Recrystallized arrays of bismuth nanowires with trigonal orientation.
basic_science · Level V
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- Record sourced from PubMed, PMID 24548238.
- Also identified by DOI 10.1021/nl404752p.
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Abstract
We demonstrate methods to improve the crystalline-quality of free-standing Bi nanowires arrays on a Si substrate and enhance the preferred trigonal orientation for thermoelectric performance by annealing the arrays above the 271.4 °C Bi melting point. The nanowires maintain their geometry during melting due to the formation of a thin Bi-oxide protective shell that contains the molten Bi. Recrystallizing nanowires from the melt improves crystallinity; those cooled rapidly demonstrate a strong trigonal orientation preference.