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- 实验方案
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Self-Floating Carbonized Tissue Membrane Derived from Commercial Facial Tissue for Highly Efficient Solar Steam Generation
摘要： Solar steam generation holds a great promise for practically utilizing solar energy in sea water desalination and sewage purification on a large scale. It has been proven that local heating of the superficial water can maximize the energy efficiency for steam generation. So the photothermal materials are required to float on water while working. However, the fabrication of a photothermal material with self-floating ability, low cost and easy-preparation for solar steam generation is highly challenged. Herein, self-floating carbonized tissue membrane for high efficiency solar steam generation is prepared via the carbonization of the commercial facial tissue. The low-cost and scalable carbonized tissue membrane can float on water without any assistance, and can effectively generate water steam at the rate of 4.45 kg m-2 h-1 with photothermal conversion efficiency of as high as 95 % under 3-sun illumination. The self-floating ability, high solar steam generation performance and low cost make the carbonized tissue membrane to be potential alternative for practical application in the future.
关键词： Self-floating,Membrane,One-step synthesis,Carbon material,Solar steam generation
更新于2025-09-23 15:22:29
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Coumarin-1,2,3-triazole hybrid derivatives: Green synthesis and DFT calculations
摘要： A series of new 1,2,3-triazole-coumarin hybrid system are synthesized from the click reaction between 3-azido coumarin and different aromatic terminal alkyne derivatives in a green manner. All compounds are characterized by IR, NMR and UV–VIS spectroscopy. The experimental observations are further supported by DFT computational studies to investigate the effect of substituents at para position in these compounds.
关键词： CuAAC,1,2,3-Triazole,DFT calculation,Green synthesis,copper (I) catalyst
更新于2025-09-23 15:22:29
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A roadmap for electronic grade 2D materials
摘要： Since their modern debut in 2004, 2-dimensional (2D) materials continue to exhibit scientific and industrial promise, providing a broad materials platform for scientific investigation, and development of nano- and atomic-scale devices. A significant focus of the last decade’s research in this field has been 2D semiconductors, whose electronic properties can be tuned through manipulation of dimensionality, substrate engineering, strain, and doping (Mak et al 2010 Phys. Rev. Lett. 105 136805; Zhang et al 2017 Sci. Rep. 7 16938; Conley et al 2013 Nano Lett. 13 3626–30; Li et al 2016 Adv. Mater. 28 8240–7; Rhodes et al 2017 Nano Lett. 17 1616–22; Gong et al 2014 Nano Lett. 14 442–9; Suh et al 2014 Nano Lett. 14 6976–82; Yoshida et al 2015 Sci. Rep. 5 14808). Molybdenum disulfide (MoS2) and tungsten diselenide (WSe2) have dominated recent interest for potential integration in electronic technologies, due to their intrinsic and tunable properties, atomic-scale thicknesses, and relative ease of stacking to create new and custom structures. However, to go ‘beyond the bench’, advances in large-scale, 2D layer synthesis and engineering must lead to ‘exfoliation-quality’ 2D layers at the wafer scale. This roadmap aims to address this grand challenge by identifying key technology drivers where 2D layers can have an impact, and to discuss synthesis and layer engineering for the realization of electronic-grade, 2D materials. We focus on three fundamental areas of research that must be heavily pursued in both experiment and computation to achieve high-quality materials for electronic and optoelectronic applications.
关键词： transition metal dichalcogenides,2D materials,grand challenges,technology drivers,2D electronics,synthesis,roadmap
更新于2025-09-23 15:22:29
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Structural characterization of Nd-Fe <sub/>3</sub> O <sub/>4</sub> nanoparticles prepared by hydrothermal synthesis method
摘要： Magnetic nanoparticles of Nd-Fe3O4 were prepared by hydrothermal synthesis method, using NdCl3·6H2O and FeCl3·6H2O as the starting materials in this paper. The structure and morphology of nanoparticles were investigated by XRD, FTIR, EDS and TEM. The results showed that, while the addition of Nd at 10% in mole ratio, resulted in the formation of Nd2O3 crystal peak in cubic Fe3O4 nanocrystallites by XRD. The absorption bands of Fe–O, –OH, –O–C–O– and –CH2– were accordant to the correspondent chemical groups by FTIR. The morphology of the prepared nanoparticles exhibited spherical structure and evenly distributed without agglomeration phenomenon by TEM. The elemental composition were mainly consistent with the precursor materials used in the experiment.
