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Dual-Wavelength Electrochemiluminescence Ratiometric Biosensor for NF-?oB p50 Detection with Dimethylthiodiaminoterephthalate Fluorophore and Self-Assembled DNA Tetrahedron Nanostructures Probe
摘要： Here, we have fabricated a dual-wavelength electrochemiluminescence ratiometric biosensor based on electrochemiluminescent resonance energy transfer (ECL-RET). In this biosensor, Au nanoparticle-loaded graphitic phase carbon nitride (Au-g-C3N4) as donor, and Au-modified dimethylthiodiaminoterephthalate (TAT) analogue (Au@TAT) as acceptor are investigated for the first time. Besides, tetrahedron DNA probe is immobilized onto Au-g-C3N4 to improve the binding efficiency of transcription factor and ECL ratiometric changes on the basis of the ratio of ECL intensity of 595 nm and 460 nm are obtained through the formation of sandwich structure of DNA probe-antigen-antibody. Our biosensor achieves the assay of NF-κB p50 with a detection limit of 5.8 pM as well as high stability and specificity.
关键词： NF-κB p50,Dimethylthiodiaminoterephthalate (TAT),DNA tetrahedron nanostructures,electrochemiluminescence,ratiometric biosensor
更新于2025-09-23 15:19:57
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Gap plasmons inducing strong plasmonic chirality in planar metallic nanostructures
摘要： In this paper, an observation of chiral gap plasmons that induce strong optical chirality, spectroscopic circular dichroism (CD), and near-field enhancement in a planar metallic nanostructure is reported. The resulting chiral nanostructure consists of artificial gold nanoscale elements which are periodically fabricated on a glass substrate. The measured extinctions of the structure under linearly polarized light illumination are in good agreement with numerical calculations of extinction cross-sections. The dissymmetry of the extinctions under left- and right-handed circular polarization is correlated to the far-field CD of the chiral nanostructure that yields a strong CD of up to 0.02. Near-field enhancement of up to 20 times and a large local optical chirality is numerically found at a plane 5 nm above the chiral nanostructure. The finding of chiral gap plasmons that induce strong optical chirality is experimentally demonstrated to enhance interaction between achiral dye molecule and chiral gap plasmon, emitting circularly polarized luminescence with a dissymmetry factor of up to 0.15.
关键词： optical chirality,chiral nanostructures,circularly polarized luminescence,circular dichroism,gap plasmon
更新于2025-09-23 15:19:57
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Advances in Silicona??Nanoelectronics, Nanostructures and Higha??Efficiency Sia??Photovoltaics
摘要： This Special Issue of physica status solidi (a) covers presentations of Symposium D, 2019 Spring-EMRS Meeting in Nice, France. Silicon in various bulk forms remains a fascinating material allowing for solar cell ef?ciency records by ultimate passivation of the bulk, surfaces, and contacts. In parallel, Si nanostructures emerge as capable building blocks in diverse ?elds ranging from nano-electronics and photonics to sensing. This symposium aimed to share the latest research in these ?elds and to create new interdisciplinary ideas.
关键词： High-Ef?ciency Si-Photovoltaics,Nanostructures,Silicon-Nanoelectronics
更新于2025-09-23 15:19:57
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Structural Colors Enabled by Lattice Resonance on Silicon Nitride Metasurfaces
摘要： Artificial color pixels based on dielectric Mie resonators are appealing for scientific research as well as practical design. Vivid colors are imperative for displays and imaging. Dielectric metasurface-based artificial pixels are promising candidates for developing flat, flexible, and/or wearable displays. Considering the application feasibility of artificial color pixels, wide color gamuts are crucial for contemporary display technology. To achieve a wide color gamut, ensuring the purity and efficiency of nanostructure resonance peaks in the visible spectrum is necessary for structural color design. Low-loss dielectric materials are suitable for achieving vivid colors with structural color pixels. However, high-order Mie resonances prevent color pixels based on dielectric metasurfaces from efficiently generating highly saturated colors. In particular, fundamental Mie resonances (electric/magnetic dipole) for red can result in not only a strong resonance peak at 650 nm, but also high-order Mie resonances at shorter wavelengths, which reduces the saturation of the target color. To address these problems, we fabricated silicon nitride metasurfaces on quartz substrates and applied Rayleigh anomalies at relatively short wavelengths to successfully suppress high-order Mie resonances, thus creating vivid color pixels. We performed numerical design, semianalytic considerations, and experimental proof-of-concept examinations to demonstrate the performance of the silicon nitride metasurfaces. Apart from traditional metasurface designs that involve transmission and reflection modes, we determined that lateral light incidence on silicon nitride metasurfaces can provide vivid colors through long-range dipole interactions; this can thus extend the applications of such surfaces to eyewear displays and guided-wave illumination techniques.
