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Ultrafine Cu2O/CuO nanosheet arrays integrated with NPC/BMG composite rod for photocatalytic degradation
摘要： A free-standing Cu2O/CuO@nanoporous copper/bulk metallic glass (Cu2O/CuO@NPC/BMG) composite rod with a multimodal hierarchical porous structure has been successfully prepared by a facile two-step synthesis strategy consisting of dealloying and anodizing. The NPC/BMG composite is first fabricated by dealloying of Cu50Zr45Al5 BMG rod. Then the ultrafine Cu2O/CuO nanosheet arrays are synthesized by anodizing of the NPC/BMG rod followed by heat treatment. The as-obtained Cu2O/CuO@NPC/BMG composite possesses a multimodal hierarchical porous structure comprising interconnected pores ranging from micro, meso to macro sizes. It is worth pointing out that there are several “barren lands” without nanosheets grown on the surface of the composite. Further analyses indicate that the microstructures of substrate materials not only dominate the sizes of Cu2O/CuO sheets, but also influence the nucleation and growth of Cu2O/CuO sheets. Meanwhile, the possible formation mechanism of the Cu2O/CuO nanosheets is proposed. Accordingly, the Cu2O/CuO@NPC/BMG composite shows remarkably high photocatalytic degradation performance and excellent cycling stability for RhB due to the multimodal hierarchical porous structure, ultrafine Cu2O/CuO nanosheets in the entire NPC and the integration design strategy.
关键词： Metallic glass,Dealloying,Nanoporous,Anodizing,Nanosheet
更新于2025-11-14 17:03:37
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Self-Patterned CsPbBr3 Nanocrystals for High-Performance Optoelectronics
摘要： All-inorganic lead halide perovskites are promising materials for many optoelectronic applications. However, two issues that arise during device fabrication hinder their practical use, namely inadequate continuity of coated inorganic perovskite films across large areas and inability to integrate these films with traditional photolithography due to poor adhesion to wafers. Herein, for the first time, to address these issues, we show a room-temperature synthesis process employed to produce CsPbBr3 perovskite nanocrystals with two-dimensional (2D) nanosheet features. Due to the unique properties of these 2D nanocrystals, including the 'self-assembly' characteristic, and 'double solvent evaporation inducing self-patterning' strategy are used to generate high-quality patterned thin films in selected areas automatically after-drop-casting, enabling fabrication of high-performance devices without using complex and expensive fabrication processing techniques. The films are free from micro-cracks. In a proof-of-concept experiment, photodetector arrays are used to demonstrate the superior properties of such films. We provide evidence of both high responsivity (9.04 A/W) and high stability across large areas. The photodetectors fabricated on flexible substrate exhibit outstanding photo-response stability. Advanced optical and structural studies reveal the possible mechanism. Our simple and cost-effective method paves the way for the next-generation nanotechnology based on high-performance, cost-effective optoelectronic devices.
关键词： photodetector,Self-assembly,self-patterning,two-dimensional nanosheet,perovskite
更新于2025-09-23 15:23:52
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Highly efficient solar steam generation via mass-produced carbon nanosheet frameworks
摘要： Carbon nanosheet frameworks are synthesized on the gram scale by exploiting the reaction between Mg powder and CS2 vapor. This fluffy carbon nanomaterial coated on fabric shows high performance in solar steam generation. The carbon film has high optical absorption of ~98% in visible and infrared spectrum. When under 1 sun solar-simulated light irradiance (1000 W m-2), the surface temperatures of dry and water-saturated carbon films reach 104 and 45 oC, respectively, indicating good heat localization. As a result, the carbon film under 1 sun illumination shows a high solar-to-vapor efficiency of 93%, which is higher than that of most photothermal conversion materials reported previously. The as-prepared carbon material may pave the way for harvesting solar energy to produce clean water at low cost.
关键词： solar steam generation,Mg thermoreduction,photothermal conversion,carbon nanosheet,vapor-solid reaction
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Austin, TX (2018.9.24-2018.9.26)] 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) - Rapid and Holistic Technology Evaluation for Exploratory DTCO in Beyond 7nm Technologies
摘要： New device architectures such as horizontal Nanosheets have been seriously considered as a replacement for FinFET. A comprehensive, and realistic assessment of these architectures at technology development is indispensable to understand their value propositions. In the early stages of this study a new holistic technology-evaluation methodology for an early technology assessment is proposed. This methodology closely links performance-power metrics to realistic area scaling using block area assessment. This is especially critical for lower track cells since routing complexity can severely degrade performance. In addition, the optimization of an M1 power staple design combined with this evaluation can provide 12% additional area reduction with less than 1% of inverter performance penalty.
