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[IEEE 2019 34th Symposium on Microelectronics Technology and Devices (SBMicro) - Sao Paulo, Brazil (2019.8.26-2019.8.30)] 2019 34th Symposium on Microelectronics Technology and Devices (SBMicro) - Influence of Silver nanoparticles on Tb <sup>3+</sup> doped TeO <sub/>2</sub> -ZnO glasses covered Silicon solar cell
摘要： This work shows the increase of silicon solar cell efficiency due to Tb3+ doped tellurite (TeO2-ZnO-Na2O-PbO) glass with silver nanoparticles used as cover layer. Due to Tb3+ down-conversion process optimized by the plasmon resonance of the metallic nanoparticles, enhancement of ~4.93% was observed when compared to the efficiency of the uncovered solar cell. The samples are prepared using the melting quenching techinique and the electrical characterization is performed using a solar simulator in order to obtain the current-voltage and power-voltage curve. As there is a mismatch between the solar spectrum and the one of the silicon solar cell, the procedure presented in this work represents an alternative to increase the number of photons that are converted from the ultraviolet region to the visible one and opens the posibility for application with new photovoltaic devices based on organic or inorganic materials.
关键词： tellurite,Silicon solar cells,Tb3+ ions,efficiency,silver nanoparticles
更新于2025-09-16 10:30:52
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In situ generated plasmonic silver nanoparticles sensitized amorphous titanium dioxide for ultrasensitive photoelectrochemical sensing of formaldehyde
摘要： Trace concentration of formaldehyde can damage human health and environment. Consequently, it is of great significance to develop an ultrasensitive sensor for its determination. Herein, an ingenious and efficient photoelectrochemical sensor for formaldehyde was constructed by amorphous TiO2 hollow spheres incorporated with Ag+ ions, which were brought about by silica templates etching and then the exchange of Ag+/Na+ ions. The amorphous TiO2 acted as the dual role of Ag+ ion probe carriers and photoelectric materials. Upon exposure to the increased concentration of formaldehyde, the Ag nanoparticles were produced in situ and photocurrent amplification was then achieved in a proportional manner. It is attributed to the injection of hot electrons from plasmonic Ag nanoparticles into the conduction band of amorphous titanium dioxide and enhanced the photocurrent therefore. The linear relationship between 1 and 400 pmol L-1 was resulted from the enhanced photocurrent and the increased concentration of formaldehyde, and the detection limit was 0.4 pmol L-1. Benefited from an in situ and unique sensitization strategy, this PEC sensor exhibited many advantages such as sensitivity, selectivity, cost-effectiveness, convenience of fabrication, low power consumption, and stability.
关键词： Plasmon,Formaldehyde,Silver nanoparticles,Sensing,Photoelectrochemical
更新于2025-09-16 10:30:52
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[IEEE 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Sao Paulo, Brazil (2019.10.7-2019.10.9)] 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Laser induced forward transfer of silver nanoparticles patterns
摘要： Laser-induced forward transfer (LIFT) with fs-pulses is used to produce silver nanoparticles patterns on glass substrates. LIFT is a versatile direct laser write technique in which a variety of materials can be transferred from a donor substrate to a receiver one. Here we present a study on the optimal parameters, such as scan speed and pulse energy, required to obtain a micrometric pattern on the transfer process. Spectroscopy analyses confirmed the composition and the formation of silver nanoparticles. Also, the electron localized microscopy deposition of silver nanoparticles, indicating such approach as a promising technique for the development of applications from electronics to photonics.
关键词： Femtosecond laser induced forward transfer,Micromachining,Silver nanoparticles
更新于2025-09-16 10:30:52
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Improved organic solar cell by incorporating silver nanoparticles embedded polyaniline as buffer layer
摘要： The role of silver nanoparticles (AgNP) in polyaniline (PANI) as a buffer layer for ITO/AgNP-PANI/PANI/Al solar cell was investigated. It is observed that AgNP-PANI buffer layer significantly improves the electrical parameters such as diode-ideality factor, series-resistance, energy-barrier height, and shunt-resistance as a growing function of AgNP concentration. On-the-other hand oppose to the dark current-voltage response, 0.5% concentration of AgNP in buffer layer shows the most optimum photovoltaic response and cause to increase the power conversion efficiency (PCE) nearly 5 times compared to same solar cell without buffer layer. Such improvements in electrical parameters can be interpreted as the reduction in interfacial trap states as well as enhancement in interfacial dipole-moment by AgNP embedded buffer layer for given photovoltaic device. While, the observed optimum photovoltaic behavior at 0.5% AgNP concentration is may be due to the trade-offs between gains and losses for optical absorption enhancement, self-absorption heating and interface recombination losses respectively. It is also observed that the AgNP embedded PANI buffer layer approach is an effective solution to lower the photovoltaic degradation and hence improves the stability of the photovoltaic devices.
