Hierarchical nanoparticle morphology for platinum supported on SrTiO3 (001): A combined microscopy and X-ray scattering study

作者：Christensen Steven T; Lee Byeongdu; Feng Zhenxing; Hersam Mark C; Bedzyk Michael J^*

来源：Applied Surface Science, 2009, 256(2): 423-427.

DOI：10.1016/j.apsusc.2009.06.017

• Nanoparticles
• Platinum
• SrTiO3
• AFM
• GISAXS
• SEM

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 (0 0 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 2-4 nm in size and are nearly contiguously spaced where the average edge-to-edge spacing is less than 1 nm. These particles make up the clusters, which are 10-50 nm in diameter and are spaced on the order of 100 nm apart.

• 出版日期2009-10-30
• 单位西北大学