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Title: Depletion sphere : explaining the number of Ag islands on Au nanoparticles
Authors: Feng, Yuhua
Wang, Yawen
Song, Xiaohui
Xing, Shuangxi
Chen, Hongyu
Keywords: Nanoparticles
Depletion Sphere
Issue Date: 2017
Source: Feng, Y., Wang, Y., Song, X., Xing, S., & Chen, H. (2017). Depletion sphere : explaining the number of Ag islands on Au nanoparticles. Chemical Science, 8(1), 430-436.
Series/Report no.: Chemical Science
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.
ISSN: 2041-6520
DOI: 10.1039/C6SC02276F
Rights: © 2017 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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