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Complementary Properties of Silver Nanoparticles on the Photovoltaic Performance of Titania Nanospheres Based Photoanode in Dye-Sensitized Solar Cells
摘要： In this study, the fabrication of photoanode of dye-sensitized solar cell using silver@titania nanospheres and N719 dye, and its enhanced photovoltaic performance in the dye-sensitized solar cell is described. Silver@titania with different mol. % of silver (1, 3 and 5 %) are synthesized using facile sol-gel and photochemical reduction method and are characterized by suitable analytical techniques. The synthesized nanocomposite materials showed nanospheres like morphology. Moreover, photoluminescence studies revealed that incorporation of silver nanoparticles on the titania nanospheres surface suppressed charge recombination process and which is more beneficial for dye-sensitized solar cells. Silver@titania nanospheres are successfully employed as a photoanode and demonstrated an enhanced solar-to-electrical energy conversion efficiency of 5.24 %, under full sun illumination (100 mW cm-2, AM 1.5 G) which is 30.67 % enhancement than that of bare titania nanospheres (4.01 %). This enhanced efficiency is attributed to the rapid interfacial charge transfer process and plasmonic effect offered by silver nanoparticles present in the silver@titania nanospheres. The improved charge transfer process led to minimize the back electron transfer reaction in the device. With complementary properties of silver nanoparticles, the high performance demonstrated by the silver@titania nanospheres could be an excellent candidate for the light energy harvesting applications.
关键词： Dye-sensitized solar cells,Plasmonic nanoparticles,Schottky barrier,Titania nanospheres,Silver nanoparticles
更新于2025-09-11 14:15:04
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Tailoring of Silver Nanoparticle Size Distributions in Hydrogenated Amorphous Diamond‐like Carbon Nanocomposite Thin Films by Direct Femtosecond Laser Interference Patterning
摘要： Tailoring of Silver Nanoparticle Size Distributions in Hydrogenated Amorphous Diamond-like Carbon Nanocomposite Thin Films by Direct Femtosecond Laser Interference Patterning
关键词： diamond-like carbon,direct laser interference patterning,silver nanoparticles,ablation threshold,nanocomposites
更新于2025-09-11 14:15:04
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Size controlled, time-efficient biosynthesis of silver nanoparticles from <i>Pleurotus florida</i> using ultra-violet, visible range, and microwave radiations
摘要： Monodisperse silver nanoparticles (AgNPs) were synthesized from cell free extracts of edible fungus Pleurotus florida by different electro-magnetic radiations, microwave, visible light and ultra-violet rays. The UV–vis spectroscopy of these nano-silver sols indicated the absorption maxima in 425–500 nm range. Synthesized nano-Ag sols had near spherical particles with nano-scale dimensions embedded in a matrix. Microwave irradiation led to synthesis of mono-disperse AgNPs of size (cid:1)10 nm within 150 s of exposure. However, visible light and ultra violet radiations led to synthesis of polydisperse AgNPs with inconsistent dimensions. The Fourier transform infrared spectroscopy of AgNPs elucidated the presence of molecules of fungal origin besides the vibrational peaks for Ag-O bond. The fungal proteins showed novel conformations upon capping the nanoparticles. The antibacterial activity of the AgNPs against gram positive and negative pathogens was assessed to determine their potential applications in silver-loaded antibacterial materials.
关键词： TEM,Pleurotus,green synthesis,Silver nanoparticles
更新于2025-09-11 14:15:04
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Laser Spark Spectrometry Study of the Properties of Cotton Fabric Modified with Silver Nanoparticles and the Strength and Duration of the Antiseptic Effect
摘要： A laser spark spectrometry study was carried out on the effect of the silver content in cotton fabric on the extent and duration of the antiseptic effect. Durable antiseptic properties of various strength were found to appear only after tannide fixation of the composition in the fabric structure.
