Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5359130 | Applied Surface Science | 2009 | 5 Pages |
Abstract
The morphology of metal nanoparticles supported on oxide substrates plays an important role in heterogeneous catalysis and in the nucleation of thin films. For platinum evaporated onto SrTiO3 (0Â 0Â 1) and vacuum annealed we find an unexpected growth formation of Pt nanoparticles that aggregate into clusters without coalescence. This hierarchical nanoparticle morphology with an enhanced surface-to-volume ratio for Pt is analyzed by grazing incidence small-angle X-ray scattering (GISAXS), X-ray fluorescence (XRF), atomic force microscopy (AFM) and high-resolution scanning electron microscopy (SEM). The nanoparticle constituents of the clusters measure 2-4Â nm in size and are nearly contiguously spaced where the average edge-to-edge spacing is less than 1Â nm. These particles make up the clusters, which are 10-50Â nm in diameter and are spaced on the order of 100Â nm apart.
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Authors
Steven T. Christensen, Byeongdu Lee, Zhenxing Feng, Mark C. Hersam, Michael J. Bedzyk,