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| - A Mechanism for Transition-Metal Nanoparticle Self-Assembly
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| - The four-step mechanism by which transition-metal nanoclusters or bulk-metal films self-assemblefrom metal salts under reductive conditions has been discovered. The presence of two autocatalytic stepsin the same reaction schemedouble autocatalysisis the key to the sharp “turn-on” feature after aninduction period observed in the signature kinetic curves. Predictions of the new mechanism that are testedexperimentally include the following: that low concentrations and high temperatures will favor nanoclustersover bulk-metal film formation; that bulk-metal is formed in some, if not many, literature syntheses reportingonly 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.
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