are stabilized with 3-mercaptopropionic acid (3-MPA) and bovine serum albumin (BSA) under alkaline conditions to form Cu2O/Ag NPs and produce a color change in solution due to plasmonic resonance at 400 nm, which can be related back to the concentration of glucose. We study several factors in this reaction, including the molar ratios of the metal ions and 3-MPA, the reaction time, and the temperature to control the synthesis of the Cu2O/Ag NPs and thus their sensitivity toward glucose. Introducing BSA into the system is a key factor for the quantification of glucose in blood without pretreatment, improving the probe’s limit of detection and reducing the sample volumes to 1 μL. This colorimetric assay based on Cu2O/Ag NPs exhibits excellent sensitivity and specificity toward glucose, and a linear relationship with glucose concentrations ranging from 15 to 300 μM and a limit of detection of 9.2 μM. As proof of concept, we demonstrated that the Cu2O/Ag NP probes could successfully detect glucose in two representative blood samples by neglecting interferences from various common species, demonstrating the potential of this technique in point-of-care analysis.
关键词： plasmonic resonance,3-mercaptopropionic acid,bovine serum albumin,silver nanoparticles,glucose quantification,Cu2O
更新于2025-09-23 15:23:52
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Highly enhanced photocatalytic H2 evolution of Cu2O microcube by coupling with TiO2 nanoparticles
摘要： The improvement of photocatalytic performance could be attributed to the formation of p-n heterojunction. Furthermore, the interface effect of Cu2O and TiO2 caused a broader absorbance in visible light region and the lower recombination of photogenerated electron-hole pairs. It is believed that the Cu2O/TiO2 p-n heterojunction composites could provide an alternative method to design highly efficient photocatalysts for solar energy. The yield remained around 92.6% after three cycles. Hydrogen production of the Cu2O/TiO2 (60 wt. %, labeled as CT-60) exhibits the highest enhanced photocatalytic activities in hydrogen production with H2 evolution 3002.5 μmol/g. CT-60 is 103 and 8.5 fold higher than cubic Cu2O and TiO2 nanoparticles, respectively. The photocatalytic performance of the composite was effectively tuned by controlling the amount of TiO2. A Cu2O/TiO2 p-n heterojunctions composite was created via a facile, controllable, and one-pot hydrothermal method based on cubic Cu2O and TiO2 nanoparticles in the presence of dioctyl sulfosuccinate sodium salt (AOT) surfactant. The TiO2 nanoparticles with average edge length of ~10.1 nm were uniformly distributed on the crystal surface of Cu2O cube {100}.
关键词： superior stability,high hydrogen yield,Cu2O/TiO2,photocatalytic
更新于2025-09-23 15:23:52
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Novel RGO and concave cube Cu <sub/>2</sub> O co-modified BiVO <sub/>4</sub> nanosheets with enhanced photocatalytic and surface adsorption performances of tetracycline
摘要： A novel ternary Cu2O/BiVO4/RGO photocatalyst is successfully constructed by hydrothermal and evaporation-induced method, and it exhibits superior photocatalytic performance for degradation tetracycline (TC). Meanwhile, the visible light absorption range of composite photocatalyst is effectively broadened by the formation of heterojunction with narrow band gap semiconductor Cu2O. And the separation efficiency of the photogenerated electron-hole pairs is significantly enhanced by the synergistic effect of Cu2O and RGO. More importantly, the adsorption of TC by ternary Cu2O/BiVO4/RGO possesses high adsorption capacity, which is 23.73 times higher than that of pure BiVO4. Additionally, the possible reaction mechanism is clearly revealed by radical trapping experiment, electron spin-resonance (ESR) spectroscopy. This work provides a new insight to design a photocatalyst with excellent adsorption to remove organic contaminants in water.
关键词： RGO,Adsorption,synergistic effect,BiVO4,Cu2O,Tetracycline
更新于2025-09-23 15:22:29
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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