关键词： magnetic nanoparticles,hydrothermal synthesis,Nd-Fe3O4,Structural characterization
更新于2025-09-23 15:22:29
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Recent advances in III-Sb nanowires: from synthesis to applications
摘要： The excellent properties of III-V semiconductors have make them intriguing candidates for next-generation electronics and optoelectronics. Their nanowire counterparts further provide interesting geometry and quantum confinement effect which benefit various applications. Among many members of all III-V semiconductors, III-antimonide nanowires have attracted significant research interest due to their narrow direct bandgap and high carrier mobility. However, due to the difficulty of nanowire fabrication, the development of III-antimonide nanowires and their corresponding applications are always a step behind the other III-V semiconductors. Until recent years, because of the advance in the understanding and the fabrication technique, electronic and optoelectronic device based on III-antimonide nanowires with novel performance have been fabricated. In this review, we will focus on the development of the synthesis of III-antimonide nanowire using different techniques and strategies for fine-tuning the crystal structure, composition as well as fabricating their corresponding heterostructures. With such development, the recent progress in the applications of III-antimonide nanowires in electronics and optoelectronics is also surveyed. All these discussion would give valuable guidelines to the design of III-antimonide nanowires for next-generation device utilizations.
关键词： synthesis,application,nanowire,III-antimonide
更新于2025-09-23 15:22:29
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Preparation of hollow yttrium-doped TiO<sub>2</sub> microspheres with enhanced visible-light photocatalytic activity
摘要： Using melamine-formaldehyde polymer microspheres as templates, yttrium-doped TiO2 hollow spheres (Y-TiO2HS) were successfully prepared via a sol-gel method. The as-synthesized samples were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectrum, luminescence spectrum, specific surface area (BET) analysis and porosity analysis. The results indicate that Y doping could increase the thermal stability, reduce the band gap and enhance photocatalytic activity of the TiO2. When the Y doping molar ratio was 1.5%, the Y-TiO2HS presented high surface area (62.651 m2 /g) and photocatalytic degradation rate (about 70%). The corresponding BET value and photocatalytic degradation rate of Y-TiO2HS increased by 3 times and 50%, respectively, compared with those of un-doped TiO2HS.
关键词： synthesis,yttrium doping,hollow microspheres,photocatalytic activity,TiO2
更新于2025-09-23 15:22:29
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Quality Assessment of 3D Synthesized Images via Measuring Local Feature Similarity and Global Sharpness
摘要： Depth-Image-Based Rendering (DIBR) techniques can be used to generate virtual views for free-viewpoint video (FVV) application. However, the DIBR algorithms will introduce geometric distortions that mainly distribute at the disoccluded regions in the synthesized views. It has been demonstrated that conventional 2D quality metrics are not suitable for the synthesized views. In this paper, we propose a new quality model for 3D synthesized images by measuring the block-wise texture similarity and color contrast similarity in critical areas, and global gradient magnitude deviation. A critical area detection module is first employed using a warping method with morphological operation. Then, the critical areas are partitioned into blocks, which are classified as edge blocks, texture blocks, and smooth blocks by computing discrete cosine transform coefficient values. Block-wise texture similarity and color contrast similarity in the corresponding areas are calculated, which are weighted by the size of critical areas. Furthermore, gradient magnitude deviation is measured to quantify global sharpness. Finally, the two scores are pooled to obtain the overall quality. Experimental results on IRCCyN/IVC, IETR and MCL-3D DIBR image databases indicate that our method achieves higher quality prediction accuracy than the state-of-the-art quality metrics.
