- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Self-structuring in Zr1?xAlxN films as a function of composition and growth temperature
摘要： Nanostructure formation via surface-diffusion-mediated segregation of ZrN and AlN in Zr1?xAlxN films during high mobility growth conditions is investigated for 0 ≤ × ≤ 1. The large immiscibility combined with interfacial surface and strain energy balance resulted in a hard nanolabyrinthine lamellar structure with well-defined (semi) coherent c-ZrN and w-AlN domains of sub-nm to ~4 nm in 0.2 ≤ × ≤ 0.4 films, as controlled by atom mobility. For high AlN contents (x > 0.49) Al-rich ZrN domains attain wurtzite structure within fine equiaxed nanocomposite wurtzite lattice. Slow diffusion in wurtzite films points towards crystal structure dependent driving force for decomposition. The findings of unlikelihood of iso-structural decomposition in c-Zr1?xAlxN, and stability of w-Zr1?xAlxN (in large × films) is complemented with first principles calculations.
关键词： phase separation,nanostructure,thin films,self-organization,ZrAlN
更新于2025-09-23 15:21:21
-
Research progress of low-dimensional metal halide perovskites for lasing applications
摘要： Metal halide perovskites have been regarded as remarkable materials for next-generation light-harvesting and light emission devices. Due to their unique optical properties, such as high absorption coefficient, high optical gain, low trapping-state density, and ease of band gap engineering, perovskites promise to be used in lasing devices. In this article, the recent progresses of microlasers based on reduced-dimensional structures including nanoplatelets, nanowires, and quantum dots are reviewed from both fundamental photophysics and device applications. Furthermore, perovskite-based plasmonic nanolasers and polariton lasers are summarized. Perspectives on perovskite-based small lasers are also discussed. This review can serve as an overview and evaluation of state-of-the-art micro/nanolaser science.
关键词： microlaser,laser,nanostructure,emission,perovskite
更新于2025-09-23 15:21:21
-
Preparation of ordered mesoporous Au using double gyroid mesoporous silica KIT-6 via a seed-mediated growth process
摘要： Ordered mesoporous Au was prepared using double-gyroid (cubic Ia3d) mesoporous silica KIT-6 as a template. The Au frameworks were formed within the template via a seed-mediated growth process. Au nanoparticles were initially prepared as seeds within the mesopores, and subsequently, they were grown under mild and controlled reducing conditions. The transmission electron micrographs and scanning electron micrographs of mesoporous Au after the removal of the template revealed the formation of mesoporous Au replicas. The small-angle X-ray scattering pattern of mesoporous Au reveals that the obtained mesoporous Au has a cubic I4132 mesostructure, which is different from that of the original template, implying that Au was deposited within only one mesochannel of the two interconnected ones. The seed-mediated growth process is a key factor in the successful formation of ordered mesoporous Au using a mesoporous silica template. Our preparative method can serve as a guide for further development of synthetic and materials chemistry of mesoporous Au.
关键词： Gold,Nanostructure,Template synthesis,Mesoporous materials
更新于2025-09-23 15:21:21
-
Oxygen-Defected Molybdenum Oxides Hierarchical Nanostructure Constructed by Atomic-Level Thickness Nanosheets as an Efficient Absorber for Solar Steam Generation
摘要： Solar steam generation is a potential approach for fresh water recycling, thus attracting increasing attention recently. To further promote water evaporation rate, some new materials need to be developed, such as plasmonic transition metal oxides. In this work, we report an oxygen-defected molybdenum oxides hierarchical nanostructure (MoOx HNS) composed of ultrathin nanosheets with atomic-level thickness, which is demonstrated as an efficient absorber for solar steam generation. Benefiting from broadband light absorption and special assembled architecture, the resulting MoOx HNS loaded on a PTFE membrane (MoOx HNS Membrane) exhibits excellent performance for boosting steam generation rate. Under 1 sun (1 kW m?2) illumination, the evaporation rate can reach at 1.255 kg m?2 h?1, with the energy conversion efficiency of 85.6%, which is one of the best performance compared with other desalination materials. Meanwhile, the MoOx HNS Membrane can achieve high-performance seawater desalination in both laboratorial and outdoor conditions. The enhanced water evaporation performance can be attributed to the synergistic effects of the efficient solar-to-thermal conversion and the unique channel structure. This work expands the scope of investigated materials which can be applied in seawater desalination system.
关键词： MoOx hierarchical nanostructure,seawater desalination,photothermal conversion,oxygen vacancies,solar steam generation
更新于2025-09-23 15:21:21
-
A facile room-temperature synthesis of three-dimensional coral-like Ag2S nanostructure with enhanced photocatalytic activity
摘要： Morphology is a crucial factor in determining the chemical, optical, and electrical properties of nanoscale materials. In this work, we utilized a facile room-temperature deposition method to synthesize three-dimensional (3D) coral-like Ag2S nanostructures. The formation mechanism of 3D coral-like Ag2S nanostructures was proposed by tracking the reaction process. In comparison with 0D Ag2S nanoparticles and 1D Ag2S nanowires of similar size, 3D coral-like Ag2S nanostructures exhibit higher pore volume, photocatalytic activity and cyclic stability for degradation of methyl orange (MO). Surface photovoltage measurement, electrochemical impedance spectroscopy, and Mott–Schottky analysis showed that compared to other Ag2S nanostructures, 3D coral-like Ag2S nanostructures have the strongest surface photovoltaic response, longest carrier lifetime, and highest carrier density.
