Strained Relations

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Science  20 Jul 2007:
Vol. 317, Issue 5836, pp. 292
DOI: 10.1126/science.317.5836.292e

When films are grown on surfaces through vapor-phase deposition, complex heterostructures can form because of strains that arise through lattice mismatches. Robinson et al. (p. 355) show in a solution environment that the complex superlattices can form spontaneously in cadmium sulfide nanorods through the controlled introduction of silver cations. Alternating layers of cadmium sulfide and silver sulfide form along the axis of the rod because the lattice-mismatch strain that builds up during silver infiltration limits the growth of the silver sulfide domains. The control over growth achieved by changing the solution parameters and nanowire dimensions was used to tune the near-infrared emission from these nanorods.

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