Abstract
The spontaneous formation of hollow nanotubes at the heteroepitaxial interface between near lattice-matched PbSe and ZnTe is reported. Mass-spectroscopy measurements show that the rapid diffusion of zinc into PbSe, and reduced diffusion of Pb outward, governs the formation of the nanotubes by a Kirkendall vacancy-condensation mechanism. High-resolution electron microscopy shows that the diameter of the tubes ranges from 10 to 100 nm, and the spacing between neighboring nanotubes is consistent with the equilibrium spacing of misfit dislocations, suggesting that the strain field of misfit dislocations acts as the nucleation site of the nanotubes.
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