关键词： Carrier lifetime,Surface photovoltage,Ag2S,3D coral-like nanostructure,Photocatalytic activity
更新于2025-09-23 15:21:21
-
[IEEE 2018 IEEE International Conference on Semiconductor Electronics (ICSE) - Kuala Lumpur (2018.8.15-2018.8.17)] 2018 IEEE International Conference on Semiconductor Electronics (ICSE) - Engineering the Properties of Nb<inf>2</inf>O<inf>5</inf>-ZnO Nanostructures via Dual Synthesis Techniques
摘要： In this paper, dual techniques; anodization and hydrothermal, were introduced to synthesize the Nb2O5-ZnO nanostructures. The purpose of this research is to engineer the properties of the Nb2O5-ZnO nanostructures which can offer new optical and electrical behaviors and also lead to large surface area. Synthesis of Nb2O5 has been conducted by anodizing the Niobium foil in the electrolyte containing NH4F and ethylene glycol. Meanwhile, ZnO was hydrothermalized with Zinc Nitrate precursor solution for 18 hr at different temperatures. All samples were characterized using FESEM, XRD and UV-Vis absorbance spectra. The morphological and properties changes of the Nb2O5-ZnO nanostructures are systematically investigated as a function of hydrothermal temperature.
关键词： ZnO,dual synthesis,anodization,Nb2O5,nanostructure,hydrothermal
更新于2025-09-23 15:21:21
-
Circumferential growth of zinc oxide nanostructure anchored over carbon fabric and its photocatalytic performance towards p-nitrophenol
摘要： In present study, zinc oxide (ZnO) nanostructure anchored on carbon fabric (CF) was prepared using a combinational techniques of RF magnetron sputtering and hydrothermal method. The sputter seeded CF aided for the circumferential growth of ZnO nanostructure and its structural and optical characterization evidencing the c-axis orientation with the band gap of, 3.21 eV. ZnO nanostructure anchored CF was subjected towards UV light photocatalytic activity of p-nitrophenol for 150 min and remarkably higher activity of 98% was observed with better retrieval and recyclability upto 5 cycles. Because of these conspicuous features, it can serve as an expedient hybrid platform for photocatalytic application, better than the benchmark acid treated ZnO/CF.
关键词： Carbon fabric,Photocatalytic activity,Nanostructure,Hydrothermal,Sputtering
更新于2025-09-23 15:21:21
-
Generating Silicon Nanofiber Clusters from Grinding Sludge by Millisecond Pulsed Laser Irradiation
摘要： Silicon nano?ber clusters were successfully generated by the irradiation of millisecond pulsed laser light on silicon sludge disposed from wafer back-grinding processes. It was found that the size, intensity, and growing speed of the laser-induced plume varied with the gas pressure, while the size and morphology of the nano?bers were dependent on the laser pulse duration. The generated nano?bers were mainly amorphous with crystalline nanoparticles on their tips. The crystallinity and oxidation degree of the nano?bers depended on the preheating conditions of the silicon sludge. This study demonstrated the possibility of changing silicon waste into functional nanomaterials, which are possibly useful for fabricating high-performance lithium-ion battery electrodes.
关键词： laser processing,sludge waste,silicon nano?ber,material reuse,nanostructure
更新于2025-09-23 15:21:01
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Structure Colors Realized by TiN-Si <sub/>3</sub> N <sub/>4</sub> -Si Nanostructure Array
摘要： In this paper, a nanostructure array is proposed to achieve a full-wavelength structural color in the visible range. The nanostructure is designed form of triangular prism which is composed of three layers of TiN, Si3N4 and Si materials. The cross section of the triangular prism is an isosceles triangle. By calculating the reflectance of such nanostructure array, it is found that the periodic variation has little effect on the scattering peak of the nanostructure array when we vary the cross-sectional area of the triangular prism and the period respectively. As the cross-sectional area of the triangular prism increases, the scattering peak shifts to red. According to our simulation, a variety of colors such as purple, green, cyan, orange, and red can be obtained. The proposed nanostructure array, which utilizes TiN as capping layer, can provide some new ways for realizing a sustainable structural color for various applications.
关键词： Periodic array,Structural color,Nanostructure
更新于2025-09-23 15:21:01
-
Multipoint Nanolaser Array in an Individual Core-Shell CdS Branched Nanostructure
摘要： Nanoscale laser arrays are attractive for their potential applications in highly integrated nanodevices, which are always obtained by nanowire arrays with complicated fabrication techniques. Here, a quite different nanolaser array is successfully realized based on a highly ordered core–shell CdS branched nanostructure with implanted Sn nanoparticles in junctions that split the individual multichannel nanostructures to various microcavities with effective light confinement and oscillation, thus to achieve a multipoint nanolaser array. Under the excitation of an ultraviolet laser, the strong band-edge emission can be well reflected between Sn nanoparticles at junctions and effectively scattered into branch segments due to Sn nanoparticles existence in junctions, furthermore oscillating in various microcavities along trunks or branches to form multipoint lasing from Fabry-Pérot (F-P) mode with a quality factor up to 990 and the low threshold at around 3.78 MW cm?2. The corresponding fluorescent microscope images further demonstrate the formation of multipoint F-P lasing at various segments. The theoretical simulation indicates that implanted Sn nanoparticles work as hot point to enhance the confinement of light around the Sn centers. The existence of surface plasmon from the Sn metal particles is further confirmed by the polarization dependent photoluminescence measurement. The results provide a new way to realize nanolaser arrays.
关键词： core–shell structures,CdS branched nanostructure,nanolaser arrays,electric field distribution
更新于2025-09-23 15:21:01