Anions are common intrinsic or extrinsic additives included in the synthesis of nanoparticles but their exact role in nanoparticle growth is still unknown.  The size distribution of nanoparticles varies considerably with the ligand anions intrinsic to the metal precursor and free anions in solution.  We utilized various platinum precursors and acids to examine the influence of ligand anion and free anion types on the kinetics of reduction, nucleation and crystal growth.  The kinetics of reduction, nucleation and particle growth have been studied by the direct, quantitative measurement of oxidation state speciation, evaluation of surface chemistry and the local environment with in-situ X-ray absorption spectroscopy.  Kinetic parameters for various platinum precursors have been evaluated in the presence and absence of free halide ions.

Influence of anions on formation of platinum nanoparticles studied by in situ time-resolved X-ray absorption spectroscopy

244th National Meeting (2012)

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