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- 2019
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- silver nanowires
- nanopaper
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- silver nanowire
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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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Excitation Transfer in Hybrid Nanostructures of Colloidal Ag2S/TGA Quantum Dots and Indocyanine Green J-Aggregates
摘要： The regularities of the electron excitations exchange in hybrid associates of colloidal Ag2S quantum dots, passivated with thioglycolic acid (Ag2S/TGA QDs) with an average size of 2.2 and 3.7 nm with Indocyanine Green J-aggregates (ICG) were studied in this work by methods of absorption and luminescence spectroscopy. It was shown that IR luminescence sensitization of Ag2S/TGA QDs with an average size of 3.7 nm in the region of 1040 nm is possible due to non-radiative resonance energy transfer from Ag2S/TGA QDs with an average size of 2.2 nm and luminescence peak at 900 nm using ICG J-aggregate as an exciton bridge. The sensitization efficiency is 0.33. This technique provides a transition from the first therapeutic window (NIR-I, 700-950 nm) to the second (NIR-II, 1000-1700 nm). It can allow high to increase the imaging in vivo resolution.
关键词： Non-radiative resonance energy transfer (FRET),Indocyanine green,Hybrid associate,Luminescence properties,Silver sulfide quantum dots,J-aggregates
更新于2025-09-23 15:21:01
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An investigation on determinants of silver paste metallization contact performance on crystalline silicon solar cells
摘要： Since the application of silver (Ag) electrodes is of vital importance to the power output of crystalline silicon (c-Si) solar cells, the factors affecting Ag paste metallization contact performance on Si wafers need to get well understood. Herein, the correlation of Ag/Si contact resistivity and glasses used in Ag paste was studied comprehensively. Here taken for exemplification are three types of glass samples used in Ag paste, because the application of them can result in obvious differences in the contact interface characteristics as well as in the contact resistivity. It was found that the factors affecting contact resistivity include the formation of Ag colloids in the glass phase, the doping concentration in the contacted Si surface, and the fixed charge density and defect states density at the interface. In terms of these issues, the key functions and mechanisms of glasses used in Ag paste are elucidated, and also their effects on electrical performance of cells are discussed in this article.
关键词： glass frit,metallization contact,contact resistivity,crystalline silicon solar cells,silver paste
更新于2025-09-23 15:21:01
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Novel strategy for fabrication of sensing layer on thiol-functionalized fiber-optic tapers and their application as SERS probes
摘要： This work presents a new strategy to fabricate optical fiber surface-enhanced Raman scattering (SERS) probes with high-performance remote sensing prepared by thiol functionalization of silica fiber taper, and further in situ nucleation and growth of silver nanoparticles (AgNPs). The prepared fiber probes can effectively identify the analyte 4-aminothiophenol (4-ATP) with a limit of detection (LOD) as low as 2.15×10-11 M using a portable commercial Raman spectrometer. Simultaneously, such fiber probes have shown a good reproducibility with the relative standard deviation (RSD) value of 7.6%, and possessed high signal stability at room temperature over one month. Furthermore, this approach provides new insight into the fabrication of fiber SERS probe integrated the advantages in terms of sensitivity, reproducibility and stability, which shows great potential for practical SERS applications.
关键词： Thiol functionalization,SERS performance,Probe,Silver nanoparticles,Optical fiber
更新于2025-09-23 15:21:01
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Fabrication of Ag nanoparticles adhered on RGO based on both electrodes in dye-sensitized solar cells (DSSCs)
摘要： The electrode plays an important role in dye-sensitized solar cells (DSSCs). Preparation of the electrode should be simple and should result in high performance of its DSSC. We herein demonstrated high-performance and easily prepared Silver nanoparticles adhered on Reduced graphene oxide–Platinum composites (Ag–RGO/Pt) as counter electrodes (CEs) and TiO2 on RGO sheets with Ag (TiO2–RGO/Ag) as photoanode (PE) in DSSCs. The 1:2 Ag–RGO/Pt CE and 0.5% TiO2–RGO/Ag PE showed an overall highest power conversion efficiency of 9.15% under (1.5 AM) solar irradiation. The optimal weight ratio of Ag:RGO:Pt materials was also examined. Moreover, we showed that incorporation of Ag nanoparticles into the counter electrode successfully improved interfacial charge transfer resulting in high electrocatalytic activity for the reduction of triiodide to iodide redox, which in turn could enhance the performance of the DSSCs.
