Synthesis and characterization of Au–Fe alloy nanoparticles embedded in a silica matrix by atom beam sputtering

Pannu, Compesh; Bala, Manju; Khan, Saif; Srivastava, Suneel Kumar; Kabiraj, D.; Avasthi, D.K.

doi:10.1039/c5ra19136j

Cited by 16 publications

(3 citation statements)

References 44 publications

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“…Sputtering is a procedure in which nanoparticles are created by bombarding the target metal with high energy [ 1 ]. Atom beam sputtering involves three basic steps: migration of atoms from the surface of materials, nucleation and growth of nanoparticles, and absorption onto another material in an electric field [ 22 , 23 , 24 ]. Magnetron sputtering involves sputtering in a magnetic field, in which one or more materials are deposited on the surface of another material such as metal or ceramics through a high-rate vacuum coating technique [ 25 , 26 , 27 , 28 , 29 ].…”

Section: Methods Of Synthesizing Alloy Nanoparticlesmentioning

confidence: 99%

Synthesis, Properties, and Biological Applications of Metallic Alloy Nanoparticles

Huynh

Pham

Kim

et al. 2020

IJMS

146

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Metallic alloy nanoparticles are synthesized by combining two or more different metals. Bimetallic or trimetallic nanoparticles are considered more effective than monometallic nanoparticles because of their synergistic characteristics. In this review, we outline the structure, synthesis method, properties, and biological applications of metallic alloy nanoparticles based on their plasmonic, catalytic, and magnetic characteristics.

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Section: Methods Of Synthesizing Alloy Nanoparticlesmentioning

confidence: 99%

Synthesis, Properties, and Biological Applications of Metallic Alloy Nanoparticles

Huynh

Pham

Kim

et al. 2020

IJMS

146

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“…In Au/Fe −60, these Au 4f7/2 and Au 4f5/2 features are found at 83.93 and 87.63 eV, respectively, and these are lower than the respective features in the other samples; this is in good agreement with earlier reports.33−35 All of the Au 4f peaks indicate the formation of Au 0 , which implies the complete reduction of Au 3+ ions. The shift of Au 4f for Au/Fe −60 compared to that of other samples is attributed to negative charge buildup on the Au atoms upon Au/Fe as a result of Au (2.54) being more electronegative than Fe (1.83),31,36−39 which can always be seen in the Au alloy with the other metal40,41 implies the Au and Fe have a strong connection. Because the sample was exposed in the air when it was taken out from the solution, the Fe may be oxidized by the oxygen in the air.…”

mentioning

confidence: 93%

Rational Design of Ultrasmall Au Nanoparticles on Fe via Galvanic Replacement Under −60 °C for Efficient Methanol Oxidation Reaction Catalyst

Wang

Yin

Wei

et al. 2018

ACS Appl. Energy Mater.

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It is well-known that the size of a catalyst has a huge influence on catalytic activity. Thus, developing an easy and inexpensive way to synthesize nanocatalysts with reduced size is very urgent. Here, we use galvanic replacement between Au and Fe at ultralow temperature to prepare coexisting atomically dispersed Au and small Au nanoparticles. The Au/Fe structure synthesized at −60 °C shows the largest anodic current peak (42.36 mA/mgAu) corresponding to the oxidation peak of methanol, and this is superior to the performance of other reported gold-based catalysts. Using density functional theory (DFT) calculations, we find that the small Au nanoparticles on an Fe sheet have a synergistic effect with Fe, and the Au nanoparticles on an Fe sheet results in easy absorption of OH–, which can enhance the methanol oxidation reaction. This work highlights the role of ultralow reaction temperature for the solute-phase reaction in the synthesis of a nanometal catalyst and finds a more active catalyst for the methanol oxidation reaction.

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“…Alloy nanomaterials are produced via either dry processes such as sputtering of alloy targets or wet chemistry routes including co-reduction of soluble metal precursors such as organometallic compounds and/or metal halides [2]. The wet chemistry routes are superior to the dry processes in terms of the ability to precisely control the pore-size-and/or particle-size distribution [3].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Metastable Au-Fe Alloy Using Ordered Nanoporous Silica as a Hard Template

Kumar

Thiripuranthagan

Fujita

et al. 2017

Metals

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Nanoporous Au-Fe alloy was synthesized via a wet chemistry route using ordered nanoporous silica as a hard template. The nanoporous Au-Fe consisted of aligned arrays of nanopores that were uniform in composition and ordered in hexagonal lattice, whereas Au-Fe nanoparticles synthesized without templates exhibited broad dispersions in the chemical composition and/or particle size. Nanoporous Au-Fe has potential for applications as catalysts and/or adsorbents because of the large specific surface area of 81.2 m 2 ·g −1 and high pore volume of 0.56 cm 3 ·g −1 .

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Synthesis and characterization of Au–Fe alloy nanoparticles embedded in a silica matrix by atom beam sputtering

Abstract: AuFe alloy nanoparticles (NPs) embedded in a silica matrix were synthesized using an atom beam sputtering setup. Increasing the metal fraction in the thin films from 16 at% to 33 at% results in the formation of alloy NPs.

Cited by 16 publications

References 44 publications

Synthesis, Properties, and Biological Applications of Metallic Alloy Nanoparticles

Synthesis, Properties, and Biological Applications of Metallic Alloy Nanoparticles

Rational Design of Ultrasmall Au Nanoparticles on Fe via Galvanic Replacement Under −60 °C for Efficient Methanol Oxidation Reaction Catalyst

Synthesis of Metastable Au-Fe Alloy Using Ordered Nanoporous Silica as a Hard Template

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