- 标题
- 摘要
- 关键词
- 实验方案
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The efficacy of plasmonic model to calculate HSFL nanostructure period in Sapphire
摘要： In this work, we try to determine all the period of nanostructure subwavelength that can be observed during irradiation by multipulse femtosecond laser in dielectric materials. For this, we use a generalized plasmonic model developed previously to follow the evolution of the periods of the nanostructures on the Sapphire material and their optical properties according to electron-holes plasma excitation and varying the optical spectrum between 300 and 1400 nm. We ?nd a nanostructure area where all the period observed experimentally must be included inside it. This plasmonic model shows its e?ciency and its precision on a nanoscale.
关键词： Sapphire,plasmonic model,HSFL nanostructure,femtosecond laser,electron-holes plasma
更新于2025-09-23 15:19:57
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Simple Route to Interconnected, Hierarchically Structured, Porous Zn2SnO4 Nanospheres as Electron Transport Layer for Efficient Perovskite Solar Cells
摘要： Constructing electron transport layer (ETL) with higher carrier mobility and suitable bandgap is of key importance as it greatly influences the photovoltaic performance of perovskite solar cells (PSCs). Zn2SnO4 (ZTO) carries a high electron mobility of 10–30 cm2 V-1 s-1, an order of magnitude over the widely used TiO2 ETL in perovskite solar cells (PSCs), rendering it an excellent alternative to TiO2 ETL. Herein, we report a simple yet robust polymer-templating route to interconnected, hierarchically structured, porous ZTO nanospheres as an efficient ETL for high-performance organolead halide PSCs. The porous ZTO nanospheres ETL, composed of an assembly of 4.5-nm ZTO nanoparticles on the surface of porous nanosphere possessing 80-100 nm cavity, renders markedly improved light absorption, enhanced electron extraction, facilitated charger transportation, and suppressed carrier recombination in the resulting PSCs, which exhibit a power conversion efficiency (PCE) of 17.14%, greatly outperforming the device based on the ZTO nanoparticles (14.02%; i.e., without porosity). As such, the strategy for crafting porous yet hierarchically structured semiconductors with high carrier mobility may open up an avenue to create robust ETL, and by extension, hole transport layer (HTL) for high-performance optoelectronics.
关键词： Zn2SnO4,perovskite solar cells,high electron mobility,hierarchical nanostructure,Electron transport layer
更新于2025-09-23 15:19:57
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Plasmonic Emission of Bullseye Nanoemitters on Bi2Te3 Nanoflakes
摘要： Topological insulators, such as Bi2Te3, have been con?rmed to exhibit plasmon radiation over the entire visible spectral range. Herein, we fabricate bullseye nanoemitters, consisting of a central disk and concentric gratings, on the Bi2Te3 nano?ake. Due to the existence of edge plasmon modes, Bi2Te3 bullseye nanostructures are possible to converge light towards the central disk. Taking advantage of the excellent spatial resolution of cathodoluminescence (CL) characterization, it has been observed that plasmonic behaviors depend on the excitation location. A stronger plasmonic intensity and a wider CL spectral linewidth can be obtained at the edge of the central disk. In order to further improve the focusing ability, a cylindrical Pt nanostructure has been deposited on the central disk. Additionally, the ?nite element simulation indicates that the electric-?eld enhancement originates from the coupling process between the plasmonic emission from the Bi2Te3 bullseye and the Pt nanostructure. Finally, we ?nd that enhancement e?ciency depends on the thickness of the Pt nanostructure.
关键词： bullseye nanostructure,Bi2Te3 nano?akes,plasmonic resonance,cathodoluminescence
更新于2025-09-23 15:19:57
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Metasurfaces: Subwavelength nanostructure arrays for ultrathin flat optics and photonics
摘要： Miniaturization is a strong demand of modern scientific technology. However, conventional optical components based on refraction suffer from functional degradation as the device size decreases. Metasurfaces consisting of subwavelength optical antenna arrays have emerged as planar optical devices that enable many promising applications in lenses, holograms, and optical cloaks. During recent decades, metasurfaces have been developed for their specific functionalities by exploiting new materials and design algorithms. In this issue of MRS Bulletin, progress in metasurfaces is discussed to provide a comprehensive understanding of metasurfaces and their novel applications in optics and photonics.
