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Silver nanoparticle-loaded filter paper: Innovative assembly method by nonthermal plasma and facile application for the reduction of methylene blue
摘要： In this study, silver nanoparticles (AgNPs) were loaded onto commercial filter paper using a simple “suspending-discharging-washing” process. Nanosecond pulse dielectric barrier discharge (NP-DBD) plasma was used to perform the in-situ reduction-loading process in a plate-to-plate DBD reactor during the five-minute fabrication process. Gaseous ethanol was used as the reducing agent under an argon gas plasma treatment. There was no thermal treatment, which prefers the formation of small nanoparticles. Transmission electron microscopy showed that the synthesized AgNPs were well-dispersed over the surface of the filter paper. The synthesized nanoparticles were hemispherical and crystalline. Fourier transform infrared spectroscopy showed that the cellulose skeletons had been mostly maintained after the plasma discharge. The catalytic activity of the AgNPs paper was evaluated by the reduction reaction of methylene blue (MB) with sodium borohydride (NaBH4) using a straightforward filtration process.
关键词： silver nanoparticles,dielectric barrier discharge,nanoparticles synthesis,nonthermal plasma
更新于2025-11-14 15:14:40
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BaB2O3F2: A New Barium Fluorooxoborate with a Unique (_"∞" ^"2" )"[B2O3F]‐" Layer and Short Cutoff Edge
摘要： The substitution of oxygen by fluorine in borate group offers a brand new materials platform from which intriguing structure and functionality may arise. Here, we report a new fluorooxoborate, BaB2O3F2, synthesized by introducing the F atoms into the BaO-B2O3 system. BaB2O3F2 exhibits a unique oxyfluoride layer and a deep-ultraviolet cutoff edge below 180 nm. The effect of the introduction of F atoms on the structure and optical property has been investigated which should be useful to further expand the borate chemistry and materials.
关键词： deep ultraviolet,synthesis,fluorooxoborate,Aurivillius-type
更新于2025-11-14 15:13:28
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High Temperature One-Step Synthesis of Efficient Nanostructured BiVO4 Photoanodes for Water Oxidation
摘要： Bismuth vanadate (BiVO4) is a promising photoanode material for photoelectrochemical water splitting due to its well-suited valence band edge and comparatively narrow band gap. Herein, we provide first insights on the high temperature rapid and scalable synthesis of efficient nanostructured BiVO4 photoanodes for water oxidation. Nanostructured BiVO4 films with tunable optical density and porosity from 12 to 80% have been synthesized in few seconds by direct deposition of flame-made BiVO4 nanoparticle aerosols. The impact of BiVO4 film structural properties on the photooxidation performance has been systematically investigated by a set of electrochemical and physical characterizations indicating key directions for its morphological optimization. It was found that the BiVO4 water oxidization performance is mainly determined by two competitive factors, viz. accessible surface area and carrier conductivity through the grain boundaries. Optimization of these two factors increased the photocurrent densities by more than 3 times resulting in ca 1.5 mA cm-2 for sulphite oxidation and ca 1 mA cm-2 for water oxidation with a FeOOH\NiOOH co-catalyst at 1.0 V vs. the reversible hydrogen electrode (VRHE) under simulated one sun illumination. These findings provide novel insights into the structure-activity relationships of high temperature synthesized BiVO4 photoanodes for solar-powered water splitting, and introduce a scalable and low-cost approach for their rapid nanofabrication.
