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Methyl monolayers improve the fracture strength and durability of silicon nanobeams

Appl. Phys. Lett. 89, 231905 (2006); doi:10.1063/1.2400180

Published 4 December 2006

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Tuncay Alan and Alan T. Zehnder
Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, New York 14853

Debodhonyaa Sengupta and Melissa A. Hines
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853
Monolayer-thick coatings have a significant effect on the fracture strength and durability of 210-nm-thick, smooth (~0.4  nm rms roughness), single crystal silicon nanobeams. The initial Weibull fracture strength of beams terminated with a methyl (CH3) monolayer was 18.2  GPa. This strength did not degrade after a 23-day exposure to air. In contrast, beams terminated with a monolayer of hydrogen atoms were initially weaker than methyl-terminated beams, and their strength degraded rapidly in air. After a 23-day air exposure, the strength of H-terminated beams was reduced by at least 30%. Since strength durability is correlated with the oxidation resistance of the monolayers, the degradation of H-terminated beams is attributed to the formation of oxide nuclei that act as local stress concentrators. ©2006 American Institute of Physics
History: Received 30 August 2006; accepted 24 October 2006; published 4 December 2006
Permalink: http://link.aip.org/link/?APPLAB/89/231905/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.40.Np
    Fatigue, embrittlement, fracture, and failure including corrosion fatigue and cracking
  • 62.20.Mk
    Fatigue, brittleness, fracture, and cracks
  • 68.47.Pe
    Langmuir–Blodgett films on solids; polymers on surfaces; biological molecules on surfaces
  • 82.65.+r
    Surface and interface chemistry; heterogeneous catalysis at surfaces
  • 81.65.Mq
    Surface oxidation
  • YEAR: 2006

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