Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 1, Issue 23, Pages 3360-3365Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz101436a
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Funding
- NSF [DMR-0449933, DMR-1006069, EEC-0118025]
- Northwestern University Materials Research Science & Engineering Center [NSF DMR-0520513]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006069] Funding Source: National Science Foundation
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Elemental metal nanoparticles are widely used to catalyze semiconductor nanowire growth, but size-controlled alloy nanoparticles have not been explored in this context. We present a simple aqueous synthesis of Au-Cu2O core-shell nanoparticles to produce Au-Cu alloy nanoparticles of controlled size and composition by vacuum annealing. Colloidal Au nanoparticles were used as size-controlled seeds, and fine control of the Cu2O shell thickness enabled tuning of the average Au-Cu alloy composition. The alloy nanoparticles were found to catalyze Ge nanowire growth in a low-pressure chemical vapor deposition environment. The nanowire growth rate for Au-Cu nanoparticles was intermediate to that of Cu (slowest) and Au (fastest) nanoparticles under identical conditions, suggesting a vapor-solid-solid growth process. These catalysts provide a useful platform to explore the influence of catalyst phase and chemistry on nanowire growth mechanisms that determine important variables including the doping rate and junction abruptness.
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