Peter Njoki - Aggregative Growth in the Size-Controlled Growth of Monodispersed Gold Nanoparticles

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      Publication Details (including relevant citation   information):

      LANGMUIR    Volume: 26    Issue:   16    Pages: 13622-13629      Published: AUG 17 2010

      Abstract:

      This article describes the findings of an investigation of   the  aggregative growth mechanism for the formation of gold   nanoparticles in  aqueous solutions under ambient conditions   with high monodispersity (2%  RSD) over a wide range of   particle sizes (10-100 nm). The utilization of  the gold   nanoparticles synthesized by this simple, reproducible   growth  mechanism has recently been demonstrated for   establishing the size  correlation for the surface plasmon   resonance optical and  surface-enhanced Raman scattering   spectroscopic properties. The particle  size, morphology,   and optical properties of the nanoparticles produced  at   different stages of the growth processes were determined as   a  function of control parameters such as the reaction time   and  seed/precursor concentrations. The results have allowed   us to establish a  quantitative correlation between the   growth size and the seed/precursor  concentrations for the   precise control of nanoparticle sizes. The  kinetic   measurements have demonstrated a polycrystalline character   for  the grown particles, a bimodal size distribution in the   early stage of  growth, sigmoidal kinetic behavior for the   growth, and a correlation of  the nucleation parameters with   the particle size and distribution. These  findings provided   important indicators for the operation of an  aggregative   growth mechanism in the particle size growth and have    important implications in understanding interparticle aggregation   and  coalescence in nanoparticle formation and growth under   similar  conditions.

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