关键词： ITO,Silver nanoparticles,Solar cell,Organic semiconductor,Organic electronics,Polyaniline,Buffer layer
更新于2025-09-12 10:27:22
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Thermal and laser sintering of a highly stable inkjet ink consisting of silver nanoparticles stabilized by a combination of a short chain carboxylic acid and a polymeric dispersant
摘要： A mixture of silver nanoparicles and its organic salt has been used for the development of conductive inks for inkjet printing. Silver nanoparticles stabilized with butanoic acid (C4) with the average size of 11.1±2.4 nm have been synthesized via the reduction of solid silver carboxylate with hydrazine hydrate in benzyl alcohol. An inkjet ink formulation consisting of the silver nanoparticles capped with butanoic acid (up to 50 wt.%) with the addition of polymeric BYK dispersant in a mixture of nontoxic solvents with different boiling temperatures and different polarities has been developed and its physical properties and stability have been studied. Silver layers were spin coated and printed on a polyimide film using the developed ink. Experiments on the thermal annealing of the silver films showed that the curing temperature can be below 200 oC to obtain a layer having the electrical resistivity less than 10 μ?×cm. A study of the laser sintering of the printed and spin coated elements on a polyimide film using a diode laser operating at 453 nm in impulse mode showed that the best mode is a multi-pass sintering, which can be divided into two steps: the evaporation of the solvent and sintering of the silver nanoparticles.
关键词： silver nanoparticles,selective laser sintering,conductive ink,chemical synthesis,printed electronics
更新于2025-09-12 10:27:22
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Silver Nanoparticles Enhanced Luminescence and Stability of CsPbBr <sub/>3</sub> Perovskite Quantum Dots in Borosilicate Glass
摘要： Series of silver nanoparticles (NPs) embedded CsPbBr3 quantum dots (QDs) glass was synthesized via the melt-quench method. Ag NPs and CsPbBr3 QDs coexist in the TEM image of the Ag-doped glass sample. Photoluminescence (PL) spectra show that the 0.1 molar ratio Ag2O doped sample had a PL intensity 2.37 times than the undoped sample. This increase is generated by localized surface plasmon resonance coupling between the Ag NPs and CsPbBr3 QDs. Excessive Ag doping weakens the PL intensity due to spectral self-absorption of the Ag NP surface plasmon resonance (SPR). Self-adsorption of SPR is detrimental to luminescence properties because it increases the amount of photogenerated charge carriers which proceed through non-radiative relaxation pathways. In addition, stability results of Ag NP doped-CsPbBr3 QD glass show that they have excellent stability. This study on Ag NP doped-CsPbBr3 QD glass provides a new idea for the future development of perovskite QD optoelectronic devices.
关键词： Borosilicate glass,CsPbBr3 perovskite quantum dots,Luminescence,Stability,Silver nanoparticles
更新于2025-09-12 10:27:22
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Bifunctionalized Silver Nanoparticles as Hg2+ Plasmonic Sensor in Water: Synthesis, Characterizations, and Ecosafety
摘要： In this work, hydrophilic silver nanoparticles (AgNPs), bifunctionalized with citrate (Cit) and L-cysteine (L-cys), were synthesized. The typical local surface plasmon resonance (LSPR) at λ max = 400 nm together with Dynamic Light Scattering (DLS) measurements (<2RH = 8 ± 1 nm) and TEM studies (? = 5 ± 2 nm) confirmed the system nanodimension and the stability in water. Molecular and electronic structures of AgNPs were investigated by FTIR, SR-XPS, and NEXAFS techniques. We tested the system as plasmonic sensor in water with 16 different metal ions, finding sensitivity to Hg2+ in the range 1–10 ppm. After this first screening, the molecular and electronic structure of the AgNPs-Hg2+ conjugated system was deeply investigated by SR-XPS. Moreover, in view of AgNPs application as sensors in real water systems, environmental safety assessment (ecosafety) was performed by using standardized ecotoxicity bioassay as algal growth inhibition tests (OECD 201, ISO 10253:2006), coupled with determination of Ag+ release from the nanoparticles in fresh and marine aqueous exposure media, by means of ICP-MS. These latest studies confirmed low toxicity and low Ag+ release. Therefore, these ecosafe AgNPs demonstrate a great potential in selective detection of environmental Hg2+, which may attract a great interest for several biological research fields.
