Radiation-induced synthesis of mono- and multi-metallic clusters and nanocolloids

Belloni, J.; Mostafavi, Mehran; Remita, Hynd; Marignier, Jean‐Louis; Delcourt, and Marie-Odile

doi:10.1039/a801445k

Cited by 527 publications

(510 citation statements)

References 50 publications

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“…16,25 It is also known that the optical properties of species in strong interaction with the solvent depend on its polarity. Those of silver oligomers have been obtained in some other solvents 26 with which it is interesting to compare the data in methanol. The bimolecular rate constant for the reaction of e -solv with Ag + is k 1 ) (2.6 ( 0.6) × 10 10 M -1 s -1 (instead for example of 3.6 × 10 10 M -1 s -1 in water where the reaction is diffusion-controlled).…”

Section: G(nag Nmentioning

confidence: 99%

Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

et al. 2002

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The optical absorption spectra of Ag 0 , Ag 2 + , transient oligomers, and stable clusters were studied in deaerated methanol by pulse and γ-radiolysis methods and compared with data obtained from studies using other solvents. From the decay of esolv at 620 nm, the formation rate constant of Ag 0 was determined to be k(esolv + Ag + ) ) (2.6 ( 0.6) × 10 10 M -1 s -1 . The coalescence rate of transient oligomers is particularly slow and the growth process is not completed within 2 s after the pulse. The surface plasmon band of stable clusters obtained by γ-radiolysis in methanol is intense and sharp ( 385 nm ) 1.8 × 10 4 M -1 cm -1 ). The clusters are readily oxidized by oxygen. By adding methyl viologen MV 2+ to the solution containing stable silver clusters, the blue color of MV +• is transitorily observed, and the small clusters are developed into larger ones. Similarly, by pulse radiolysis of a mixture of silver cations and MV 2+ , silver atoms and MV +• are formed immediately through solvated electron scavenging, but subsequently additional MV +• are produced by reduction of MV 2+ by Ag 0 and small oligomers. In a further step, MV +• radicals reduce Ag + cations adsorbed on large clusters and let them develop eventually to larger sizes. The general mechanism of the methanol radiolysis is revisited on the basis of electron and radical scavenging by Ag + and silver clusters, and values of the yields of methanol radiolysis species are discussed in detail.

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Section: G(nag Nmentioning

confidence: 99%

Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

et al. 2002

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“…Radiolytic reduction of metal ions in solution is an efficient process to synthesize bimetallic nanoparticles of controlled size and structure. 18,19,20 Different bimetallic nanoparticles have been synthesized by this technique as either core-shell particles or alloys, depending on the dose rate, such as: Au-Ag, 21 Au-Pd, 22,23 Au-Pt, 24 Ag-Pd 25 ... The hydrated electrons and the reducing radicals produced during the radiolysis of the solvent are used to reduce metal ions.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Au-Pt nanoparticles synthesized by radiolysis: Application in electro-catalysis

et al. 2010

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“…On the other hand, the radiolytic method, particularly in the regime of pulsed electron beam with a high dose rate, has proven its efficiency to create alloyed or bilayered clusters (Belloni, 1996;Belloni et al, 1998). Thus, we intend to observe whether alloying of rhodium and silver could be achieved, at least in clusters, by radiation-induced radiolysis of variable dose rates.…”

Section: Introductionmentioning

confidence: 99%

“…Among various preparation methods (Michaelis et al, 1994;Harada et al, 1994;Tong et al, 1996;Torigoe et al, 1993), the radiolytic synthesis of nanocrystals from metal ions in solution can provide a wide variety of mono-and multimetallic systems with different structures (Belloni, 1996;Belloni et al, 1998). For instance, we have recently shown that the structure of Ag-Au composite particles depend on the dose rate of g-irradiation (Tr!…”

Section: Introductionmentioning

confidence: 99%

“…Multimetallic nanocrystals attract interest in several fields in view of their thermodynamic, electromagnetic, optical and catalytic properties (Belloni, 1996;Belloni et al, 1998;Braunstein et al, 1999;Henglein, 1993;Mulvaney, 1996;Schmid, 1994). Among various preparation methods (Michaelis et al, 1994;Harada et al, 1994;Tong et al, 1996;Torigoe et al, 1993), the radiolytic synthesis of nanocrystals from metal ions in solution can provide a wide variety of mono-and multimetallic systems with different structures (Belloni, 1996;Belloni et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Radiation-induced reduction of mixed silver and rhodium ionic aqueous solution

Torigoe

Remita

Beaunier

et al. 2002

Radiation Physics and Chemistry

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Silver and rhodium metal nanoparticles were synthesized by electron beam and g-radiolysis of mixed solutions containing (Rh II acetate) dimer and Ag + sulfate in variable proportions. From the observation of the optical absorption spectra, transmission electron microscopic images and local X-ray analysis at increasing doses, it is concluded that the metals are segregated into two populations, which are randomly distributed according to the mixture content, one of 1.5-2 nm pure rhodium clusters, and the other of 15-20 nm pure silver clusters. At complete reduction of both metals, the Ag nanoparticles are systematically surrounded by the small rhodium clusters. r

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Radiation-induced synthesis of mono- and multi-metallic clusters and nanocolloids

Cited by 527 publications

References 50 publications

Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

Bimetallic Au-Pt nanoparticles synthesized by radiolysis: Application in electro-catalysis

Radiation-induced reduction of mixed silver and rhodium ionic aqueous solution

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