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Development of Amorphous SIZO/Ag/Amorphous SIZO Multilayer for High-Performance Transparent Conducting Electrode by Controlling Ag Layer Thickness
摘要： A multilayered transparent conductive film of amorphous SiInZnO/Ag/amorphous SiInZnO (SIZO/Ag/SIZO) was fabricated and characterized. The electrical and optical properties of the multilayers changed with changes in the Ag film thickness. The electrodes with the optimized thickness showed an excellent average transmittance (T_av) of 94.04% and a high figure of merit (FOM) of 38.1 × 10^{-3} Ω^{-1}. As the Ag layer thickness increased over 9 nm, the FOM and sheet resistance decreased. This result could be attributed to the decrease in T_av due to light absorption and reflection from the thick Ag layer.
关键词： TCE,OMO,Amorphous Oxide,Si Doped InZnO
更新于2025-09-23 15:22:29
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Photocatalytic degradation of sulfur black dye over Ce-TiO2 under UV irradiation: removal efficiency and identification of degraded species
摘要： TiO2 and Ce-TiO2 photocatalysts have been synthesized via sol–gel method and characterized by various techniques. Cerium incorporation maintains anatase phase formation, reduces the band gap energy, and inhibits the electron–hole recombination leading to a better photocatalytic response. Photocatalytic activities are explored on the degradation of sulfur black dye under UV light in the presence of H2O2. Photocatalytic reaction parameters have been assessed. Indeed, sulfur black dye color removal reached 92% at the optimal conditions in presence of 1% Ce-TiO2 catalyst. Identification of degradation products of sulfur black dye was achieved by LC/MS.
关键词： Ce-doped TiO2,Photodegradation,LC/MS analysis,Sulfur black dye
更新于2025-09-23 15:22:29
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Polypyrrole microcapsules loaded with gold nanoparticles: Perspectives for biomedical imaging
摘要： We report the facile preparation of polypyrrole microcapsules with a hydrophobic liquid core that is loaded with gold nanoparticles. Through the oxidative polymerization of pyrrole, the polymer is deposited onto the surface of the droplets, which results in the encapsulation of both the liquid phase and the metal nanoparticles. We demonstrate the preparation of the microcapsules loaded with organic solvents (toluene, hexane) or 2-oxoheptyl isothiocyanate (new promising anticancer agent) as the liquid cores and stable or radioactive gold nanoparticles (Au-197 or Au-198 isotopes). The resulting microcapsules have been demonstrated as promising agents for medical applications such as computed tomography or gamma imaging. Moreover, the capsules can be applied as drug carriers, which has been shown in vitro on cancer and normal cell cultures.
关键词： Targeted drug delivery,Gold nanoparticles doped with Au-198,Computed tomography,Anticancer agents,Polypyrrole microcapsules,Gamma imaging
更新于2025-09-23 15:22:29
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Spectroscopic Properties of Er3+-Doped Particles-Containing Phosphate Glasses Fabricated Using the Direct Doping Method
摘要： The effect of the incorporation of Er2O3-doped particles on the structural and luminescence properties of phosphate glasses was investigated. A series of different Er2O3-doped TiO2, ZnO, and ZrO2 microparticles was synthesized using soft chemistry and then added into various phosphate glasses after the melting at a lower temperature than the melting temperature. The compositional, morphological, and structural analyses of the particles-containing glasses were performed using elemental mapping by field emission-scanning electron microscopy (FE-SEM) with energy dispersive x-ray spectrometry (EDS) and x-ray diffraction (XRD). Additionally, the luminescence spectra and the lifetime values were measured to study the influence of the particles incorporation on the spectroscopic properties of the glasses. From the spectroscopic properties of the glasses with the composition 50P2O5-40SrO-10Na2O, a large amount of the Er2O3-doped particles is thought to dissolve during the glass melting. Conversely, the particles were found to survive in glasses with a composition 90NaPO3-(10 ? x)Na2O-xNaF (with x = 0 and 10 mol %) due to their lower processing temperature, thus clearly showing that the direct doping method is a promising technique for the development of new active glasses.
关键词： oxyfluoride phosphate glass,direct particle doping,Er2O3-doped particles,Er3+ luminescence property,phosphate glass
更新于2025-09-23 15:22:29
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Cu-Doped ZnO Electronic Structure and Optical Properties Studied by First-Principles Calculations and Experiments
摘要： The band structure, the density of states and optical absorption properties of Cu-doped ZnO were studied by the ?rst-principles generalized gradient approximation plane-wave pseudopotential method based on density functional theory. For the Zn1-xCuxO (x = 0, x = 0.0278, x = 0.0417) original structure, geometric optimization and energy calculations were performed and compared with experimental results. With increasing Cu concentration, the band gap of the Zn1-xCuxO decreased due to the shift of the conduction band. Since the impurity level was introduced after Cu doping, the conduction band was moved downwards. Additionally, it was shown that the insertion of a Cu atom leads to a red shift of the optical absorption edge, which was consistent with the experimental results.
关键词： absorption spectrum,electronic structure,?rst-principles calculations,Cu doped ZnO
更新于2025-09-23 15:22:29
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H2 gas sensor based on PdOx-doped In2O3 nanoparticles synthesized by flame spray pyrolysis
摘要： In this work, 0–1.0 wt% PdOx-doped In2O3 nanoparticles were successfully synthesized by flame spray pyrolysis (FSP) in a single step for the first time and investigated for gas-sensing applications. The sensing films were fabricated by spin coating and tested towards hydrogen (H2) at various temperatures ranging from 150 to 350 °C in dry air. The powder and sensing film properties were analyzed by X-ray analyses, nitrogen adsorption and electron microscopy. The spherical and cubic In2O3 nanoparticles with diameters ranging from 2 to 20 nm were observed with no apparent secondary phase of Pd or PdOx. Detailed analyses suggested that Pd species might be in the form of PdOx crystallites embedded in and on grain boundaries of In2O3 nanoparticles. From gas-sensing measurements, hydrogen-sensing characteristics of In2O3 nanoparticles were significantly improved by PdOx doping particularly at the optimal Pd content of 0.50 wt%. The optimal PdOx-doped In2O3 sensing film showed a high response of 3526 towards 10,000 ppm H2 at the optimal working temperature of 250 °C. In addition, PdOx doped In2O3 sensing films displayed good stability and high H2 selectivity against various toxic and flammable gases including H2S, NO2, C2H4O, C2H4, C2H5OH and C2H2.
