Green synthesis of reduced graphene oxide-AgAu bimetallic nanocomposite: Catalytic performance

Çıplak, Zafer; Getiren, Bengü; Gökalp, Ceren; Yıldız, Atilla; Yıldız, Nuray

doi:10.1080/00986445.2019.1613227

Cited by 33 publications

(10 citation statements)

References 44 publications

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“…Although gold and silver form an ideal solid solution in the bulk, AgAu nanoparticles’ synthesis by different preparation routes can produce profoundly different alloy nanoparticles. These typical synthesis routes include flame-spray pyrolysis, chemical vapor deposition, biological reduction, and the chemical reduction method of the most commonly used precursors HAuCl 4 and AgNO 3 . All synthesis routes based on the co-reduction of precursors suffer from several disadvantages, primarily the differences between reduction potentials of gold and silver, which leads to a faster reduction of the more noble gold before silver, leading to the formation of nanoparticles with a gold-rich core and silver-rich shell. , Another disadvantage is that stabilizing ligands or capping agents must be used in chemical synthesis to ensure constant particle sizes, blocking the active particle surface and obstructing the aptamer’s conjugation to the nanoparticle.…”

Section: Introductionmentioning

confidence: 99%

Influence of Gold/Silver Ratio in Ablative Nanoparticles on Their Interaction with Aptamers and Functionality of the Obtained Conjugates

et al. 2021

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Nano-bio-conjugates, featuring noble metal gold− silver alloy nanoparticles, represent a versatile tool in diagnostics and therapeutics due to their plasmonic and antimicrobial properties tunable by the particle's gold molar fraction. However, little is known about how the binding of thiolated biomolecules to noble metal nanoparticles is influenced by the fraction of gold and silver atoms on the nanoparticle's surface and to which extend this would affect the functionality of the conjugated biomolecules. In this work, we generated gold−silver alloy nanoparticles with average diameters of 7−8 nm using the modern, surfactant-free laser ablation in liquids (LAL) synthesis approach. We conjugated them with thiolated miniStrep aptamer ligands at well-controlled aptamer-to-nanoparticle surface area ratios with maxima between 12 and 27 pmol aptamer/cm 2 particle surface area. The results revealed a clear correlation between surface coverage and the nanoparticles' nominal gold/silver ratio, with maximum coverage reached for gold-rich alloys and a pronounced maximum for silverrich alloys. However, the conjugates' functionality, evaluated by binding of streptavidin, was surprisingly robust and hardly affected by the nominal composition. However, 1.5 times higher surface coverage was needed to obtain maximum functionality in the silverrich conjugates. Based on these results, it may be concluded that the nominal composition of gold−silver alloy nano-bioconjugates is freely tunable without a pronounced impact on the attached ligands' functionality, a finding highly relevant for the flexible design of nano-bio-conjugates for future biomedical applications. This study's results may facilitate the design of alloy nano-bio-conjugates for future applications in therapeutics and diagnostics.

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Section: Introductionmentioning

confidence: 99%

Influence of Gold/Silver Ratio in Ablative Nanoparticles on Their Interaction with Aptamers and Functionality of the Obtained Conjugates

et al. 2021

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“…Also, there is the possibility of the synergistic effect in bimetal catalysts. [115][116][117][118][119][120][121][122][123][124][125][126][127] In 2013, Bihua Xia et al 115 presented green-fabricated spherical Au/Ag bimetallic nanoparticles using degraded Pueraria mirica starch as both a reduction and stabilizing agent. Further, the authors tested the catalytic efficiency of the fabricated bimetallic Au/Ag nanoparticles towards the reduction of 4-nitrophenol.…”

Section: Bimetallic Nanoparticles As Catalystsmentioning

confidence: 99%

Reduction of 4-nitrophenol using green-fabricated metal nanoparticles

2022

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“…There are a few reports on Ag NPs preparation using lichens. − The basic experimental conditions and key results are summarized in Table .…”

Section: Introductionmentioning

confidence: 99%

“…Lichens like Xanthoria elegans and Cetraria islandica contain many metabolites that can be potentially used as both reduction and antimicrobial agents . Out of these four lichens, just C. islandica has been used for the green synthesis of Ag NPs until now. ,, …”

Section: Introductionmentioning

confidence: 99%

“…60 Out of these four lichens, just C. islandica has been used for the green synthesis of Ag NPs until now. 27,29,34 The aim of this work was to perform a rapid mechanochemical synthesis of Ag NPs with antibacterial activity. This approach offers an environmental benefit in comparison with the other approaches used for lichen-based NP syntheses until now and is thus in accordance with the protocol of sustainable synthesis.…”

Section: ■ Introductionmentioning

confidence: 99%

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Biomechanochemical Solid-State Synthesis of Silver Nanoparticles with Antibacterial Activity Using Lichens

Baláž

Goga

Hegedüs

et al. 2020

ACS Sustainable Chem. Eng.

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A completely solid-state mechanochemical synthesis of silver nanoparticles overcoming the problem with water insolubility of lichen metabolites hampering their use for the classical green synthesis in water is shown herein. Four lichen species (Xanthoria elegans, Cetraria islandica, Usnea antarctica, and Leptogium puberulum) and AgNO3 were used as reducing agents and Ag(0) precursor, respectively. The reaction progress was rapid in the first two cases, whereas in the case of U. antarctica and L. puberulum, a significant amount of AgNO3 could still be detected after 6 h of milling. The products with a higher content of Ag(0) were shown to undergo a backward transformation documented by increasing content of AgNO3 with storage time; however, the repeated formation of Ag(0) could be observed upon remilling. Transmission electron microscopy analysis has shown bimodal nanocrystallite size distribution in all cases. However, the finer fraction was more abundant in the case of silver nanoparticles prepared using lichens with stronger reducing ability (X. elegans and C. islandica). All the products are excellent antibacterial agents. Whereas the as-received products exhibited higher activity against E. coli, the remilled samples were more active against S. aureus.

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Green synthesis of reduced graphene oxide-AgAu bimetallic nanocomposite: Catalytic performance

Cited by 33 publications

References 44 publications

Influence of Gold/Silver Ratio in Ablative Nanoparticles on Their Interaction with Aptamers and Functionality of the Obtained Conjugates

Influence of Gold/Silver Ratio in Ablative Nanoparticles on Their Interaction with Aptamers and Functionality of the Obtained Conjugates

Reduction of 4-nitrophenol using green-fabricated metal nanoparticles

Biomechanochemical Solid-State Synthesis of Silver Nanoparticles with Antibacterial Activity Using Lichens

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