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A Mechanism for Transition-Metal Nanoparticle Self-Assembly.

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Title: A Mechanism for Transition-Metal Nanoparticle Self-Assembly.
Authors: Besson, Claire1, Finney, Eric F.1, Finke, Richard G.1 rfinke@lamar.colostate.edu
Source: Journal of the American Chemical Society. 6/8/2005, Vol. 127 Issue 22, p8179-8184. 6p.
Subjects: Nanoparticles, Nanocrystals, High temperatures, Lathes, Metals, Crystals
Abstract: The four-step mechanism by which transition-metal nanoclusters or bulk-metal films self-assemble from metal salts under reductive conditions has been discovered. The presence of two autocatalytic steps in the same reaction scheme--double autocatalysis--is the key to the sharp "turn-on" feature after an induction period observed in the signature kinetic curves. Predictions of the new mechanism that are tested experimentally include the following: that low concentrations and high temperatures will favor nanoclusters over bulk-metal film formation; that bulk-metal is formed in some, if not many, literature syntheses reporting only Pt0 nanoclusters; and that added ligands are one key to turning on the new mechanism. Particle-size-dependent metal-ligand bond dissociation energies are another implication from this mechanistic work. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Chemical Society is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 17320236
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: A Mechanism for Transition-Metal Nanoparticle Self-Assembly.
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  Data: <searchLink fieldCode="AR" term="%22Besson%2C+Claire%22">Besson, Claire</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Finney%2C+Eric+F%2E%22">Finney, Eric F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Finke%2C+Richard+G%2E%22">Finke, Richard G.</searchLink><relatesTo>1</relatesTo><i> rfinke@lamar.colostate.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Chemical+Society%22">Journal of the American Chemical Society</searchLink>. 6/8/2005, Vol. 127 Issue 22, p8179-8184. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocrystals%22">Nanocrystals</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Lathes%22">Lathes</searchLink><br /><searchLink fieldCode="DE" term="%22Metals%22">Metals</searchLink><br /><searchLink fieldCode="DE" term="%22Crystals%22">Crystals</searchLink>
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  Label: Abstract
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  Data: The four-step mechanism by which transition-metal nanoclusters or bulk-metal films self-assemble from metal salts under reductive conditions has been discovered. The presence of two autocatalytic steps in the same reaction scheme--double autocatalysis--is the key to the sharp "turn-on" feature after an induction period observed in the signature kinetic curves. Predictions of the new mechanism that are tested experimentally include the following: that low concentrations and high temperatures will favor nanoclusters over bulk-metal film formation; that bulk-metal is formed in some, if not many, literature syntheses reporting only Pt0 nanoclusters; and that added ligands are one key to turning on the new mechanism. Particle-size-dependent metal-ligand bond dissociation energies are another implication from this mechanistic work. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of the American Chemical Society is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1021/ja0504439
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        Text: English
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        Type: general
      – SubjectFull: Nanocrystals
        Type: general
      – SubjectFull: High temperatures
        Type: general
      – SubjectFull: Lathes
        Type: general
      – SubjectFull: Metals
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      – SubjectFull: Crystals
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      – TitleFull: A Mechanism for Transition-Metal Nanoparticle Self-Assembly.
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              Text: 6/8/2005
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