关键词： Counter electrode,Silver,Reduced graphene oxide,Dye-sensitized solar cells
更新于2025-09-23 15:21:01
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Molecular-Level Control over Plasmonic Properties in Silver Nanoparticle/Self-Assembling Peptide Hybrids
摘要： The plasmonic properties of silver nanoparticle (AgNP) arrays are directly controlled by AgNP size, shape, and spatial arrangement. Reported here is a strategy to prepare chiral AgNP arrays templated by two constitutionally isomeric aromatic peptide amphiphiles (APAs), KS C′EKS and C′EKSKS (KS = S-aroylthiooxime-modi?ed lysine, C′ = citrulline, and E = glutamic acid). In phosphate bu?er, both APAs initially self-assembled into nanoribbons with a similar geometry. However, in the presence of silver ions and poly(sodium 4-styrenesulfonate) (PSSS), one of the nanoribbons (KS C′EKS) turned into nanohelices with a regular twisting pitch, while the other (C′EKSKS) remained as nanoribbons. Both were used as templates for synthesis of arrays of ～8 nm AgNPs to understand how small changes in molecular structure a?ect the plasmonic properties of these chiral AgNP/APA hybrids. Both hybrids showed improved colloidal stability compared to pure AgNPs, and both showed enhanced sensitivity as surface-enhanced Raman spectroscopy (SERS) substrates for model analytes, with nanohelices showing better SERS performance compared to their nanoribbon counterparts and pure AgNPs.
关键词： self-assembling peptide,silver nanoparticle,plasmonic properties,chiral AgNP arrays,SERS
更新于2025-09-23 15:21:01
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Synthesis of Sphere-Like Silver Nanostructures Composed of Self-Assembled Nanosheets
摘要： Sphere-like silver nanostructures composed of self-assembled nanosheets were rapidly synthesized through adding ferrous sulfate into the mixture of silver nitrate and citric acid aqueous solution by magnetic stirring at room temperature for 20 min. The effects of the concentrations of the ferrous sulfate and citric acid on the morphology of the silver nanostructures were investigated in detail. The characterization of the sphere-like silver nanostructures composed of self-assembled nanosheets have been discussed by scanning electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, and differential scanning calorimetry. Furthermore, the possible formation mechanism of sphere-like silver nanostructures composed of self-assembled nanosheets was explored. The experimental results show that the high concentration of citric acid and the low concentration of ferric sulfate are better for obtaining the sphere-like silver nanostructures composed of self-assembled nanosheets due to a low diffusion rate of silver atoms to the silver nucleus and a low growth rate of silver ?akes along the {111} facets. Such sphere-like silver nanostructures exhibit a strong surface-enhanced Raman scattering effect associated with their geometries, which is much stronger than that from nanosheets.
关键词： nanosheet,self-assembled,Sphere-like silver nanostructure,surface-enhanced Raman scattering effect
更新于2025-09-23 15:21:01
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Surface-plasmon-coupled chemiluminescence amplification of silver nanoparticles modified immunosensor for high-throughput ultrasensitive detection of multiple mycotoxins
摘要： A novel surface-plasmon-coupled chemiluminescent immunosensor was developed for the detection of multiplex mycotoxins with ultrahigh sensitivity, high throughput and simplicity. The immunosensor was constructed by immobilizing carboxyl modified silver nanoparticles (AgNPs) and bovine serum albumin combined antigens sequentially on the glass chip modified with amino groups. The optical properties of AgNPs could amplify the chemiluminescence (CL) generated on the chip through the surface plasmon resonance phenomenon. Using a competitive immunoassay, the CL signals from all the sensing sites on the chip were collected simultaneously by a charge-coupled device for ultrasensitive analysis of multiple mycotoxins. Citrinin, aflatoxin B1 and ochratoxins A were selected as model analytes. Under optimal conditions, the surface-plasmon-coupled chemiluminescent immunosensor-based method presented wide linear ranges over 4 orders of magnitude and much lower limits of detection than previous work. The assay results of mycotoxins in red yeast rice samples using the proposed method were in good agreement with that using the liquid chromatography-mass spectrometry method. Its high selectivity, high throughput, acceptable stability and accuracy showed broad prospects in mycotoxin monitoring and evaluation of safety on Traditional Chinese Medicine.
