Stabilization of Au-Ag Nanoalloys with Polyvinylpyrrolidone (PVP) as Capping Agent

Hidayah, Affi Nur; Triyono, D.; Saputra, A B; Herbani, Yuliati; Isnaeni, Isnaeni; Suliyanti, Maria Margaretha

doi:10.1088/1742-6596/1191/1/012010

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…These Au−Ag NPs are only slightly larger than the 4−5 nm 32 and 5−7 nm 9 Au−Ag NPs synthesized in previous works using top-down LAL with polymer capping agents and similar in size to the 8 nm Au−Ag NPs synthesized using bottom-up photochemical reduction with polymer capping agents. 48 Moreover, our Au−Ag NPs are smaller than the 10−20 nm NPs synthesized using top-down LAL without any stabilizers. 31 We note that these small NP sizes do not arise from IPA acting as a surfactant because the FTIR spectra of Ag50 NPs synthesized with 0 and 20 mM IPA match each other and bear no resemblance to that of IPA (Supporting Information, Figure S5).…”

Section: Au−ag Alloy Characterizationmentioning

confidence: 83%

“…As can be seen in the inset, the SPR wavelength values (Supporting Information, Table S5) blue shift linearly with increasing Ag content in the precursor due to the combination of Au and Ag dielectric constants. The presence of a single SPR peak suggests the formation of Au−Ag alloys with either homogeneous composition 2,[17][18][19]48 or gradually varying composition from Au-rich core to Ag-rich shell. 52 TEM images and size distributions (Figure 7) show that the mean diameter of Au−Ag NPs, Ag25, Ag50, and Ag75, are 9.2 ± 3.0, 5.4 ± 3.1, and 8.0 ± 2.9 nm, respectively.…”

Section: Au−ag Alloy Characterizationmentioning

confidence: 99%

“…46 An understanding of the alloying mechanisms during Au−Ag NP synthesis by photochemical reduction with radical scavengers will thus be key to size control of ligand-free alloy NPs. Previous works have demonstrated the synthesis of Au−Ag NPs by laser reduction methods; 41,47−49 however, stabilizers are still used, 41,47,48 and hydroxyl radical chemistry has not been explicitly investigated. 49 The present work investigates the mechanisms of Au−Ag NP formation during femtosecond laser irradiation with the hydroxyl radical scavenger IPA.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of Gold–Silver Alloy Nanoparticle Formation by Laser Coreduction of Gold and Silver Ions in Solution

et al. 2021

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Photochemical reduction of aqueous Ag+ and [AuCl4]− into alloy Au–Ag nanoparticles (Au–Ag NPs) with intense laser pulses is a green synthesis approach that requires no toxic chemical reducing agents or stabilizers; however size control without capping agents still remains a challenge. Hydrated electrons produced in the laser plasma can reduce both [AuCl4]− and Ag+ to form NPs, but hydroxyl radicals (OH·) in the plasma inhibit Ag NP formation by promoting the back-oxidation of Ag0 into Ag+. In this work, femtosecond laser reduction is used to synthesize Au–Ag NPs with controlled compositions by adding the OH· scavenger isopropyl alcohol (IPA) to precursor solutions containing KAuCl4 and AgClO4. With sufficient IPA concentration, varying the precursor ratio enabled control over the Au–Ag NP composition and produced alloy NPs with average sizes less than 10 nm and homogeneous molar compositions of Au and Ag. By investigating the kinetics of Ag+ and [AuCl4]− coreduction, we find that the reduction of [AuCl4]− into Au–Ag NPs occurs before most of the Ag+ is incorporated, giving us insight into the mechanism of Au–Ag NP formation.

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Section: Au−ag Alloy Characterizationmentioning

confidence: 83%

Section: Au−ag Alloy Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanism of Gold–Silver Alloy Nanoparticle Formation by Laser Coreduction of Gold and Silver Ions in Solution

et al. 2021

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“…It acts as a capping agent through steric and electrostatic stabilization of amide groups of the pyrrolidone rings [ 30 , 31 ]. In this study, green synthesis of AgNPs was carried out using phytochemicals present in the aqueous extract of Eucalyptus camaldulensis leaves as reducing agent [ 32 ] and (PVP) has been used as a capping agent and stabilizer [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Polyvinylpyrrolidone Concentration on Properties and Anti-Bacterial Activity of Green Synthesized Silver Nanoparticles

et al. 2022

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Environmentally green synthesis of stable polyvinyl pyrrolidone (PVP)-capped silver nanoparticles (PVP-AgNPs) was successfully carried out. The present study focused on investigating the influence of adding PVP during the synthesis process on the size, optical properties and antibacterial effect of silver nanoparticles produced. An aqueous extract of Eucalyptus camaldulensis leaves was used as a reducing agent. The effects of different PVP concentrations and reducing time on the synthesis of nanoparticles (NPs) were characterized by UV–Vis spectrophotometry, scanning electron microscopy (SEM), energy dispersive spectrum (EDX), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS) and nano tracker analysis (NTA). The addition of PVP was studied. The prepared PVP-AgNPs were spherical with an average size of 13 nm. FTIR analysis confirmed that PVP protects AgNPs by a coordination bond between silver nanoparticles and both N and O of PVP. DLS results indicated the good dispersion of silver nanoparticles. PVP-AgNPs were found to be stable for nearly 5 months. Antibacterial studies through the agar well diffusion method confirmed that silver nanoparticles synthesized using PVP had no inhibitor activity toward Gram-positive and Gram-negative bacteria as opposed to silver nanoparticles prepared without adding PVP, which showed a significant antibacterial activity towards some of the tested pathogens.

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Structural, optical, and dielectric performance of PVA/PVP/PEG blend loaded with nano CoFe2−xErxO4 ferrite

El‐Naggar

Kamal

Abd‐Elkader

et al. 2023

J Mater Sci: Mater Electron

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Stabilization of Au-Ag Nanoalloys with Polyvinylpyrrolidone (PVP) as Capping Agent

Cited by 4 publications

References 15 publications

Mechanism of Gold–Silver Alloy Nanoparticle Formation by Laser Coreduction of Gold and Silver Ions in Solution

Mechanism of Gold–Silver Alloy Nanoparticle Formation by Laser Coreduction of Gold and Silver Ions in Solution

Influence of Polyvinylpyrrolidone Concentration on Properties and Anti-Bacterial Activity of Green Synthesized Silver Nanoparticles

Structural, optical, and dielectric performance of PVA/PVP/PEG blend loaded with nano CoFe2−xErxO4 ferrite

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