关键词： Flame Synthesis,Bismuth Vanadate,Scalable,One-Step,Photoelectrochemical Water Splitting
更新于2025-10-22 19:40:53
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Structural, photoluminescence and thermoluminescence study of novel Li+ co-activated lanthanum oxide activated with Dy3+ and Eu3+ obtained by microwave-assisted solution combustion synthesis
摘要： Stimulated luminescence of novel La2O3 nanophosphors doped with Dy3+ and Eu3+ and co-activated with Li+, prepared by microwave-assisted solution combustion synthesis, was investigated for the very first time. X-ray diffraction results indicated hexagonal La2O3 crystalline phase. Lanthanide and Li+ doping did not affect the La2O3 crystal structure. Scanning electron microscopy images showed nanoparticle morphologies such as plates, rods and irregular shapes. Photoluminescence spectra of La2O3:Dy3+, Li+ exhibited blue and green emission bands due to Dy3+ transitions. For La2O3:Eu3+, Li+, sharp emission lines, corresponding to the optical transitions of Eu3+ were observed. Thermoluminescence glow curve of La2O3:Dy3+, Li+ previously exposed to beta radiation exhibited a prominent glow peak located at ～46 °C, possibly useful for after-glow or persistent luminescence applications, whereas La2O3:Eu3+, Li+ curve, displayed three intense peaks at ～50, ～110 and ～150 °C. Thermoluminescent signal repeatability and decay curve asymptotic behaviour could place La2O3:Eu3+, Li+ as suitable for medium and high-dose radiation dosimetry applications.
关键词： Dosimetry,Thermoluminescence,Solution combustion synthesis,La2O3 co-doped nanoparticles
更新于2025-10-22 19:40:53
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Microwave-assisted synthesis of FexZn1?xO nanoparticles for use in MEH-PPV nanocomposites and their application in polymer light-emitting diodes
摘要： A one-step microwave-assisted polyol method was used to fabricate FexZn1?xO (x = 0.01, 0.05, 0.10) nanoparticles. Zinc acetate dihydrate, iron (III) acetylacetonate, oleic acid and diethylene glycol were placed in a Teflon-lined reaction vessel. The reaction mixture was heated up to 250 °C for 15 min in a microwave reactor. The surface modification with oleic acid prevented agglomeration of the nanoparticles. The X-ray diffraction analysis revealed characteristics wurtzite hexagonal structure of ZnO and successful incorporation of the Fe dopant into the host crystal lattice. Doping of ZnO by Fe led to bandgap modification as estimated by Tauc plot. The as-prepared nanopowders were dispersed in toluene and mixed with a poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) polymer to make stable homogenous dispersions. Then, the FexZn1?xO/MEH-PPV nanocomposite thin films were prepared by spin coating and used as thin active layers in polymer light-emitting diodes. The thickness of deposited FexZn1?xO/MEH-PPV film was ca. 30 nm and that of reference neat MEH-PPV film was ca. 25 nm. The electroluminescent spectroscopy study showed that direct blending of MEH-PPV with Fe-doped ZnO nanoparticles is a simple and effective approach to significantly increase the luminance intensity of the diode in comparison to the diode fabricated by neat MEH-PPV.
关键词： Polymer light-emitting diodes,FexZn1?xO nanoparticles,Microwave-assisted synthesis,MEH-PPV nanocomposites
更新于2025-10-22 19:40:53
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[IEEE 2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED) - Tbilisi, Georgia (2018.9.24-2018.9.27)] 2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED) - The Nonuniquness of Solutions to the Synthesis Problems of Plane Array by the Prescribed Amplitude Directivity Pattern
摘要： Studies of a nonlinear synthesis problem for plane equidistant array by the prescribed amplitude directivity pattern (DP) are presented. A characteristic feature of problems of this class is the non-uniqueness and branching of solutions depending on the physical parameters of array. The existence of several types of real solutions is shown. More effective complex solutions branch off from such solutions. The methods of finding the curves of branching the solutions and the numerical algorithms to search the optimal synthesized amplitude DPs are presented.
关键词： amplitude DP,non-uniqueness and branching of solutions,curves of branching,Synthesis problem,plane array
更新于2025-09-23 15:23:52
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Combustion synthesis of α-Si3N4 with green additives
摘要： This paper reports the combustion synthesis of α-Si3N4 using green additives of water and alcohol. The addition of water and alcohol is demonstrated to be effective in controlling the reaction kinetics and improving the formation of α-Si3N4 by vapor reactions. With increasing proportion of additives in the starting composition, the content of α-Si3N4 in the product is clearly enhanced. In contrast to the ammonium halides usually employed as additives in the combustion synthesis of α-Si3N4, the green additives used here are nontoxic, noncorrosive, and thus more attractive for industrial applications.
