Spontaneous formation of silver particles in basic 2-propanol

Huang, Zhiqi; Mills, G.; Hájek, B.

doi:10.1021/j100146a031

Cited by 205 publications

(186 citation statements)

References 4 publications

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“…That is, it can be said that the reduction reaction of Ag + ions decreases with decreasing concentration of NaOH. This result is consistent with that obtained for the AgNO 3 -basic 2-propanol system (18). In addition, the difference in the observed rate constant between the two sugar balls can be correlated with the intersugar distance.…”

Section: Agno 3 -Sugar Ball Systemsupporting

confidence: 92%

Formation of Gold and Silver Nanoparticles in Aqueous Solution of Sugar-Persubstituted Poly(amidoamine) Dendrimers

Esumi

Hosoya

Suzuki

et al. 2000

Journal of Colloid and Interface Science

141

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Section: Agno 3 -Sugar Ball Systemsupporting

confidence: 92%

Formation of Gold and Silver Nanoparticles in Aqueous Solution of Sugar-Persubstituted Poly(amidoamine) Dendrimers

Esumi

Hosoya

Suzuki

et al. 2000

Journal of Colloid and Interface Science

141

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“…The oxidation by air of small silver particles in basic alcoholic solution has been also suggested. 5 This result implies that the redox potential of at least part of the clusters, which are probably complexed in methanol solution, is lower than that of the oxygen couple E°O 2 /O 2 -) -0.16 V NHE (in water).…”

Section: Resultsmentioning

confidence: 96%

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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“…It is well known that Ag + can be photochemically reduced in the presence of an appropriate electron donor, [33] and this approach has been employed to prepare Ag colloids in solution. [34] In solid-state host materials, such as homopolymers, [35] blend polymers, [36] polymer micelles, [37] polymer gels, [38] or DNA, [39] even successfully fabricated metal NPs have nearly similar sizes, but in most cases they are coagulated or randomly dispersed with uncontrollable interparticle distances. Recently, block copolymer micelles, either in solution [40] or as a thin film on a substrate, [26] have been templated to prepare metal NP arrays.…”

mentioning

confidence: 99%

Template‐ and Vacuum‐Ultraviolet‐ Assisted Fabrication of a Ag‐Nanoparticle Array on Flexible and Rigid Substrates

Kamata

Watanabe

et al. 2007

Advanced Materials

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The fabrication of well-ordered metal-nanoparticle (NP) arrays on either rigid or flexible substrates is of considerable interest in modern science and technology for applications as diverse as electronics, photonics, informatics, sensors, and catalysis.[1] For example, nanofabrication on optically transparent flexible substrates is spawning novel and unique applications, including plastic electronics and organic light-emitting displays.[2] A template-assisted nanofabrication strategy based on self-assembled nanostructures is one promising method for macroscopically manipulating nanopatterned surfaces for practical applications. [1][2][3][4][5][6][7][8][9] Among the potential self-assembled templates, phase-segregated block copolymers have drawn much attention because they can give rise to tunable periodic nanostructures with various geometries. [3][4][5][6][7][8][9][10] Many approaches, including physical vapor deposition, [11,12] chemical vapor deposition, [13][14][15] electroless deposition, [16,17] galvanic displacement, [18,19] electrochemical plating, [20,21] sol-gel chemistry, [22] chemical reduction, [23] and pyrolysis, [24] have been widely explored as options for arranging metal NPs onto robust substrates by using a block copolymer template. For example, very recently our group has demonstrated that Au NPs can be assembled via a site-specific recognition between hydrophilic/ hydrophobic NPs and the nanodomains of phase-segregated, amphiphilic, diblock copolymer films. [25] In contrast, a novel hybrid nanofabrication process, block copolymer lithography, [26][27][28][29][30][31][32] has recently been extensively investigated because it successfully combines advantages of both the top-down (lithography) and bottom-up (block copolymer template) techniques, where high-energy irradiation, such as laser, [26] plasma, [27][28][29] electron beam, [30] or ion beam, [31,32] has been utilized to both generate periodic arrays of nano-objects and remove the copolymer template in a single step. [3][4][5][6][7][8][9] Unfortunately, less attention has been paid to the site-selective metallization of long-range-ordered nanostructures on optically transparent polymer substrates, potentially leading to flexible electronic and photonic devices beyond conventional Si-based technology.[1] A further challenge is to develop a versatile procedure for efficient nanostructure fabrication on both soft and hard substrates.[2] Herein, we demonstrate the simple but widely applicable vacuum ultraviolet (VUV)-assisted nanofabrication of a hexagonally arranged, high-density Ag-NP array with a tunable interparticle distance on either a rigid or flexible substrate over a large area. The key to the nanofabrication process described here is that the VUV irradiation drives both the photoreduction of the selectively infiltrated Ag + to metallic Ag NPs and the etching of the template of the copolymer film in one step. It is well known that Ag + can be photochemically reduced in the presence of an appropriate electron donor, [33] and this appro...

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Spontaneous formation of silver particles in basic 2-propanol

Cited by 205 publications

References 4 publications

Formation of Gold and Silver Nanoparticles in Aqueous Solution of Sugar-Persubstituted Poly(amidoamine) Dendrimers

Formation of Gold and Silver Nanoparticles in Aqueous Solution of Sugar-Persubstituted Poly(amidoamine) Dendrimers

Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

Template‐ and Vacuum‐Ultraviolet‐ Assisted Fabrication of a Ag‐Nanoparticle Array on Flexible and Rigid Substrates

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