Size Effects on the Desorption of O(2) from Au(2)O(3)/Au(0) Nanoparticles Supported on SiO(2): A TPD Study

    Authors

    L. K. Ono;B. R. Cuenya

    Comments

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    Abstract

    This article contains an in-depth study of the kinetics of O(2) desorption from preoxidized size-selected gold nanoparticles (NPs) of average size similar to 1.5 and similar to 5 nm synthesized by micelle encapsulation and supported on SiO(2). Thanks to the narrow NP size distributions achieved using our preparation route, information on the effect of the nanoparticle size on the reaction kinetics could be obtained by temperature programmed desorption (TPD). In addition, the validity of different TPD, analysis methods (Redhead, heating rate variation, Arrhenius plots, and the complete analysis) to extract meaningful kinetic parameters on supported NPs is discussed. From the different analysis methods, activation energies for O(2) desorption of E(d) = 1.3 +/- 0.2 eV and 1.7 +/- 0.1 eV were obtained for the similar to 5 and similar to 1.5 nm Au NPs, respectively. These differences in the activation energies are directly related to the nanoparticle size and not to nanoparticle-support interactions.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    112

    Issue/Number

    47

    Publication Date

    1-1-2008

    Document Type

    Article

    First Page

    18543

    Last Page

    18550

    WOS Identifier

    WOS:000261056500038

    ISSN

    1932-7447

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