关键词： Silicon nitride,Combustion synthesis
更新于2025-09-23 15:23:52
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[IEEE 2018 25th IEEE International Conference on Image Processing (ICIP) - Athens, Greece (2018.10.7-2018.10.10)] 2018 25th IEEE International Conference on Image Processing (ICIP) - High-Quality Virtual View Synthesis for Light Field Cameras Using Multi-Loss Convolutional Neural Networks
摘要： Although light field cameras record both spatial and angular information, their angular and spatial resolutions are limited when capturing light field data. Thus, it is required to synthesize virtual views. In this paper, we propose high-quality virtual view synthesis based on multi-loss convolutional neural networks (CNN). We adopt multi-loss function for view synthesis in both pixel and feature spaces to increase the angular resolution of light field data. We combine three losses of feature loss, edge loss, and mean squared error (MSE) loss into the multi-loss function. We learn the view synthesis function based on simple three layers of CNN. Experimental results show that the proposed method successfully produces virtual views from light field data and outperforms state-of-the-arts in terms of peak-signal-to-noise ratio (PSNR) and structural similarity (SSIM).
关键词： Convolutional neural networks,loss function,virtual view synthesis,multi-loss,light field
更新于2025-09-23 15:23:52
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Photocatalytic oxidation of aromatic alcohols over silver supported on cobalt oxide nanostructured catalyst
摘要： In this paper, we report an in-situ synthesis of silver supported on cobalt oxide (Ag/Co3O4) nanoparticles (NPs) and studied the catalytic activity of this material as an eco-friendly, simple, recyclable and efficient catalyst for one‐pot photocatalytic oxidation of aromatic alcohols. Ag nanoparticles with the sizes of 2–5 nm supported on spherical Co3O4 with the radius between 40 and 60 nm were synthesized by homogeneous chemical precipitation followed by hydrothermal heating. The as-synthesized catalyst was thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), elemental mapping, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and N2 adsorption-desorption isotherm (BET) analysis. It was observed that the catalysts with 1 wt% of silver loading shows high activity and selectivity toward the target aldehyde product. The effects of different reaction parameters such as reaction time, oxidant and solvent were investigated and studied in detail. The synergistic effect between the surface Ag NPs and Co3O4 nanospheres plays a vital role toward very high catalytic activity.
关键词： Oxide materials,Chemical synthesis,Catalysis,X-ray diffraction
更新于2025-09-23 15:23:52
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Direct patterned growth of intrinsic/doped vertical graphene nanosheets on stainless steel via heating solid precursor films for field emission application
摘要： Vertical graphene nanosheets (VGNs), normally consisting of one to several graphene layers vertically aligned on substrates, are promising in a variety of applications including field electron emitters, gas sensors and energy storage devices. Herein, we report a simple, green, easily scalable and cost-effective strategy of growing both intrinsic and nitrogen (N)-doped VGNs on stainless steel (SS) just by heating the solid thin layers of glucose and/or urea in a resistance-heating furnace. It is interesting that VGNs mainly grow on the roughened regions, which can be attributed to the more nucleation and catalyzing sites on such regions than smooth SS. Meanwhile, the N doping concentration can be adjusted by varying the urea addition. Field electron emission measurement indicates that the obtained N-doped VGNs exhibit excellent field emission with a relatively low turn-on electric field strength (~2.6 V μm?1 at the current density of 10 μA cm?2), large field enhancement factor (~9428) and high stability.
关键词： Green synthesis,Nitrogen doping,Vertical graphene nanosheets,Field electron emission,Direct patterned growth
更新于2025-09-23 15:23:52