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Title: Swift heavy ion irradiation of Pt nanocrystals: II. Structural changes and H desorption

The structural properties and H desorption from embedded Pt nanocrystals (NCs) following irradiation with swift heavy ions were investigated as a function of energy and fluence. From x-ray absorption near-edge spectroscopy analysis, Pt-H bonding was identified in NCs annealed in a forming gas (95% N{sub 2} + 5% H{sub 2}) ambient. The H content decreased upon irradiation and the desorption process was NC-size dependent such that larger NCs required a higher fluence to achieve a H-free state. Pt-H bonding and NC dissolution both perturbed the NC structural parameters (coordination number, bond-length and mean-square relative displacement) as determined with extended x-ray absorption fine structure measurements.
Authors:
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  1. (ANU)
Publication Date:
OSTI Identifier:
1028513
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Phys. D; Journal Volume: 44; Journal Issue: (15) ; 03, 2011
Research Org:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Org:
FOREIGN
Country of Publication:
United States
Language:
ENGLISH
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ABSORPTION; BONDING; DESORPTION; DISSOLUTION; FINE STRUCTURE; HEAVY IONS; IRRADIATION; SPECTROSCOPY