关键词： metasurfaces,Mie resonances,lattice resonances,color,silicon nitride,high-refractive-index nanostructures
更新于2025-09-23 15:19:57
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Light extraction from quantum dot light emitting diodes by multiscale nanostructures
摘要： Improving the light extraction efficiency by introducing optical–functional structures outside of quantum dot light emitting diodes (QLED) for further enhancing the external quantum efficiency (EQE) is essential for its application in display and lighting industrialization. Although the efficiency of QLED has been optimized by controlling of the synthesis of the quantum dots, the low outcoupling efficiency is indeed unresolved because of total internal reflections, waveguides and metal surface absorptions within the device. Here, we are utilizing multiscale nanostructures attaching to the outer surface of the glass substrate to extract the trapped light from the emitting layers of QLED. The result indicates that both the EQE and luminance are improved from 12.29% to 17.94% and 122400 cd m-2 to 178700 cd m-2, respectively. The maximum EQE and current efficiency improve to 21.3% and 88.3 cd A?1, respectively, which are the best performance among reported green QLED with light outcoupling nanostructures. The improved performance is ascribed to eliminate total internal reflection by multiscale nanostructures attached to the outer surface of the QLED. Additionally, the simulation result of Finite-difference time domain (FDTD) also demonstrates the light trapping effect is reduced by the multiscale nanostructures. The design of the novel light outcoupling nanostructure for further improving the efficiency of QLED can promote its application in display and lighting industrializations.
关键词： quantum dot light emitting diodes,multiscale nanostructures,light extraction efficiency,external quantum efficiency,display and lighting industrialization
更新于2025-09-23 15:19:57
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Photochemical Printing of Plasmonically Active Silver Nanostructures
摘要： In this paper, we demonstrate plasmonic substrates prepared on demand, using a straightforward technique, based on laser-induced photochemical reduction of silver compounds on a glass substrate. Importantly, the presented technique does not impose any restrictions regarding the shape and length of the metallic pattern. Plasmonic interactions have been probed using both Stokes and anti-Stokes types of emitters that served as photoluminescence probes. For both cases, we observed a pronounced increase of the photoluminescence intensity for emitters deposited on silver patterns. By studying the absorption and emission dynamics, we identified the mechanisms responsible for emission enhancement and the position of the plasmonic resonance.
关键词： silver deposition,silver islands film,silver nanostructures,metal enhanced luminescence
更新于2025-09-23 15:19:57
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Dynamic actuation of DNA-assembled plasmonic nanostructures in microfluidic cell-sized compartments
摘要： Molecular motor proteins form the basis of cellular dynamics. Recently, notable efforts have led to the creation of their DNA-based mimics, which can carry out complex nanoscale motion. However, such functional analogues have not yet been integrated or operated inside synthetic cells towards the goal of realizing artificial biological systems entirely from the bottom-up. In this Letter, we encapsulate and actuate DNA-assembled dynamic nanostructures inside cell-sized microfluidic compartments. These encapsulated DNA nanostructures not only exhibit structural reconfigurability owing to their pH-sensitive molecular switches upon external stimuli, but also possess optical feedback enabled by the integrated plasmonic probes. In particular, we demonstrate the power of microfluidic compartmentalization for achieving on-chip plasmonic enantiomer separation and substrate filtration. Our work exemplifies that the two unique tools, droplet-based microfluidics and DNA technology, offering high precision on the microscale and nanoscale, respectively, can be brought together to greatly enrich the complexity and diversity of functional synthetic systems.