关键词： subwavelength nanostructure arrays,photonics,Metasurfaces,ultrathin flat optics
更新于2025-09-23 15:19:57
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Femtosecond laser fabrication of LIPSS-based waveplates on metallic surfaces
摘要： A fast and reliable method for the fabrication of polarization modifying devices using femtosecond laser is reported. A setup based on line focusing is used for the generation of LIPSS on stainless steel, processing at different speeds between 0.8 and 2.4 mm/s with constant energy per pulse of 1.4 mJ. SEM and AFM characterizations of the LIPSS show a progressive increase in period as the processing speed increases, while height remains approximately constant in the studied range. Optical characterization of the devices shows an induced change in the polarization of the reflected beam that varies with the processing speed, which allows a controlled fabrication of these devices.
关键词： polarization,waveplate,femtosecond,laser,LIPSS,nanostructure
更新于2025-09-23 15:19:57
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Plasmonic Electronsa??Driven Solara??toa??Hydrocarbon Conversion over Au NR@ZnO Corea??Shell Nanostructures
摘要： This work demonstrates the long-range redox reactivity of gold plasmon-generated hot electrons for solar-driven CO2 conversion. A series of Au NR@ZnO core-shell photocatalysts with a tunable shell thickness are rationally designed to achieve the solar-to-CH4 conversion, where the hot plasmonic electrons-induced photoreduction takes place on the polar oxide moiety. The shell thickness-independent activity implies that the core, gold nanorods, plays a dominant role in the CH4 generation. The ZnO metal oxide semiconductor shell is beneficial to prolong the lifetime of hot electrons, thereby enhancing the photocatalytic efficiency. However, the thickness of ZnO shell is not relevant to the production rate. Both of these two parts are co-excitated by solar light and synergetic enhance the photocatalytic activity.
关键词： gold nanorod,core-shell nanostructure,ZnO,photocatalysis,CO2 photoreduction,plasmon resonance
更新于2025-09-23 15:19:57
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Dual-photocathode array propelled lab-on-paper ratiometric photoelectrochemical sensing platform for ultrasensitive microRNA bioassay
摘要： In this work, a dual-photocathode array propelled lab-on-paper ratiometric photoelectrochemical (PEC) sensing platform integrated with DNA bridge nanostructure mediated electron-transfer tunneling distance regulation strategy was engineered for ultrasensitive assay of microRNA-141 (miRNA-141). Specifically, the spatial-resolved dual-photocathode array were comprised of a working electrode (PCE1) and internal reference electrode (PCE2), which were responsible for producing independent working signal (Iw) and internal reference signal (Ir). The dual-photocathode array was assembled with cascading multiple photosensitive structures enhanced rigidity remarkably increased the electron-transfer tunneling distance DNA probes from various concentrations of miRNA-141 induced duplex specific output DNA probes produced with a constant concentration of miRNA-141 were (NPs). With the proximity regulation of DNA hairpins H1 and H2, the amplified nanostructures on PCE1 and PCE2. Those formed DNA bridge nanostructures with consisting of pyramid-shaped Cu2O, graphene quantum dots, and AgI nanoparticles introduced onto PCE2, resulting in the formation of different amounts of DNA bridge photocurrent signals were obtained on PCE1 and PCE2. When target existed, the output nuclease-catalyzed target recycling reactions were introduced onto PCE1, while the Iw and constant Ir were ultimately collected. By monitoring the ratio of Iw and Ir, the different amounts of target-induced output DNA probes on PCE1 and PCE2, the variable between the sensing interface and AgI NPs immobilized on the terminals of H1 and H2, leading to noticeably decreased photocurrent signals. Based on the introduction of ultrasensitive bioassay of miRNA-141 was realized with high accuracy, selectivity, and practicability.
