Large-scale synthesis of polyhedral Ag nanoparticles for printed electronics

Polani, Shlomi; Melamed, Semyon; Burlaka, Luba; Vega, Fernando de la; Zitoun, David

doi:10.1039/c7ra11370f

Cited by 12 publications

(9 citation statements)

References 29 publications

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“…64,65 Ag ions (salt) were converted to silver(I) oxide, whereas by significantly increasing the pH of the medium during the biosynthesis of silver nanoparticles, Ag + can be converted to silver(I) oxide due to NaOH (aq) used for the pH adjustment. The use of NaOH to produce a solid Ag 2 O phase was previously reported 66,67 that silver ions in the presence of OH ions form AgOH (aq), which quickly decompose when heated and precipitate to form the desired Ag 2 O, 68 as shown in the following chemical reaction eq 2. Conversely, the use of amino acids (phenylalanine and (2)…”

Section: Fourier Transform Infrared (Ftir) Spectroscopy Analysis Of T...mentioning

confidence: 99%

Biosynthesis of Silver Nanoparticles Functionalized with Histidine and Phenylalanine Amino Acids for Potential Antioxidant and Antibacterial Activities

et al. 2023

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Due to biochemically active secondary metabolites that assist in the reduction, stabilization, and capping of nanoparticles, plant-mediated nanoparticle synthesis is becoming more and more popular. This is because it allows for ecologically friendly, feasible, sustainable, and cost-effective green synthesis techniques. This study describes the biosynthesis of silver nanoparticles (AgNPs) functionalized with histidine and phenylalanine using the Lippia abyssinica (locally called koseret) plant leaf extract. The functionalization with amino acids was meant to enhance the biological activities of the AgNPs. The synthesized nanoparticles were characterized using UV–Visible absorption (UV–Vis), powder X-ray diffraction (pXRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy. The surface plasmonic resonance (SPR) peak at about 433 nm confirmed the biosynthesis of the AgNPs. FTIR spectra also revealed that the phytochemicals in the plant extract were responsible for the capping of the biogenically synthesized AgNPs. On the other hand, the TEM micrograph revealed that the morphology of AgNP-His had diameters ranging from 5 to 14 nm. The antibacterial activities of the synthesized nanoparticles against Gram-positive and Gram-negative bacteria showed a growth inhibition of 8.67 ± 1.25 and 11.00 ± 0.82 mm against Escherichia coli and Staphylococcus aureus, respectively, at a concentration of 62.5 μg/mL AgNP-His. Moreover, the nanoparticle has an antioxidant activity potential of 63.76 ± 1.25% at 250 μg/mL. The results showed that the green-synthesized AgNPs possess promising antioxidant and antibacterial activities with the potential for biological applications.

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Section: Fourier Transform Infrared (Ftir) Spectroscopy Analysis Of T...mentioning

confidence: 99%

Biosynthesis of Silver Nanoparticles Functionalized with Histidine and Phenylalanine Amino Acids for Potential Antioxidant and Antibacterial Activities

et al. 2023

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“…If more complex nanostructures are employed, even multipolar resonances can appear, as in the case of nanobars, or nanoshells [ 104 , 105 ]. In the past few years, a trend towards several polyhedral, disks, nanocrescent, and other complex nanostructures have been observed in the pursuit of higher RI sensitivities, and corresponding FOM [ 71 , 103 , 106 , 107 , 108 , 109 , 110 ]. The enhanced characteristics can be explained by the most elongated nanostructures, or the ones presenting sharper tips, generating hot spots.…”

