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Applied Physics Letters / Volume 100 / Issue 4 / STRUCTURAL, MECHANICAL, OPTICAL, AND THERMODYNAMIC PROPERTIES OF ADVANCED MATERIALS

Appl. Phys. Lett. 100, 041908 (2012); http://dx.doi.org/10.1063/1.3679616 (3 pages)

Surface modification by subsurface pressure induced diffusion

Claus G. Zimmermann

EADS Astrium, 81663 Munich, Germany

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(Received 5 October 2011; accepted 9 January 2012; published online 26 January 2012)

Polycrystalline Ag, covered with a nm thin siloxane layer, was irradiated with ultraviolet light in vacuum at 500 K. Ag particles of different aspect ratios, 50–1000 nm in size, formed on the surface, including a small fraction of nanorods. Pressurized water vapor bubbles are created in the subsurface region by hydrogen radicals photo-chemically released by the siloxane layer. They provide the driving force for a diffusive material flux along grain boundaries to the surface. This mechanism was modeled and found to agree with the experimental timescale: approximately 300 h are required for a 1000 nm particle to form.

© 2012 American Institute of Physics

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KEYWORDS, PACS, and IPC

Keywords

free radical reactions, free radicals, grain boundaries, nanofabrication, nanoparticles, nanorods, organic compounds, particle size, photochemistry, silver, surface diffusion, surface treatment, ultraviolet radiation effects

PACS

  • 81.65.-b

    Surface treatments

  • 82.50.Hp

    Processes caused by visible and UV light

  • 61.72.Mm

    Grain and twin boundaries

  • 61.80.Ba

    Ultraviolet, visible, and infrared radiation effects (including laser radiation)

  • 68.35.Fx

    Diffusion; interface formation

  • 81.16.-c

    Methods of micro- and nanofabrication and processing

International Patent Classification (IPC)

  • B82B1/00

    Nano-structures

  • B82B3/00

    Manufacture or treatment of nano-structures

  • C23C

    Coating metallic material; Coating material with metallic material; Surface treatment of metallic material by diffusion into the surface, by chemical conversion or substitution; Coating by vacuum evaporation, by sputtering, by ion implantation or by chemical vapour deposition, in general

  • C23F

    Non-mechanical removal of metallic material from surfaces; Inhibiting corrosion of metallic material; Inhibiting incrustation in general; Multi-step processes for surface treatment of metallic material involving at least one process provided for in class c23 and at least one process covered by subclass c21d or c22f or class c25

  • C23G

    Cleaning or de-greasing of metallic material by chemical methods other than electrolysis

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3679616

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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