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Issue 1, 2017
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Depletion sphere: Explaining the number of Ag islands on Au nanoparticles

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Abstract

We report multi-site nucleation and growth of Ag islands on colloidal Au nanoparticles. By modifying a single factor, a range of products from Janus nanoparticles to satellite nanostructures are obtained. The identification of these key factors reveals the correlation between the concentration gradient and the choice of nucleation sites. In contrast to the inhibited homogeneous nucleation in the bulk solution, we argue that the non-steady-state concentration gradient plays a critical role in inhibiting nucleation within nanometer distance during the initial stage of growth—an essential but not yet recognized factor in colloidal synthesis. A depletion sphere model was developed, so that the multi-site nucleation is well integrated with the classic theory of nucleation and growth. Alternative explanations are carefully examined and ruled out. We believe that the synthetic know-how and the mechanistic insights can be broadly applied and are of importance to the advance of nanosynthesis.

Graphical abstract: Depletion sphere: Explaining the number of Ag islands on Au nanoparticles

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Publication details

The article was received on 22 May 2016, accepted on 17 Aug 2016 and first published on 17 Aug 2016


Article type: Edge Article
DOI: 10.1039/C6SC02276F
Citation: Chem. Sci., 2017,8, 430-436
  • Open access: Creative Commons BY license
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    Depletion sphere: Explaining the number of Ag islands on Au nanoparticles

    Y. Feng, Y. Wang, X. Song, S. Xing and H. Chen, Chem. Sci., 2017, 8, 430
    DOI: 10.1039/C6SC02276F

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