| Autor: |
Malis O; Physics Department, Binghamton University, Binghamton, NY 13902, USA. omalis@purdue.edu, Radu M, Mott D, Wanjala B, Luo J, Zhong CJ |
| Jazyk: |
angličtina |
| Zdroj: |
Nanotechnology [Nanotechnology] 2009 Jun 17; Vol. 20 (24), pp. 245708. Date of Electronic Publication: 2009 May 27. |
| DOI: |
10.1088/0957-4484/20/24/245708 |
| Abstrakt: |
In situ real-time x-ray diffraction was used to study phase segregation and coarsening of Au-Pt nanoparticles supported on silica powder, and porous alumina membranes. Contrary to the expectations from the bulk phase diagram, silica supported Au-Pt nanoparticles have an alloyed structure that is preserved even after extensive annealing at temperatures as high at 700 degrees C. In stark contrast, alumina supported Au-Pt nanoparticles exhibit a rich phase behaviour that is sensitive to alloy composition and the details of the synthesis process. In particular, low-density as-prepared Au(41)Pt(59) nanoparticles exhibit the signature of incipient phase segregation that develops into full phase separation during annealing at high temperature. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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