关键词： laser spark spectrometry,tannide fixation,cotton fabric,silver nanoparticles,antiseptic effect
更新于2025-09-11 14:15:04
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Highly Luminescent Ternary Nanocomposite of Polyaniline, Silver Nanoparticles and Graphene Oxide Quantum Dots
摘要： Quantum dots (QDs) with photostability show a potential application in optical sensing and biological imaging. In this work, ternary nanocomposite (NC) of high fluorescent polyaniline (PANI)/2-acrylamido-2-methylpropanesulfonic acid (AMPSA) capped silver nanoparticles (NPs)/graphene oxide quantum dots (PANI/Ag (AMPSA)/GO QDs) have been synthesized by in situ chemical oxidative polymerization of aniline in the presence of Ag (AMpSA) nps and Go QDs. Ag (AMpSA) nps and Go QDs were prepared by AgNO3 chemical reduction and glucose carbonization methods, respectively. The prepared materials were characterized using UV-visible, Fourier transform infrared (FTIR), photoluminescence and Raman spectroscopies, X-Ray diffractometer (XRD) and high- resolution transmission electron microscopy (HRTEM). HRTEM micrographs confirmed the preparation of GO QDs with an average size of 15 nm and Ag (AMPSA) NPs with an average size of 20 nm. PANI/Ag (AMPSA)/GO QDs NC showed high and stable emission peak at 348 nm. This PANI/Ag (AMPSA)/GO QDs NC can emerge as a new class of fluorescence materials that could be suitable for practical sensing applications.
关键词： Fluorescent materials,Biological imaging,Quantum dots,Graphene oxide quantum dots,Polyaniline,Optical sensing,Polymeric nanocomposites,Silver nanoparticles
更新于2025-09-11 14:15:04
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The Extended Discrete Interaction Model: Plasmonic Excitations of Silver Nanoparticles
摘要： We present a new atomistic model for plasmonic excitations and optical properties of metallic nanoparticles which collectively describes their complete response in terms of fluctuating dipoles and charges that depend on the local environment and on the morphology of the composite nanoparticles. Being atomic dependent, the total optical properties, the complex polarizability and the plasmonic excitation of a cluster refer to the detailed composition and geometric characteristics of the cluster, making it possible to explore the role of material, alloy mixing, size, form shape, aspect ratios, and other geometric factors, down to the atomic level, and making it useful for the design of plasmonic particles with particular strength and field distribution. The model is parameterized from experimental data and at present practically implementable for particles up to more than 10 nanometers, for nanorods even more, thus covering a significant part of the gap between the scales where pure quantum calculations are possible and where pure classical models based on the bulk dielectric constant apply. We apply the method to both spherical and cubical clusters along with nanorods where we demonstrate both the size, shape and ratio dependence of plasmonic excitations and connect this to the geometry of the nanoparticles using the plasmon length.
关键词： Discrete Interaction Model,Optical Properties,Plasmonic Excitations,Plasmonics,Silver Nanoparticles
更新于2025-09-11 14:15:04
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A Plasmonic Approach to Study Protein Interaction Kinetics through the Dimerization of Functionalized Ag Nanoparticles
摘要： Understanding the kinetics of protein interactions plays a key role in biology with significant implications for the design of analytical methods for disease monitoring and diagnosis in medical care, research and industrial applications. Herein, we introduce a novel plasmonic approach to study the binding kinetics of protein-ligand interactions following the formation of silver nanoparticles (Ag nps) dimers by UV-Vis spectroscopy that can be used as probes for antigen detection and quantification. to illustrate and test the method, the kinetics of the prototype biotin-streptavidin (Biot-StV) pair interaction was studied. controlled aggregates (dimers) of StV functionalized Ag nps were produced by adding stoichiometric quantities of gliadin-specific biotinylated antibodies (IgG-Biot). The dimerization kinetics was studied in a systematic way as a function of Ag NPs size and at different concentrations of IgG-Biot. The kinetics data have shown to be consistent with a complex reaction mechanism in which only the Ag NPs attached to the IgG-Biot located in a specific STV site are able to form dimers. These results help in elucidating a complex reaction mechanism involved in the dimerization kinetics of functionalized Ag nps, which can serve as probes in surface plasmon resonance-based bioassays for the detection and quantification of different biomarkers or analytes of interest.
