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- silver nanowires
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- Nanomaterials and Technology
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- South China University of Technology
- China Jiliang University
- Guangdong Poly-Optoelectronics Co.
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Diffractive dipolar coupling in non-Bravais plasmonic lattices
摘要： Honeycomb plasmonic lattices are paradigmatic examples of non-Bravais lattices. We experimentally measure surface lattice resonances in effectively free-standing honeycomb lattices composed of silver nanospheres. By combining numerical simulations with analytical methods, we analyze the dispersion relation and the near-field properties of these modes along high symmetry trajectories. We find that our results can be interpreted in terms of dipole-only interactions between the two non-equivalent triangular sublattices, which naturally lead to an asymmetric near-field distribution around the nanospheres. We generalize the interaction between the two sublattices to the case of variable adjacent interparticle distance within the unit cell, highlighting symmetry changes and diffraction degeneracy lifting associated to the transition between Bravais and non-Bravais lattices.
关键词： honeycomb plasmonic lattices,surface lattice resonances,non-Bravais lattices,diffraction degeneracy lifting,silver nanospheres,near-field properties,dipole-only interactions
更新于2025-09-19 17:13:59
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Reversible Wide‐Range Tuneable Luminescence of a Dual‐Stimuli‐ Responsive Silver Cluster‐Assembled Material
摘要： Silver cluster-assembled materials (SCAMs) are emerging multi-functional materials and have attracted great attention recently. In this work, we have prepared a new SCAM of {[Ag18(StBu)10(CF3COO)2(PhPO3)(PhPO3H)4(bpy-NH2)2]?(PhPO3H2)}n (denoted as Ag18bpy-NH2), by a facile one-pot method. Ag18bpy-NH2 adopts a chain-like structure made of Ag18 clusters bridged by bipyridyl linkers. Ag18bpy-NH2 exhibits reversible luminescent mechanochromism upon mechanical stimulation and solvent treatment. Moreover, it also displays luminescent thermochromism with a linear relationship of the temperature to the intensity ratio of the dual emissions over a wide temperature range of 83 to 303 K. This work might provide new insights into the assembly of multifunctional stimuli-responsive SCAMs.
关键词： luminescent mechanochromism,cluster-assembled material,silver cluster,luminescent thermochromism
更新于2025-09-19 17:13:59
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Evidence of Low Temperature Joints in Silver Nanowire Based Transparent Conducting Layers for Solar cells
摘要： The primary stage of joint formation of silver nanowires (AgNWs) at 60 °C is investigated using rotary scanning transmission electron microscopy (STEM with tomographic reconstruction images), and super large-scale molecular dynamic (MD) simulation (2×106 atoms). This study proves to establish that silver nanowires do not require the conventional high temperature post treatment process at 200 °C to form fused contacts at the intersections. In fact, a low temperature annealing at 60 °C facilitates formation of highly conductive networks. The connection between the nanowires is made through a stage called thinning, shown in this report for the first time, which occurs before broadening of the nanowires and is caused due to simultaneous effects of loads from the top nanowires and the heating, as confirmed by STEM and MD result. The outcomes of our investigation significantly promote the application of AgNWs as a transparent conductive layer for solar cells with requirement of low temperature processing such as Kasterite, Perovskite and Organic solar cells.
关键词： Low temperature process,Scanning transmission electron microscopy,Molecular dynamic simulation,Junction resistivity,Transparent conductive layer,Silver nanowire
更新于2025-09-19 17:13:59
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Dynamic casting in combination with ramped annealing process for implementation of inverted planar Ag3BiI6 rudorffite solar cells
摘要： The use of toxic Pb and insufficient long-term stability continue to limit the commercialization of organic–inorganic hybrid perovskite photovoltaics despite their excellent power conversion efficiencies (PCEs). Inorganic silver bismuth iodide is a strong candidate for a Pb-free and stable light harvester. Using a conventional n-i-p structure with high-temperature-processed TiO2 charge transport layer, PCEs of more than 4% have been achieved. However, development of inverted planar p-i-n architecture supporting low-temperature flexible application are still in its infant stage as the PCE of only 0.02% has been reported. To unravel such poor performance of the p-i-n structure, a Ag3BiI6 rudorffite film has been fabricated using a combination of dynamic casting (DC) and ramped annealing (RA). This technique significantly enhances the surface coverage of Ag3BiI6 on the underlying planar NiOx hole collector. Furthermore, the optimal annealing temperature of 180 °C allows for the formation of a highly polycrystalline and dense absorber. Based on this approach, the unprecedented PCE of 1.08% has been achieved, whereas the conventional method gives the PCE of only 0.07%. The DC/RA method could offer a new perspective for developing Pb-free inorganic rudorffite photovoltaics with an inverted planar architecture.
