Journal
PHYSICAL REVIEW E
Volume 79, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.79.026302
Keywords
laser materials processing; nanolithography; nanoparticles; nanopatterning; nickel; wetting
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Funding
- Oak Ridge National Laboratory's Center for Nanophase Materials Sciences
- U. S. Department of Energy
- Consejo Nacional de Investigaciones CientIficas y TEcnicas de la Rep blica Argentina (CONICET)
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT) [PICT 2498/06]
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Nanosecond pulsed laser heating was used to control the assembly of spatially correlated nanoparticles from lithographically patterned pseudo-one-dimensional nickel lines. The evolution of the nickel line instabilities and nanoparticle formation with a correlated size and spacing was observed after a series of laser pulses. To understand the instabilities that direct the nanoparticle assembly, we have carried out nonlinear time-dependent simulations and linear stability analysis based on a simple hydrodynamic model. We find that the simulated time scales and length scales agree well with the experimental results. Interestingly, in both experiments and simulations, the instabilities associated with the line edge, and with the surface perturbation-driven mechanism, are found to result in similar particle sizes and spacings.
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