关键词： biotin-streptavidin interaction,silver nanoparticles,dimerization,protein interaction kinetics,plasmonic approach,surface plasmon resonance,UV-Vis spectroscopy
更新于2025-09-11 14:15:04
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Polydopamine-Assisted Fabrication of Stable Silver Nanoparticles on Optical Fiber for Enhanced Plasmonic Sensing
摘要： We present a facile and effective method for fabrication of the localized surface plasmon resonance (LSPR) optical fiber sensor assisted by two polydopamine (PDA) layers with enhanced plasmonic sensing performance. The first PDA layer was self-polymerized onto the bare optical fiber to provide the catechol groups for the reduction from Ag+ to Ago through chelating and redox activity. As the reduction of Ag+ proceeds, Ag nanoparticles (NPs) were grown in-situ on the PDA layer with uniform distribution. The second PDA layer was applied to prevent Ag NPs from oxidating and achieve an improvement of LSPR signal. The PDA/Ag/PDA-based optical fiber sensor has an enhanced LSPR sensitivity of 961 nm/RIU and excellent oxidation resistance. The stable PDA/Ag/PDA-based LSPR sensor with high optical performance is very promising for future application in optical sensing field.
关键词： silver nanoparticles,in-situ growth,optical fiber,LSPR,polydopamine
更新于2025-09-11 14:15:04
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Tuning of Citrate-stabilized Laser Ablated Silver Nanoparticles for Glyphosate Detection
摘要： The recent advances in nanotechnology can help develop both fast and cost-effective detection techniques to verify if the presence of contaminants in water resources is under safe limits, increasing temporal and geographical test coverage. For a specific analyte, the detection performance of citrate-stabilized silver nanoparticles depends on their chemical affinity, as well as on the ensemble characteristic of the colloid upon its de-stabilization by a mediated aggregation process. This work presents the tuning of citrate-stabilized silver nanoparticles produced by pulsed laser ablation in liquids for glyphosate detection in water. For fixed geometry and laser pulse characteristics, the ablation time, surfactant concentration and interaction pH were studied. The resulting colloidal solutions of silver nanoparticles with glyphosate were interrogated employing optical fiber spectroscopy. Two interrogation techniques which are based on a controlled aggregation of the colloid were used: UV-Vis extinction and Surface Enhanced Raman scattering. Using a calibration curve for low concentrations, the obtained limits of detection for glyphosate in water were 6 μM (1.0 mg/L) and 7.5 μM (1.3 mg/L), respectively.
关键词： SERS,silver nanoparticles,Glyphosate detection,laser ablation,LSPR
更新于2025-09-11 14:15:04
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Flower-like gold nanoparticles for enhanced photothermal anticancer therapy by the delivery of pooled siRNA to inhibit heat shock stress response
摘要： Reported reaction kinetics of metal nanoparticles in natural and engineered systems commonly have used proxy measurements to infer chemical transformations, but extension of these methods to complex media has proven difficult. Here, we compare the sulfidation rate of AgNPs using two ion selective electrode (ISE)-based methods, which rely on either (i) direct measurement of free sulfide, or (ii) monitor the free Ag+ available in solution over time in the presence of sulfide species. Most experiments were carried out in moderately hard reconstituted water at pH 7 containing fulvic acid or humic acid, which represented a broad set of known interferences in ISE. Distinct differences in the measured rates were observed between the two proxy-based methods and details of the divergent results are discussed. The two ISE based methods were then compared to direct monitoring of AgNP chemical conversion to Ag2S using synchrotron-based in situ X-ray diffraction (XRD). Using XRD, distinct rates from both ISE-based technique were observed, which demonstrated that ISE measurements alone are inadequate to discriminate both the rate and extent of AgNP sulfidation. XRD rate data elucidated previously unidentified reaction regimes that were associated with AgNP coating (PVP and citrate acid) and NOM components, which provided new mechanistic insight into metallic NP processing. In general, the extent of Ag2S formation was inversely proportional to surface coverage of the initial AgNP. Overall, methods to determine reaction kinetics of nanomaterials in increasingly complex media and heterogeneous size distributions to improve NP-based design and performance will require similar approaches.
关键词： ion selective electrode,X-ray diffraction,natural organic matter,silver nanoparticles,sulfidation kinetics
更新于2025-09-11 14:15:04