Abstract
Silica nanowires grown from gold droplets deposited on the surface of a silicon crystalsometimes develop within them a regular series of gold beads distributed along the wireaxis in what is often called either a bead-string or a pea-pod structure. This is generallyattributed to a ‘Rayleigh instability’ driven by the surface free energy of theincluded gold core. Here a new model is proposed in which quasi-conical goldinclusions are developed by the diffusion-limited growth process and are subsequentlymodified to spherical shape by another diffusion process that is driven by surface freeenergy. This model provides a possible basis for detailed numerical calculations.
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