Section: Nanostructuresmentioning

confidence: 99%

Advances in Plasmonic Sensing at the NIR—A Review

Santos

Almeida

Pastoriza‐Santos

et al. 2021

Sensors

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Surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) are among the most common and powerful label-free refractive index-based biosensing techniques available nowadays. Focusing on LSPR sensors, their performance is highly dependent on the size, shape, and nature of the nanomaterial employed. Indeed, the tailoring of those parameters allows the development of LSPR sensors with a tunable wavelength range between the ultra-violet (UV) and near infra-red (NIR). Furthermore, dealing with LSPR along optical fiber technology, with their low attenuation coefficients at NIR, allow for the possibility to create ultra-sensitive and long-range sensing networks to be deployed in a variety of both biological and chemical sensors. This work provides a detailed review of the key science underpinning such systems as well as recent progress in the development of several LSPR-based biosensors in the NIR wavelengths, including an overview of the LSPR phenomena along recent developments in the field of nanomaterials and nanostructure development towards NIR sensing. The review ends with a consideration of key advances in terms of nanostructure characteristics for LSPR sensing and prospects for future research and advances in this field.

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“…Looking forward, we expect to successfully deposit an electrode with this method in the following months, considering that the ink can be easily processed by inkjet printing as we have recently shown. 16 In conclusion, we measured the ORR of commercial Ag ink in an alkaline medium. To the best of our knowledge, such measurement was not reported previously.…”

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confidence: 93%

“…The nanoshell electrocatalysts were synthesized by first diluting a commercial silver ink consisting of Ag NPs with a well-defined particle size distribution (PSD), a mean size of 64 ± 20 nm in diameter and a polyhedral morphology as shown on the SEM image (Figure A) and previously reported by Polani et al The Ag NPs were used as a chemical sacrificial template in the synthesis of AgM (M = Pt or Pd) nanocrystals which exhibited hollow interiors as well as controlled surface composition. The synthesis was based on the GRR between metallic Ag and MCl 4 –2 (aq) . …”

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confidence: 99%

“…At this stage, printing a membrane electrode assembly would require considerable effort and time and such an endeavor is beyond the scope of a short communication. Looking forward, we expect to successfully deposit an electrode with this method in the following months, considering that the ink can be easily processed by inkjet printing as we have recently shown …”

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confidence: 99%

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Leveraging Commercial Silver Inks as Oxidation Reduction Reaction Catalysts in Alkaline Medium

Polani

Kanovsky

Zitoun

2018

ACS Appl. Nano Mater.

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Alkaline exchange membrane fuel cells (AEMFCs) development is impeded by the lack of low-cost processes for fabricating catalyst layers. One bottleneck lies in using large amounts of precious group metals during the layer deposition process by spray-painting. One possible solution would be to leverage inkjet printing technologies known for their full recovery of the printed material. Recent advances in printed electronics has led to the commercialization of silver (Ag) inks. We demonstrate the electrocatalytic properties (oxygen reduction reaction (ORR)) of Ag ink. Moreover, we show that a simple galvanic replacement reaction (GRR) on the Ag ink yields Ag 0.9 M 0.1 (M = Pt or Pd) hollow nanoparticles. The resultant electrocatalyst demonstrated high activity for the ORR in alkaline medium. The Ag colloidal dispersion (the ink) reacted with a minute amount of platinum group metals precursors (PGMs). X-ray diffraction (XRD) and electron microscopy confirmed the hollow morphology and the formation of Pt or Pd-rich surfaces. The onset voltage for alkaline ORR activities follows the trend Ag 0.9 Pt 0.1 > Ag 0.9 Pd 0.1 > Ag. These experiments are a first step toward inkjet printing usage for fabricating catalytic layers.

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Large-scale synthesis of polyhedral Ag nanoparticles for printed electronics

Abstract: The large-scale synthesis of polyhedral Ag nanoparticles (NPs) described here follows a mediated-particle mechanism and the formulation of NPs in high volume fraction ink easily forms highly electrically conductive lines for printed electronics.

Cited by 12 publications

References 29 publications

Biosynthesis of Silver Nanoparticles Functionalized with Histidine and Phenylalanine Amino Acids for Potential Antioxidant and Antibacterial Activities

Biosynthesis of Silver Nanoparticles Functionalized with Histidine and Phenylalanine Amino Acids for Potential Antioxidant and Antibacterial Activities

Advances in Plasmonic Sensing at the NIR—A Review

Leveraging Commercial Silver Inks as Oxidation Reduction Reaction Catalysts in Alkaline Medium

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