On the importance of boundary conditions on nanomechanical bending behavior and elastic modulus determination of silver nanowires
简介:Nanomechanical bending behavior and elastic modulus of silver nanowires 65–140 nm
suspended across silicon microchannels were investigated using digital pulsed force mode DPFM
atomic force microscopy through coinc简介:Nanomechanical bending behavior and elastic modulus of silver nanowires 65–140 nm
suspended across silicon microchannels were investigated using digital pulsed force mode DPFM
atomic force microscopy through coincident imaging and force profiling. Deflection profiles
analyzed off-line demonstrate the role of bending nanowire shape and symmetry in experimentally
determining boundary conditions, eliminating the need to rely on isolated midpoint bending
measurements and the usual assumptions for supported-end behavior. Elastic moduli for as-prepared
silver nanowires ranged from 80.4±5.3 to 96.4±12.8 GPa, which met or exceeded the literature
values for bulk silver. The calculated moduli were based on classic modeling, both with
one-dimensional analytical solutions and three-dimensional finite element analysis. Modeling
results indicate that the classic models are accurate as long as the boundary conditions are not
arbitrarily assumed but directly confirmed by data analysis. DPFM also facilitated the experimental
determination of sample gauge lengths from images and bending profiles.详细>