关键词： Horizontal Nanosheet,DTCO,CMOS,Technology evaluation,Parasitic
更新于2025-09-23 15:22:29
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Facile Preparation of Unsubstituted Iron(II) Phthalocyanine/Carbon Nitride Nanocomposites: A Multipurpose Catalyst with Reciprocally Enhanced Photo/Electrocatalytic Activity
摘要： The development of new catalytic materials is conducive to solving the global energy crisis and environmental problems. In this work, multipurpose catalyst unsubstituted iron(II) phthalocyanine/carbon nitride nanosheet (FePc/CN) nanocomposites were prepared by utilizing concentrated sulfuric acid as an ideal solvent of CN and unsubstituted FePc. Such FePc/CN nanocomposites exhibited improved photo/electrocatalytic activity which was enhanced reciprocally: the photocatalytic activity of CN was promoted by FePc anchoring, and the electrocatalytic activity of FePc was improved by CN doping. The photocatalytic performance of FePc/CN?0.3 nanocomposites was about 6.4 and 1.7 times as high as FePc and CN, which was attributed to two reasons: (1) the anchoring FePc on CN extended the visible-light absorption region of CN, (2) the electron transfer from excited FePc to CN hindered charge carriers recombination and thus enhanced the photoinduced carrier separation efficiency. Relative to FePc and CN, the onset potential of FePc/CN?0.3 was positively shifted by 52 and 174 mV, such higher oxygen reduction reaction activity was due to the uniform dispersion of FePc on the supporting material CN without aggregation, which led to improved conductivity and stability of nanocomposites. This approach will contribute to an inexpensive and convenient synthetic strategy of transition-metal-based nanostructures for functional applications in photovoltaic, electrochemical, and catalytic fields.
关键词： Unsubstituted iron(II) phthalocyanine,Oxygen reduction reaction,Multipurpose catalyst,Photocatalytic performance,Carbon nitride nanosheet
更新于2025-09-23 15:22:29
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Simultaneously engineering K-doping and exfoliation into graphitic carbon nitride (g-C3N4) for enhanced photocatalytic hydrogen production
摘要： Doping and exfoliation are effective strategies to improve the photocatalytic activity of bulk graphitic carbon nitride (g-C3N4). Therefore, it can be inferred that engineering element-doping and exfoliation into g-C3N4 would further enhance the photocatalytic performance. Herein, we demonstrated a KOH-assisted hydrothermal-reformed melamine strategy for achieving the simultaneous K-doping and exfoliation of g-C3N4. The as-synthesized K-doped g-C3N4 ultrathin nanosheets displayed much enhanced photocatalytic hydrogen evolution rate (HER) of about 13.1 times higher than that of the bulk g-C3N4 under visible-light irradiation, achieving an apparent quantum efficiency of 6.98% at 420 nm. The improved photocatalytic HER can be attributed to the high surface area offering numerous photocatalytic active sites, enlarged conductive band edge optimizing photoreduction potential, and K-doping promoting charge generation and separation as well as the long life-time of photogenerated carriers. This work would provide a promising way to integrate co-doping and exfoliation into new g-C3N4-based materials.
关键词： Graphitic carbon nitride,Exfoliation,Photocatalytic hydrogen evolution,Nanosheet,K-doping
更新于2025-09-23 15:21:21
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TiOF2/TiO2 composite nanosheets: Effect of hydrothermal synthesis temperature on physicochemical properties and photocatalytic activity
摘要： TiOF 2 /TiO 2 nanosheets were prepared by hydrothermal processing of Ti(OBu) 4 in the presence of aqueous HF solution. The effect of different hydrothermal synthesis temperatures (140, 160, 180, and 200 °C) on the compositions, morphologies, crystal sizes, and photoelectric properties of the resulting samples was studied via various characterization methods. The photocatalytic properties of the samples were studied through photodegradation of organic pollutants such as rhodamine B (RhB), methyl orange (MO), and cipro?oxacin hydrochloride (CIP-HCl). TiOF 2 /TiO 2 nanosheets prepared by hydrothermal synthesis at 160 °C exhibited the highest photocatalytic activity among these samples, and it is much more active than P25 (a benchmark photocatalyst) and TiO 2 prepared hydrothermally (without adding aqueous HF solution during the hydrothermal synthesis). A possible photocatalytic mechanism is discussed.
