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    Coating nonfunctionalized silica spheres with a high density of discrete silver nanoparticles

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    Author
    Purdy, Stephen C.
    Muscat, Anthony J. cc
    Affiliation
    University of Arizona
    Issue Date
    2016-03-02
    Keywords
    Colloids
    Nanoparticle
    Nucleation
    Tollens reagent
    Diammine silver
    Surface coverage
    Core-shell
    
    Metadata
    Show full item record
    Publisher
    Springer
    Citation
    Coating nonfunctionalized silica spheres with a high density of discrete silver nanoparticles 2016, 18 (3) Journal of Nanoparticle Research
    Journal
    Journal of Nanoparticle Research
    Rights
    © Springer Science+Business Media Dordrecht 2016.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Reducing AgNO3 by glucose at basic pH coated the surface of silica spheres with a high density of hemispherical silver nanoparticles (average diameter 3.2±1 nm). A much lower silver concentration than is standard favored heterogeneous nucleation of silver on the silica surface at the expense of homogeneous nucleation in solution. The slow growth rate of the nuclei promoted the formation of discrete silver particles rather than a continuous shell. Based on scanning electron microscopy and transmission electron microscopy, the surface coverage of silver seed particles was as high as 25% at 10 °C without prior functionalization of the silica. The particles were composed of metallic silver based on x-ray photoelectron spectroscopy. There was a sharp increase in the silver surface coverage and decrease in the particle size when the temperature was raised from 5 °C to 10 °C and the amount of silica was decreased from 0.2 to 0.025 V/V. The size was controlled by the diffusion barrier through the ion shell surrounding the silica spheres and by maintaining reaction conditions where the particles on the surface compete for silver.
    ISSN
    1388-0764
    1572-896X
    DOI
    10.1007/s11051-016-3371-8
    Version
    Final accepted manuscript
    Additional Links
    http://link.springer.com/10.1007/s11051-016-3371-8
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11051-016-3371-8
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