关键词： Flame spray pyrolysis,PdOx doped In2O3,H2 sensor,Semiconducting metal oxide
更新于2025-09-23 15:22:29
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Chromium segregation in Cr-doped TiO2 (rutile): impact of oxygen activity
摘要： This work considers the effect of chromium surface segregation for polycrystalline Cr-doped TiO2 on surface vs. bulk defect disorder. It is shown that annealing of Cr-doped TiO2 (0.04 at% Cr) in the gas phase of variable oxygen activity at 1273 K results in a gradual transition in the valence of chromium at the surface from predominantly Cr3+ species in reduced conditions, p(O2) = 10?12 Pa, to comparable concentrations of both Cr3+ and Cr6+ species in oxidising conditions, p(O2) = 105 Pa. The reported data is considered in terms of defect equilibria leading to the formation of positively and negatively charged chromium in both the cation sub-lattice and interstitial sites. The derived theoretical models represent the effect of oxygen activity on the surface charge and the resulting electric field leading to migration mechanism of charged chromium species.
关键词： Oxygen activity,XPS,Cr-doped TiO2,Segregation,Titanium dioxide
更新于2025-09-23 15:22:29
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Non-doped phosphorescent organic light-emitting devices with an exciplex forming planar structure for efficiency enhancement
摘要： Organic light-emitting devices (OLEDs) consisting of a non-doped phosphorescent dye that inserted in an exciplex forming planar structure have been fabricated, and the thickness of ultrathin phosphor layer is optimized to achieve high efficiency. The results showed that OLEDs based on the exciplex interface and a 0.5 nm thick phosphorescent dye have a power efficiency, a current efficiency, and an external quantum efficiency of 37.4 lm/W, 40.5 cd/A, and 14.3%, respectively, which are almost two-folds higher than those with non-exciplex interface devices. Meanwhile, the efficiency roll-off is significantly suppressed. These improved device performances are attributed to the elimination of triplet energy leakage from exciplexes to constituting molecules, efficient energy up conversion of triplet exciplexes and complete host-guest F?rster energy transfer. These results will provide an easily-fabricated and time-saving approach for high-performance OLEDs.
关键词： non-doped,planar structure,Organic light-emitting device (OLED),exciplex,phosphorescent dye
更新于2025-09-23 15:22:29
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Preparation of La doped ZnO ceramic nanostructures by electrospinning–calcination method: Effect of La3+ doping on optical and photocatalytic properties
摘要： Ceramic nanostructures of ZnO doped with La3+ ions (0.02%, 1%, 2% and 4%) were prepared by electrospinning-calcination method. Polyvinylpyrrolidone (PVP) was used as an additional polymer to promote the electrospinning. And, the intermediate electrospun products were processed thermically at 700 °C for 3 h. The produced materials were characterized morphologically and structurally by using scanning/transmission electron microscopy (SEM/TEM) and X-ray diffraction (XRD). The XRD patterns showed the successful incorporation of La ions in the hexagonal wurtzite structure of ZnO. Optical band gaps of these ceramic nanostructures were estimated from reflectance data using Kubelka-Munk theory and were found to vary from 2.589 to 2.889 eV, depending on La3+ doping concentration. Photoluminescence spectra of undoped/doped ZnO with different contents of La3+ ion were investigated. The decay curves for the La3+ ion doped ZnO nanostructures were measured and the average lifetime was found to increase from 2.69 to 2.80 ns when La3+ content increased from 0 to 4%. The photocatalytic activity of doped products (ZnO:La) was investigated by using Congo-Red dye as a probe molecule for degradation under UV-light. Maximal color removal efficiency (97.63%) was observed experimentally for ZnO doped with 2% La3+ in dosage of 0.283 g/L. Finally, the recovered catalyst was thermally activated at 700 °C (1 h) and then successfully reused for the dye photodegradation.
关键词： La-doped ZnO nanostructures,Photodegradation kinetics,Photocatalyst,Optical properties,Electrospinning
更新于2025-09-23 15:22:29
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Synthesis of Mn doped ZnO nanopowders by MW-HTS and its structural, morphological and optical characteristics
摘要： In this study, undoped and Mn doped ZnO nanopowders were synthesized by using the microwave assisted hydrothermal (MW-HTS) method. Doping ratio of Mn in the ZnO was set to 1, 5 and 10%. The effect of Mn concentration on the structural and morphological properties of ZnO nanopowders was investigated using XRD, SEM, XPS and FTIR. XRD results showed that the nanopowders have hexagonal wurtzite structure. The lattice parameters increased with increasing Mn incorporation. SEM images showed that all the samples were formed in nanorod structure and the average diameter of the rods decreased with the Mn concentration. XPS results veri?ed the presence of Mn as a doping element into ZnO crystal lattice and the oxidation states of Mn and Zn. The chemical interactions of ZnO and ZnO:Mn nanopowders were determined for using FTIR spectrum.
关键词： FTIR,Mn doped ZnO,XPS,Microwave assisted hydrothermal,Nanorods
更新于2025-09-23 15:22:29