关键词： silver nanoparticles,heavy metal sensing,Hg2+ sensors,optical sensors,ecosafety,plasmonic sensors
更新于2025-09-12 10:27:22
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Fabrication of Interconnected Plasmonic Spherical Silver Nanoparticles with Enhanced Localized Surface Plasmon Resonance (LSPR) Peaks Using Quince Leaf Extract Solution
摘要： Interconnected spherical metallic silver nanoparticles (Ag NPs) were synthesized in the current study using a green chemistry method. The reduction of silver ions to Ag NPs was carried out with low-cost and eco-friendly quince leaves. For the first time, it was confirmed that the extract solution of quince leaves could be used to perform green production of Ag NPs. Fourier transform infrared spectroscopy (FTIR) was conducted to identify the potential biomolecules that were involved in the Ag NPs. The results depicted that the biosynthesis of Ag NPs through the extract solution of quince leaf was a low-cost, clean, and safe method, which did not make use of any contaminated element and hence, had no undesirable effects. The majority of the peaks in the FTIR spectrum of quince leaf extracts also emerged in the FTIR spectrum of Ag NPs but they were found to be of less severe intensity. The silver ion reduction was elaborated in detail on the basis of the FTIR outcomes. In addition, through X-ray diffraction (XRD) analysis, the Ag NPs were also confirmed to be crystalline in type, owing to the appearance of distinct peaks related to the Ag NPs. The creation of Ag NPs was furthermore confirmed by using absorption spectrum, in which a localized surface plasmon resonance (LSPR) peak at 480 nm was observed. The LSPR peak achieved in the present work was found to be of great interest compared to those reported in literature. Field emission scanning electron microscopy (FESEM) images were used to provide the morphology and grain size of Ag NPs. It was shown from the FESEM images that the Ag NPs had interconnected spherical morphology.
关键词： FESEM study,FTIR study,XRD analysis,UV–Vis absorption,quince leave,silver nanoparticles
更新于2025-09-12 10:27:22
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Multiple Scattering from Electrospun Nanofibers with Embedded Silver Nanoparticles of Tunable Shape for Random Lasers and White-Light-Emitting Diodes
摘要： Random lasers (RLs) are convenient, tunable, and widely applicable. However, the influence of fluorescence lifetime on the scattering and nanofiber distribution of nanofibers with various shapes of silver nanoparticles (Ag NPs) embedded within is unclear. We prepared polyvinyl alcohol (PVA) nanofibers with Ag NPs through electrospinning (ES) and pyrromethene 597 dye doping. We determined the influences of the particles on scattering enhancement and localized surface plasmon resonance (LSPR) in RLs. The distinct scattering rates and LSPR can be used to control optical properties for sensing devices and other applications. Compared with traditional films, the threshold of the nanofibers with Ag NPs is 35% lower. In addition to improved matching between the LSPR and emission spectra, enhanced coupling of the electric field with nonradiative energy amplifies the radiative emission. Furthermore, the luminescence lifetime shortened by increasing the scattering rate. An excessive scattering rate may accelerate radiative recombination and convert some recombination into nonradiative recombination to produce a more sensitive device. Finally, we applied the prepared nanofibers to a backlight display and fabricated a white-light-emitting diode (LED) with a distinct thickness of nanofibers. The fabricated device is suitable for application in other LEDs and RL devices.
关键词： light scattering,silver nanoparticles,plasmonic,electrospun fibers,random lasers
更新于2025-09-12 10:27:22
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Orientation-Controlled Bioconjugation of Antibodies to Silver Nanoparticles
摘要： Here we report on the use of heterobifunctional cross-linkers (HBCLs) to control the number, orientation, and activity of immunoglobulin G antibodies (Abs) conjugated to silver nanoparticles (AgNPs). A hydrazone conjugation method resulted in exclusive modification of the polysaccharide chains present on the fragment crystallizable region of the Abs, leaving the antigen-binding regions accessible. Two HBCLs, each having a hydrazide terminal group, were synthesized and tested for effectiveness. The two HBCLs differed in two respects, however: (1) either a thiol or a dithiolane group was used for attachment to the AgNP; and (2) the spacer arm was either a PEG chain or an alkyl chain. Both cross-linkers immobilized 5 ± 1 Abs on the surface of each 20-nm-diameter AgNP. Electrochemical results, obtained using a half-metalloimmunoassay, proved that Abs conjugated to AgNPs via either of the two HBCLs were 4 times more active than those conjugated by the more common physisorption technique. This finding confirmed that the HBCLs exerted orientational control over the Abs. We also demonstrated that the AgNP-HBCL-Ab conjugates were stable and active for at least 2 weeks. Finally, we found that the stability of the HBCLs themselves was related to the nature of their spacer arms. Specifically, the results showed that the HBCL having the alkyl chain is chemically stable for at least 90 days, making it the preferred cross-linker for bioassays.
关键词： alkyl chain,antigen-binding regions,heterobifunctional cross-linkers,PEG chain,hydrazone conjugation,physisorption technique,immunoglobulin G antibodies,silver nanoparticles,half-metalloimmunoassay,fragment crystallizable region
更新于2025-09-12 10:27:22