关键词： Ramped annealing,Inverted structure,Rudorffite,Silver bismuth iodide,Solar cells,Dynamic casting
更新于2025-09-19 17:13:59
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High Resolution Characterization of Plasmonic Hybridization in Silver Nanostructures
摘要： Surface plasmon resonances (SPR) in metallic nanostructures arise from the collective oscillation of conduction electrons, which create strong confined electric fields around the nanostructures. This confinement of electromagnetic (EM) energy at nanoscale dimensions holds potential towards the miniaturization of photonic devices [1]. Tremendous effort has been devoted towards optimization and design of nanostructures for several applications [2,3,4]. Most of these applications involve arrays of closely-spaced nanostructures: the plasmonic properties of the array differ from those of its isolated parts due to the interaction of evanescent fields. The study of SPR in these arrays, in particular the coupling of resonant modes, requires a characterization technique with both high spatial and energy resolution. Electron energy loss spectroscopy (EELS) meets these requirements, but has previously been limited to energies in the range of visible light or higher, mainly because of the relative intensities of the zero loss peak (ZLP) and low energy loss signal.
关键词： electron energy loss spectroscopy,metallic nanostructures,Surface plasmon resonances,hybridization,silver nanostructures
更新于2025-09-19 17:13:59
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Plasmon–Induced Dimerization of Thiazolidine-2, 4-Dione on Silver Nanoparticles - Revealed by Surface-Enhanced Raman Scattering Study
摘要： Surface-enhanced Raman scattering (SERS) study carried on thiazolidine-2, 4-dione (TZD), pharmacologically active heterocyclic compound, points to the presence of TZD dimer formed by plasmon-induced dimerization reaction of TZD on the surface of silver nanoparticles (Ag NP) at TZD concentrations of 10-3 M and above. The evidence for the presence of dimer was obtained from the appearance of a prominent band at 1566 cm-1 corresponding to ν C=C band (a characteristic vibrational band observed for the Knoevenagel condensation reaction products) which is absent in the normal Raman scattering (NRS) spectra of TZD solid/solution. The observed spectrum compares well with the calculated spectrum of dimer obtained using density functional theory (DFT) calculations. The dimerization reaction is plausibly induced by the transfer of hot electrons generated by the non-radiative plasmon decay of Ag NP and the proposed reaction mechanism is discussed. However, at lower concentrations (10-4 to 10-6M), the characteristic dimer peak (1566 cm-1) is absent and the SERS spectra resemble more with the NRS spectrum of TZD with few changes. The spectral analysis supported by DFT calculations showed that TZD molecules undergo deprotonation and get adsorbed on Ag NP surface as enolate forms. The proximity of TZD molecules on the surface of Ag NP is a necessary factor for the dimerization to occur. At lower concentrations, most molecules lie apart and reactions between molecules become less feasible and they remain as monomers on the surface, while at higher concentrations the molecules are closer to each other on Ag NP surface favouring the dimerization reaction to take place leading to the formation of the dimer.
关键词： density functional theory,thiazolidine-2, 4-dione,silver nanoparticles,plasmon-induced dimerization,Surface-enhanced Raman scattering
更新于2025-09-19 17:13:59
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Facile Fabrication of Highly Conductive, Ultra-Smooth and Flexible Silver Nanowire Electrode for Organic Optoelectronic Devices
摘要： So far, one of the fundamental limitations of silver nanowires is the high contact resistance among their junctions. Moreover, a rough surface due to its random arrangement is inevitable to electrical short when the nanowire-based electronics is driving. To improve the contact resistance, we suggest the particle-shape nanocrystals are intentionally reduced at the junctions by a localized Joule-heat reduction approach from the silver ions. Via localized reductions, the reduced nanoparticles effectively weld the junction’s areas resulting in a 19% decrease in sheet resistance to 9.9 ?sq-1. Besides, the nanowires are embedded into a polyamide film with a gentle hot pressing. Consequently, the roughness was considerably dropped so that it was successful to demonstrate OLEDs (organic light-emitting diodes) with nanowires, which was beneficial to be laminated with OLEDs under the low temperature. The experimental results show the Ag NW embedding films reach 10.9?sq-1 of the sheet resistance at 92% transmittance and the roughness was only 1.92nm.
