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

Journal Article · Wed Sep 24 00:00:00 EDT 2014 · J. Phys. D

DOI:https://doi.org/10.1088/0022-3727/44/15/155402· OSTI ID:1028513

Giulian, R.; Araujo, L. L.; Kluth, P.; Sprouster, D. J.; Schnohr, C. S.; Byrne, A. P.; Ridgway, M. C. ^[1]

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1. ANU

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.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: FOREIGN
• OSTI ID: 1028513
• Journal Information: J. Phys. D, Vol. 44, Issue (15) ; 03, 2011; ISSN 0022-3727
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
BONDING
DESORPTION
DISSOLUTION
FINE STRUCTURE
HEAVY IONS
IRRADIATION
SPECTROSCOPY