关键词： Immunosensor array,Signal amplification,Silver nanoparticle,Multiplex immunoassay,Mycotoxins,Surface-plasmon-coupled chemiluminescence
更新于2025-09-23 15:21:01
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Sensitive and selective detection of Cu2+ ions based on fluorescent Ag nanoparticles synthesized by R-phycoerythrin from marine algae Porphyra yezoensis
摘要： In this study, using a natural and green protein R-phycoerythrin (R-PE) extracted from marine Porphyra yezoensis as the stabilizer and reducer, silver nanoparticles (AgNPs) were synthesized. Based on this, a highly sensitive and selective method for the detection of Cu2+ ions was developed using R-PE-AgNPs as fluorescent probe. The interactions between R-PE-AgNPs and Cu2+ ions were systematically characterized by fluorescence spectroscopy, transmission electron microscopy (TEM), elemental mapping and Fourier transform infrared (FTIR). It was found that Cu2+ ions could cause aggregation of the R-PE-AgNPs, accompanied by the greatly increased particle size. Importantly, the method offered a wide linear detection range from 0 μM to 100.0 μM with a detection limit of 0.0190 μM. Moreover, the proposed method was successfully applied to analyze Cu2+ ions in tap water and lake water samples, acquiring satisfactory recovery between 91.6% and 102.2%. Such a green, fast and cost-effective fluorimetric method of the R-PE-AgNPs probe has great potential for tracing Cu2+ ions in diverse aqueous media.
关键词： Cu2+ detection,Silver nanoparticles,R-phycoerythrin,Water
更新于2025-09-23 15:21:01
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Insight into the compatibility between C4F7N and silver: Experiment and theory
摘要： Fluorinated nitrile (C4F7N) has received much attention as substitute gas for sulfur hexafluoride (SF6) using in electrical equipment over the past two years. In this paper, we explored the compatibility between C4F7N and silver theoretically and experimentally. The interaction mechanism between C4F7N and silver was investigated based on the density functional theory (DFT) and the composition characteristics of C4F7N and silver after long term interaction were also revealed. It was found that the most energetically favorable adsorption structure has the adsorption energy of 0.69 eV with 0.024e charge transfer. Electron localization function (ELF) also shows evidently electron delocalization region between C4F7N and Ag (1 1 1). Thus the interaction mechanism belongs to physisorption and the van der Waals force plays a major role. The gas composition of C4F7N, the morphology and crystal structure of silver did not have any obvious change after 70 days’ interaction, which indicates the compatibility between C4F7N and silver is great.
关键词： fluorinated nitrile,compatibility,SF6 alternative gas,silver
更新于2025-09-23 15:21:01
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A Predictive Model for the Electrical Transport Within Nanowire Networks
摘要： Thin networks of high aspect ratio conductive nanowires can combine high electrical conductivity with excellent optical transparency, which has led to a widespread use of nanowires in transparent electrodes, transistors, sensors, and ?exible and stretchable conductors. Although the material and application aspects of conductive nanowire ?lms have been thoroughly explored, there is still no model which can relate fundamental physical quantities, like wire resistance, contact resistance and nanowire density, to the sheet resistance of the ?lm. Here we derive an analytical model for the electrical conduction within nanowire networks based on an analysis of the parallel resistor network. The model captures the transport characteristics and ?ts a wide range of experimental data, allowing for the determination of physical parameters and performance limiting factors, in sharp contrast to the commonly employed percolation theory. The model thus constitutes a useful tool with predictive power for the evaluation and optimization of nanowire networks in various applications.
关键词： nanowires,electrical transport,model,percolation,carbon nanotubes,nanowire network,silver nanowires
更新于2025-09-23 15:21:01