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Wrinkling of Atomic Planes in Ultrathin Au Nanowires

DSpace at IIT Bombay

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Title Wrinkling of Atomic Planes in Ultrathin Au Nanowires
 
Creator ROY, A
KUNDU, S
MULLER, K
ROSENAUER, A
SINGH, S
PANT, P
GURURAJAN, MP
KUMAR, P
WEISSMULLER, J
SINGH, AK
RAVISHANKAR, N
 
Subject Au nanowire
wrinkling
surface stress
aberration-corrected microscopy
TRANSMISSION ELECTRON-MICROSCOPY
GOLD NANOWIRES
SURFACE-STRESS
METAL NANOWIRES
WIRES
NANOPARTICLES
NANOPILLARS
ABERRATION
RESOLUTION
CRYSTAL
 
Description A detailed understanding of structure and stability of nanowires is critical for applications. Atomic resolution imaging of ultrathin single crystalline Au nanowires using aberration-corrected microscopy reveals an intriguing relaxation whereby the atoms in the close-packed atomic planes normal to the growth direction are displaced in the axial direction leading to wrinkling of the (111) atomic plane normal to the wire axis. First-principles calculations of the structure of such nanowires confirm this wrinkling phenomenon, whereby the close-packed planes relax to form saddle-like surfaces. Molecular dynamics studies of wires with varying diameters and different bounding surfaces point to the key role of surface stress on the relaxation process. Using continuum mechanics arguments, we show that the wrinkling arises due to anisotropy in the surface stresses and in the elastic response, along with the divergence of surface-induced bulk stress near the edges of a faceted structure. The observations provide new understanding on the equilibrium structure of nanoscale systems and could have important implications for applications in sensing and actuation.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-12-28T12:59:35Z
2014-12-28T12:59:35Z
2014
 
Type Article
 
Identifier NANO LETTERS, 14(8)4859-4866
1530-6984
1530-6992
http://dx.doi.org/10.1021/nl502259w
http://dspace.library.iitb.ac.in/jspui/handle/100/16638
 
Language English