关键词： view synthesis,Quality assessment,3D synthesized image,Depth-Image-Based Rendering
更新于2025-09-23 15:22:29
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Nitrogen dopedTiO2photoactive in visible light
摘要： In this research TiO2 modified with nitrogen has been prepared. The synthesis method used was sol gel from the hydrolysis of titanium tetrabutoxide with urea solution, combined with a low temperature treatment at atmospheric pressure. The theoretical mole ratio N/Ti was equal to 0.5 and the theoretical mole ratio HNO3/TiO2 was equal to 0.5. The solid obtained was calcined at different temperatures in static air with high heating rate and residence time of 1 hour. The samples were characterized by X-ray diffraction, FTIR Raman and diffuse reflectance spectroscopy, thermodifferential and thermogravimetric analysis and specific surface area. All calcined solids exhibit absorption in the visible range. The Raman spectroscopy and X-ray diffraction revealed for all the heat treatments, the presence of crystalline phases corresponding to anatase and brookite polymorphism. The photocatalytic activity of the catalysts was tested in degradation of an artificial dye under visible light, yielding the best results for the sample treated at 250°C. Our results allow to say that this behaviour is due to the absorption of visible light, good efficiency for the adsorption of the dye and presence of two crystalline phases that decreases the recombination of photogenerated electrons and holes. The synthesis technique used allows obtaining solids with textural and attractive photocatalytic properties.
关键词： photocatalysis,TiO2-N,Characterization,synthesis
更新于2025-09-23 15:22:29
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Photocatalytic Activity of Monosized AuZnO Composite Nanoparticles
摘要： Photocatalytic activity of monosized AuZnO composite nanoparticles with different compositions were synthesized by the one-pot polyol procedure, using the triblock copolymer poly(ethylene glycol)-block-poly(propylene glycol)-blockpoly(ethylene glycol) (PEO-PPO-PEO) as the surfactant. The structure and morphology of the composite nanoparticles were analyzed by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), selected area electron diffraction (SAED), a transmission electron microscope (TEM) and high resolution transmission electron microscopy (HRTEM). The characterization showed that the AuZnO composite nanoparticles were spherical, with narrow particle size distribution and high crystallinity. The Fourier transform infrared spectroscopy (FTIR) study con?rms the PEO-PPO-PEO molecules on the surface of the composite nanoparticles. The investigations by ultraviolet-visible light absorbance spectrometer (UV-Vis) and photoluminescence spectrophotometer (PL) demonstrate well the dispersibility and excellent optical performance of the AuZnO composite nanoparticles. Photocatalytic activity and reusability of the AuZnO nanoparticles in UV and visible light regions was evaluated by the photocatalytic degradation of Rhodamine B (RhB). The experimental results show that the AuZnO composite nanoparticles with a suitable amount of Au loading have stability and improved photocatalytic activity. AuZnO composite nanoparticles are effective and stable for the degradation of organic pollutants in aqueous solution.
关键词： one-pot polyol synthesis,photocatalytic activity,AuZnO composite nanoparticles,optical performance
更新于2025-09-23 15:22:29
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HLS Based Approach to Develop an Implementable HDR Algorithm
摘要： Hardware suitability of an algorithm can only be verified when the algorithm is actually implemented in the hardware. By hardware, we indicate system on chip (SoC) where both processor and field-programmable gate array (FPGA) are available. Our goal is to develop a simple algorithm that can be implemented on hardware where high-level synthesis (HLS) will reduce the tiresome work of manual hardware description language (HDL) optimization. We propose an algorithm to achieve high dynamic range (HDR) image from a single low dynamic range (LDR) image. We use highlight removal technique for this purpose. Our target is to develop parameter free simple algorithm that can be easily implemented on hardware. For this purpose, we use statistical information of the image. While software development is verified with state of the art, the HLS approach confirms that the proposed algorithm is implementable to hardware. The performance of the algorithm is measured using four no-reference metrics. According to the measurement of the structural similarity (SSIM) index metric and peak signal-to-noise ratio (PSNR), hardware simulated output is at least 98.87 percent and 39.90 dB similar to the software simulated output. Our approach is novel and effective in the development of hardware implementable HDR algorithm from a single LDR image using the HLS tool.
关键词： system on chip,high-dynamic range image,low-dynamic range image,field-programmable gate array,high-level synthesis
更新于2025-09-23 15:22:29