Open AccessThe influence of annealing conditions on the growth and structure of embedded Pt nanocrystals
Author(s) -
R. Giulian,
L. L. Araujo,
P. Kluth,
David Sprouster,
C. S. Schnohr,
Bernt Johannessen,
G. J. Foran,
M. C. Ridgway
Publication year - 2009
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.3079506
Subject(s) - annealing (glass) , transmission electron microscopy , nanocrystal , chemisorption , materials science , scattering , crystallography , analytical chemistry (journal) , ion , spectroscopy , absorption spectroscopy , chemistry , nanotechnology , adsorption , metallurgy , optics , physics , organic chemistry , chromatography , quantum mechanics
The growth and structure of Pt nanocrystals (NCs) formed by ion implantation in a-SiO2 has been investigated as a function of the annealing conditions. Transmission electron microscopy and small-angle x-ray scattering measurements demonstrate that the annealing ambient has a significant influence on NC size. Samples annealed in either Ar, O-2, or forming gas (95% N-2: 5% H-2) at temperatures ranging from 500 degrees C-1300 degrees C form spherical NCs with mean diameters ranging from 1-14 nm. For a given temperature, annealing in Ar yields the smallest NCs. O-2 and forming gas ambients produce NCs of comparable size though the latter induces H chemisorption at 1100 degrees C and above, as verified with x-ray absorption spectroscopy. This H intake is accompanied by a bond-length expansion and increased structural disorder in NCs of diameter >3 nm. © 2009, American Institute of Physic
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