关键词： plasmonic enantiomer selection,droplet-based microfluidics,DNA origami,plasmonic nanostructures,pH switch
更新于2025-09-23 15:19:57
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Self-Aligned Hierarchical ZnO Nanorod/NiO Nanosheet Arrays for High Photon Extraction Efficiency of GaN-Based Photonic Emitter
摘要： Advancements in nanotechnology have facilitated the increased use of ZnO nanostructures. In particular, hierarchical and core–shell nanostructures, providing a graded refractive index change, have recently been applied to enhance the photon extraction e?ciency of photonic emitters. In this study, we demonstrate self-aligned hierarchical ZnO nanorod (ZNR)/NiO nanosheet arrays on a conventional photonic emitter (C-emitter) with a wavelength of 430 nm. These hierarchical nanostructures were synthesized through a two-step hydrothermal process at low temperature, and their optical output power was approximately 17% higher than that of ZNR arrays on a C-emitter and two times higher than that of a C-emitter. These results are due to the graded index change in refractive index from the GaN layer inside the device toward the outside as well as decreases in the total internal re?ection and Fresnel re?ection of the photonic emitter.
关键词： ZnO nanorod/NiO nanosheet,photon extraction e?ciency,photonic emitter,self-align,hierarchical nanostructures
更新于2025-09-23 15:19:57
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Formation of Size and Density Controlled Nanostructures by Galvanic Displacement
摘要： Gold (Au) and copper (Cu)-based nanostructures are of great interest due to their applicability in various areas including catalysis, sensing and optoelectronics. Nanostructures synthesized by the galvanic displacement method often lead to non-uniform density and poor size distribution. Here, density and size-controlled synthesis of Au and Cu-based nanostructures was made possible by galvanic displacement with limited exposure to hydrofluoric (HF) acid and the use of surfactants like L-cysteine (L-Cys) and cetyltrimethylammonium bromide (CTAB). An approach involving cyclic exposure to HF acid regulated the nanostructure density. Further, the use of surfactants generated monodisperse nanoparticles in the initial stages of the deposition with increased density. The characterization of Au and Cu-based nanostructures was performed by scanning electron microscopy, atomic force microscopy, UV-Visible spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and X-ray diffraction. The surface enhanced Raman spectroscopic measurements demonstrated an increase in the Raman intensity by two to three orders of magnitude for analyte molecules like Rhodamine 6G dye and paraoxon.
关键词： monodisperse,sensing,surfactant,nanostructures,gold
更新于2025-09-23 15:19:57
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Nanoscaled Fractal Superstructures via Laser Patterninga??A Versatile Route to Metallic Hierarchical Porous Materials
摘要： A laser-based procedure for the preparation of metallic hierarchical porous materials is introduced and exemplified on tin, copper, silicon, titanium, and tungsten surfaces to demonstrate its general applicability. The impact of suitably tuned nanosecond laser pulses triggers a process in which laser-induced metal ablation and instantaneous recondensation of partially oxidized metals lead to cauliflower-like superstructures comprising a hybrid micro-/nanopatterning. Repeated scanning with the intense focused beam over the surface creates microstructures of hierarchically tunable porosity in a layer-by-layer design. The 3D morphology of these superstructures is analyzed using tomographic data based on focused ion-beam scanning electron microscopy to return a fractal dimension of Df = 2.79—practically identical to a natural cauliflower (Df ≈ 2.8), even though the plant is four orders of magnitude larger than the superstructures generated through the laser process. The high Df value signifies a complex morphology that boasts a huge external surface. The introduced concept enables convenient access to a variety of metallic hierarchical porous materials, which are key to performance in environmentally and technologically relevant areas like energy generation, storage, and conversion, as well as sensing and catalysis.
关键词： fractal morphology,cauliflower-like superstructures,porous nanostructures,self-organizing microstructures,scalable patterning
更新于2025-09-23 15:19:57