关键词： Nanosheet,TiO 2,Photocatalyst,TiOF 2,Degradation
更新于2025-09-23 15:21:21
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Defect engineered mesoporous 2D graphitic carbon nitride nanosheet photocatalyst for Rhodamine B degradation under LED light illumination
摘要： In this work, a nitrogen vacancy induced 2D mesoporous graphitic carbon nitrogen (g-C3N4) nanosheet photocatalyst was successfully synthesized through a simple two step thermal treatment method. The morphology of the nanosheet photocatalyst and the presence of nitrogen vacancy was explored through a wide range of characterization techniques. The as prepared photocatalyst possess an improved visible light absorption efficiency as confirmed from the UV-Visible diffuse reflectance spectroscopy (DRS). Moreover, the improved charge carrier separation efficiency of the nitrogen vacant material was demonstrated from the photoluminescence spectrum. Most importantly, the photocatalyst exhibited an excellent photodegradation efficiency towards rhodamine B (RhB) dye under the illumination of an 18 W LED light. The vacancy induced nanosheets demonstrated a degradation co-efficient of 0.074 min-1 in RhB degradation, which is 9.25 fold higher than that of the bulk g-C3N4. The nanosheets further exhibited an enhanced degradation efficiency toward tetracycline antibiotic. Furthermore, the photocatalyst displayed an outstanding stability even after 5 cycles. A plausible photocatalytic mechanism has also been explained based on the results obtained from the radical scavenging experiments. This study would provide insight into the defect induction mechanism into the 2D g-C3N4 nanosheet and expected to help in rationally designing vacancy induced materials with cost effective application in various environmental fields.
关键词： nitrogen vacancy,LED light irradiation,rhodamine B,mesoporous,2D g-C3N4 nanosheet
更新于2025-09-23 15:21:01
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Photogating-controlled ZnO photodetector response for visible to near-infrared light
摘要： Over the last several decades, as a direct wide band gap semiconductor, zinc oxide (ZnO) nanomaterial has attracted lots of attention. However, the widely investigated ZnO materials are strongly limited in fast-response and broadband photodetectors due to their inherent weaknesses, so effective structure or mechanism of ZnO nanostructure photodetector is urgent. In this work, a photogating-controlled photodetector based on ZnO nanosheet-HfO2-lightly doped Si architecture was demonstrated. Its performance was improved significantly by the photogating-controlled local field at Si and HfO2 interfaces compared to other published work of ZnO. Consequently, the photodetector not only effectively balance the responsivity (as high as 5.6 A W-1) and response time (400 μs), but also broadens the response wavelength of the ZnO-based photodetectors from visible to near-infrared (~1200 nm). Additionally, the photogating-controlled ZnO photodetector enables high-resolution imaging both in visible and near-infrared bands. Our photogating-controlled ZnO photodetectors not only exemplify the control ability of the gate electrode in high mobility materials but also provide ideas for fast speed and high responsivity detection of high mobility materials.
关键词： ZnO nanosheet,photogating-controlled photodetectors,response wavelength,high-resolution imaging
更新于2025-09-23 15:21:01
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Grating on Plasmonic Nanosheet Structure for Multi-Stopband Filtering and Narrowband Emission
摘要： The narrowband emission at microscale regime is a crucial technology need in view of nanophotonic networks and lab-on-a-chip applications. Considering the significance of plasmonic nanosheet, this work proposes one such narrowband emitter in microscale regime. The proposed system is a dielectric grating on plasmonic nanosheet hybrid system. The numerical simulation results show that the proposed structure works as multi-stopband filter with band tenability as a function of refractive index of grating material. Furthermore, spectral smoothening is demonstrated due to the integration of dielectric grating to plasmonic nanosheet. Infiltration of the emitter in the grooves of the dielectric grating results in the narrowband-enhanced emission in UV region. The emission band proved to be tuned by carefully engineering the surface roughness, and can be engineered the same into broadband emitter. This new structure shows the way for realizing the on-chip spectrofluoremeter concept.
关键词： Emission engineering,Narrowband emitter,Stopband filter,Plasmonic nanosheet
更新于2025-09-23 15:21:01