关键词： embedding,transferring,joule-heat reduction,smooth surface,silver nanowire,transparent conductive electrode
更新于2025-09-19 17:13:59
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Wrinkled titanium nitride nanocomposite for robust bendable electrodes
摘要： Electrical contacts and interconnections are critical components for all electronic devices. Bendable electrodes with enhanced electro-mechanical properties are highly desirable to develop innovative wearable electronic devices. Herein we report on a fabrication method for robust bendable coatings based on titanium nitride (TiN) thin films and silver nanowires (Ag NWs). TiN and TiN-AgNWs nanocomposites were deposited on polyethylene terephthalate (PET) substrates using a plasma enhanced pulsed laser deposition (PLD) technique. The resulting TiN coatings exhibit excellent adhesion to PET and their sheet resistance can be tuned using a dual frequency PLD process and further decreased by incorporating Ag NWs into the TiN layers. Sample sheet resistance was decreased down to values as low as 3.5 Ω/□, thanks to the formation of TiN-AgNWs nanocomposites. The electro-mechanical robustness of TiN based coatings were evaluated by four-probe resistance measurements in situ under cyclic bending tests. We show that the TiN-AgNWs nanocomposites surpass both ITO and Ag NWs coatings in terms of mechanical robustness and electrical conductivity respectively. These nanocomposites withstand high strain fatigue loading up to ε = 2.6%, keeping RS below 5 Ω/□. The data demonstrates that the incorporation of Ag NWs in TiN coatings improve the mechanical robustness, limiting the crack growth and propagation, with low optical transmittance decrease (≈11%). These results indicate that Ag NWs based nanocomposites are attractive materials for flexible electronic devices.
关键词： mechanical strain,titanium nitride,nanocomposite,ITO,flexible electrode,silver nanowires
更新于2025-09-19 17:13:59
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Broadband Anti-Reflection in Black Silicon Fabricated by Two-Step Silver-Assisted Wet Chemical Etching for Photovoltaics
摘要： This paper reports broadband anti-reflection in black silicon (b-Si) fabricated by two-step metal-assisted chemical etching (MACE) for potential photovoltaic (PV) applications. The method involves deposition of silver nanoparticles (Ag NPs) in aqueous solution of HF:AgNO3, followed by etching in HF:H2O2:DI H2O solution for different duration (10-25 s). Effects of etching time towards surface morphological and optical properties of b-Si nanowires are investigated. Surface morphological characterization confirms presence of b-Si nanowires with heights of 350-570 nm and diameter of 150-300 nm. The b-Si nanowires exhibit outstanding broadband anti-reflection due to refractive index grading effect. This is represented as weighted average reflection (WAR) in the 300-1100 nm wavelength region. After 20 s of etching, b-Si nanowires with height of 570 nm and width of about 200 nm are produced. The nanowires demonstrate WAR of 5.5%, which represents the lowest WAR in this investigation. This results in absorption of 95.6% at wavelength of 600 nm. The enhanced broadband light absorption yields maximum potential short-circuit current density (Jsc(max)) of up to 39.7 mA/cm2, or 51% enhancement compared to c-Si reference. This facile b-Si fabrication method for broadband enhanced anti-reflection could be a promising technique to produce potential PV devices with high photocurrent.
关键词： black silicon,nanowires,silver-assisted etching,refractive index grading,anti-reflection
更新于2025-09-19 17:13:59
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Silver nanoparticles on graphene quantum dots as nanozyme for efficient H <sub/>2</sub> O <sub/>2</sub> reduction in a glucose biosensor
摘要： In this work, we developed graphene quantum dot-supported silver nanoparticles (AgNPs@GQDs) as Nanozyme for efficient electrocatalytic reduction of H2O2. We applied this composite material in a glucose oxidase-based glucose sensor, by drop casting a mixture of AgNPs@GQDs and chitosan (CS) on glassy carbon electrodes (GCE). Various conditions such as thickness of the AgNPs@GQDs/CS film, pH and temperatures were optimized. The proposed sensor presented excellent selectivity and sensitivity, a linear dependence on glucose concentration in the range 0.1–10 mM and a limit of detection of ca. 0.01 mM.
关键词： hydrogen peroxide reduction,electrochemical sensor,graphene quantum dots (GQDs),silver nanoparticles (AgNPs),glucose oxidase (GOx)
更新于2025-09-19 17:13:59