Bibliographic Details
| 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] |
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| Database: |
Engineering Source |
