A novel and greener approach for shape controlled synthesis of gold and gold–silver core shell nanostructure and their application in optical coatings

Sinha, Tanur; Ahmaruzzaman, Md.

doi:10.1016/j.saa.2015.03.059

Cited by 16 publications

(16 citation statements)

References 34 publications

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“…Figure 5(d) describes the superimposed X‐ray elemental mapping picture (green spots describes‐Cu, red spots portrays–C and blue spots depicts S). It is evident from these figures that Cu NPs is formed and it is protected by biomolecules that contain groups such as C and S which was found to be in accordance with the EDX spectra [30] …”

Section: Resultssupporting

confidence: 72%

Sustainable Fabrication of Copper Nanoparticles: A Potent and Affordable Candidate for Water Treatment, Water Disinfection, Antioxidant Activity and Theranostic Agent

2022

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This study reports a simple, green, and large–scale biosynthetic fabrication of spherical copper nanoparticles (Cu NPs), approximate 28 nm, using the aqueous extracts of Diaplazium esulentum (Retz.) Sw. fern. Characterization was carried out for morphology, size, elemental analysis, crystallinity and for identification of functionalities responsible for reduction and stabilization. Extraordinary remediation efficiency was obtained for the developed Cu NPs for the elimination of two industrially important pollutants; Methyl Violet 6B and Methylene Blue (greater than 92 % within 150 mins). A mechanism was postulated for the process using the data on the identification of NPs and also spent NPs apart from degraded products. Furthermore, the Cu NPs revealed excellent antibacterial activity against gram positive bacteria: Staphylococcus aureus, Streptococcus pneumonia and Bacillus subtilis, as well as gram negative bacteria: Pseudomonas aeruginosa, Escherichia coli and potential action against fungal strains; Aspergillus niger and Candida albicans. Additionally, the assay depicted that Cu NPs has fairly decent radical scavenging activity with IC50 value 2.11 mM. Moreover, the Cu NPs were found to exhibit profound anticancerous activity against two human cancer line cells. The present research work has implications for exploitation of DE fern extract for the development of Cu NPs and their numerous applications ranging from pollutants removal to antibacterial, antifungal, antioxidant and anticancerous agents.

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Section: Resultssupporting

confidence: 72%

Sustainable Fabrication of Copper Nanoparticles: A Potent and Affordable Candidate for Water Treatment, Water Disinfection, Antioxidant Activity and Theranostic Agent

2022

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“…To the best of our knowledge, bio-synthesis of nanoscaled Co 3 O 4 was never reported so far. However, it was demonstrated that such an attractive greenapproach is successful in the synthesis of metallic nanoparticles as well as some limited oxides (14)(15)(16)(17)(18)(19).…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of Co₃O₄nanoparticles viaAspalathus linearis: Physical properties

Diallo

Beye

Doyle

et al. 2015

Green Chemistry Letters and Reviews

298

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This study reports on the bio-synthesis and the main physical properties of p-type Co 3 O 4 nanoparticles for the first time by a completely green chemistry process using Aspalathus linearis's natural extract as an effective chelating agent. Their surface/interface and optical properties are reported. In addition to the X-ray diffraction investigations, the Raman, and infrared as well as X-ray photoelectron spectroscopies confirmed the single phase of the Co 3 O 4 nanoparticles. As their average size can be as low as 〈fparticle〉 ∼3.6 nm, the reticular atomic plans are under a slight compressive state. ARTICLE HISTORY

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“…Some authors assume that for core@shell systems, the absorption spectra are composed of two bands associated with each of the metals for shell thicknesses between 3 and 4 nm. The absorption associated with metalcore disappears for higher thicknesses, obtaining a single absorption band where the maximum location depends on the thickness/core size ratio of the bimetallic particle [ 79 , 80 ].…”

Section: Resultsmentioning

confidence: 99%

Au@Ag Core@Shell Nanoparticles Synthesized with Rumex hymenosepalus as Antimicrobial Agent

et al. 2021

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In this work, we used a sequential method of synthesis for gold–silver bimetallic nanoparticles with core@shell structure (Au@AgNPs). Rumex hymenosepalus root extract (Rh), which presents high content in catechins and stilbenes, was used as reductor agent in nanoparticles synthesis. Size distribution obtained by Transmission Electron Microscopy (TEM) gives a mean diameter of 36 ± 11 nm for Au@AgNPs, 24 ± 4 nm for gold nanoparticles (AuNPs), and 13 ± 3 nm for silver nanoparticles (AgNPs). The geometrical shapes of NPs were principally quasi-spherical. The thickness of the silver shell over AuNPs is around 6 nm and covered by active biomolecules onto the surface. Nanoparticles characterization included high angle annular dark field images (HAADF) recorded with a scanning transmission electron microscope (STEM), Energy-Dispersive X-ray Spectroscopy (EDS), X-Ray Diffraction (XRD), UV–Vis Spectroscopy, Zeta Potential, and Dynamic Light Scattering (DLS). Fourier Transform Infrared Spectrometer (FTIR), and X-ray Photoelectron Spectroscopy (XPS) show that nanoparticles are stabilized by extract molecules. A growth kinetics study was performed using the Gompertz model for microorganisms exposed to nanomaterials. The results indicate that AgNPs and Au@AgNPs affect the lag phase and growth rate of Escherichia coli and Candida albicans in a dose-dependent manner, with a better response for Au@AgNPs

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A novel and greener approach for shape controlled synthesis of gold and gold–silver core shell nanostructure and their application in optical coatings

Cited by 16 publications

References 34 publications

Sustainable Fabrication of Copper Nanoparticles: A Potent and Affordable Candidate for Water Treatment, Water Disinfection, Antioxidant Activity and Theranostic Agent

Sustainable Fabrication of Copper Nanoparticles: A Potent and Affordable Candidate for Water Treatment, Water Disinfection, Antioxidant Activity and Theranostic Agent

Green synthesis of Co₃O₄nanoparticles viaAspalathus linearis: Physical properties

Au@Ag Core@Shell Nanoparticles Synthesized with Rumex hymenosepalus as Antimicrobial Agent

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A novel and greener approach for shape controlled synthesis of gold and gold–silver core shell nanostructure and their application in optical coatings

Cited by 16 publications

References 34 publications

Sustainable Fabrication of Copper Nanoparticles: A Potent and Affordable Candidate for Water Treatment, Water Disinfection, Antioxidant Activity and Theranostic Agent

Sustainable Fabrication of Copper Nanoparticles: A Potent and Affordable Candidate for Water Treatment, Water Disinfection, Antioxidant Activity and Theranostic Agent

Green synthesis of Co3O4nanoparticles viaAspalathus linearis: Physical properties

Au@Ag Core@Shell Nanoparticles Synthesized with Rumex hymenosepalus as Antimicrobial Agent

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Green synthesis of Co₃O₄nanoparticles viaAspalathus linearis: Physical properties