Effect of irradiation time in the synthesis of Au-Ag nanoalloys by femtosecond laser

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

doi:10.1088/1742-6596/1245/1/012064

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…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 ,− , or gradually varying composition from Au-rich core to Ag-rich shell …”

Section: Resultsmentioning

confidence: 99%

“…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; ,− however, stabilizers are still used, ,, and hydroxyl radical chemistry has not been explicitly investigated . The present work investigates the mechanisms of Au–Ag NP formation during femtosecond laser irradiation with the hydroxyl radical scavenger IPA.…”

Section: Introductionmentioning

confidence: 97%

“…The present work investigates the mechanisms of Au–Ag NP formation during femtosecond laser irradiation with the hydroxyl radical scavenger IPA. Because effective size control of Au NPs synthesized via laser reduction is known to require solution pH in the range of pH 5–6, IPA was chosen instead of the commonly used scavenger NH 3 ,, because IPA does not produce highly basic solution pH. By studying the effect of IPA on Au and Ag salt reduction and the reaction kinetics during Au–Ag NP formation with added IPA, the alloying mechanisms of Au–Ag NPs under hydroxyl radical chemistry will be discussed.…”

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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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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“…TEM image also shows that morphologically homogeneous alloys are formed, as validated previously by their UV-Vis spectra which only has one LSPR peak rather than two peaks of those for core-shell nanoparticles. For the system of interest, the reduction process from metal salts into metal atoms by a femtosecond laser actually was finished in 5 minutes irradiation time [24]. When the laser irradiation time is prolonged to 10 minutes, there is laser melting phenomenon.…”

Section: Resultsmentioning

confidence: 99%

Optical and Electrical Properties of Gold-Silver Nanoalloys Synthesized through Photochemical Reduction using Femtosecond Laser

Hidayah

Herbani

2020

J. Pure App. Chem Res

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In this work we investigated the optical and electrical properties of Au-Ag nanoalloys in various volume ratios. The nanoparticles have been prepared from gold and silver ions reduced by direct irradiation femtosecond laser. The samples were added into a quartz cuvette and irradiated for 10 minutes. Each sample was observed the optical property where surface plasmon resonance (SPR) peak was existed. In addition, electrical conductivity of the colloids was derived from the measurement of the correspond zeta potential by dynamic light scattering (DLS) method. The results showed that the SPR peak of Au-Ag nanoalloy were shifted almost linearly in between 409 nm for Ag and 530 nm for Au depending on their volume fraction. The conductivity measurement showed that Au0Ag100 (pure Ag) nanoparticles has the highest value and Au100Ag0 (pure Au) nanoparticles has the lowest value, and interestingly, Au-Ag nanoalloys have the values between Au0Ag100 and Au100Ag0. Briefly, this work revealed that both optical and electrical properties of Au-Ag nanoalloys can be easily tuned by regulating the volume fraction between the two elements.

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“…where P is any property. 41 We are here particularly interested in examining if Vegard's law also holds true for the progression of the position of the SPR with mixing of the constituents as indicated in other studies 35,[42][43][44][45][46][47][48][48][49][50][51] for alloys and to some extent core shells or if this is geometry dependent as experiments on nano discs predict. 52 Since the polarizability or extinction cross section differs for Au and Ag it would also be of interest to see if the strength of the response to an external field also follow Vegard's law since the strength of the response determines strength of the local electric field from the SPR.…”

Section: Include All Properties Of Alloysmentioning

confidence: 94%

An atomistic description of alloys and core shells nanoparticles

Sørensen,

Utyushev,

Zakomirnyi

et al. 2020

Preprint

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Using the extended discrete interaction model we investigate the tuneabilty of surface plasmon resonance in alloys and core-shell nanoparticles made from silver and gold. We show that the surface plasmon resonance of these alloys and core-shell particles to a large extent follow Vegard's law irrespective of the geometry of the nanoparticle. We show the evolution of the polarizability with size and demonstrate the highly non-linear behaviour of the polarizability with the ratio of the constituents and geometry in alloys and core-shell nanoparticles, with the exception for nanorod alloys. A thorough statistical investigation reveals that there is only a small dependence of the surface plasmon resonance on atomic arrangement and exact distribution in a nanoparticle and that the standard deviation decrease rapidly with the size of the nanoparticles. The physical reasoning for the random distribution algorithm for alloys in discrete interaction models is explained in details and verified by the statistical analysis.

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Effect of irradiation time in the synthesis of Au-Ag nanoalloys by femtosecond laser

Cited by 9 publications

References 21 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

Optical and Electrical Properties of Gold-Silver Nanoalloys Synthesized through Photochemical Reduction using Femtosecond Laser

An atomistic description of alloys and core shells nanoparticles

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