关键词： Pyramid-shaped Cu2O,Dual-photocathode array,DNA bridge nanostructure,Photoelectrochemical,Ratiometric
更新于2025-09-23 15:19:57
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Interfacing green synthesized flake like-ZnO onto TiO <sub/>2</sub> as a bilayer electron extraction for efficient perovskite solar cells
摘要： To improve the performance of the PSCs, it is essential to prevent the carrier recombination losses at the interfaces of the transparent metal oxide electrode/electron transport layer (ETL) / active absorber perovskite layer. This present work reports about the green synthesis approach used for the preparation of flake like-ZnO nanostructure (GF-ZnO NSs), naturally extracted from the leaf of Albizia Amara - as a reducing cum capping agent. Herein, we have introduced the above prepared an n-type GF-ZnO NSs material as efficient electron transport interfacial layer (bi-ETL) at the ETL/perovskite junction in the fabricated perovskite solar cells (PSCs). The structure of the fabricated PSC device as follow: Glass/ITO/bi-ETL (c-TiO2/GF-ZnO NSs)/CH3NH3PbI3-xClx/Spiro-MeOTAD/Au. A comparative study has also been made by deploying electron transport materials such as c-TiO2 and GF-ZnO NSs separately. From this, it has been found that the bi-ETL perovskite solar cell devices achieved a maximum power conversion efficiency (PCE) of 7.83% with open-circuit voltage (VOC) of 0.728 V, short circuit current density (JSC) of 20.46 mA/cm2 and a fill factor (FF) of 52.61% compared to that of the chemically reduced ZnO based devices. Whereas, the c-TiO2, GF-ZnO NSs and the chemically reduced CR-ZnO based ETL based devices achieved a PCE of 4.84%, 5.82% and 6.81% respectively. The obtained better performance of the bi-ETL based devices is ascribed to the enhanced carrier extraction and the reduced recombination losses at the interface between the ETL and the active perovskite layer.
关键词： bilayer electron extraction,green synthesis,Perovskite solar cells,Interfacial layer,ZnO nanostructure,Albizia Amara leaf extract
更新于2025-09-23 15:19:57
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Construction of Cr2O3:ZnO Nanostructured Thin Film Prepared by Pulsed Laser Deposition Technique for NO2 Gas Sensor
摘要： Rhombohedral structure of chromium oxide (Cr2O3) thin-film doped hexagonal zinc oxide (ZnO) nanoparticles have been prepared using pulsed laser deposition technique at a different weight percent of ZnO from 0 to 9 wt%. The results of X-ray diffraction analysis shown that the doped films are polycrystalline, and the average crystallite size of the synthesized thin films is found to be dependent on the ZnO concentration. The surface morphology of the prepared thin films was characterized by atomic force microscopy. The optical properties are investigated using ultraviolet–visible light (UV–Vis) absorption spectroscopy. The optical bandgap ranged from 2.45 to 2.68 eV, showing the shift towards longer-wavelength compared to bulk Cr2O3 (~ 3 eV). The sensitivity, response, and recovery times of the sensor towards nitrogen dioxide (NO2) gas were studied and discussed. The sensitivity increase with increasing the doping concentration, and started to decrease when ZnO concentrations reach 7 wt%. The optimal ZnO concentrations for NO2 gas sensitivity is 5 wt%, which attain maximum sensitivity of 87.5% at temperature of 523 K.
关键词： Cr2O3:ZnO nanostructure,Structural properties,Optical properties,Gas sensitivity,PLD technique
更新于2025-09-23 15:19:57
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Editorial: Special Issue a??Laser-Induced Periodic Surface Nano- and Microstructures for Tribological Applicationsa??
摘要： Laser material processing is an innovative technology that generates surface functionalities on the basis of optical, mechanical, or chemical properties. In the form of laser surface texturing (LST), it has attracted a remarkable amount of research to tailor surface properties towards various tribological applications. Of this single-step, laser-based technology, the main advantages are the contactless machining, featuring a high flexibility, efficiency, and speed, along with the excellent quality of the processed products. LST can be applied precisely, localized to sub-micrometric areas, but, via laser beam scanning, it is also feasible for structuring large surface areas the size of square-meters.
关键词： microstructure,wear,laser-induced periodic surface structures (LIPSS),lubricant,applications,friction,tribology,nanostructure
更新于2025-09-23 15:19:57