Journal
NANO LETTERS
Volume 13, Issue 2, Pages 457-463Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl303803p
Keywords
Atomic layer deposition; Pt; nanowires; highly ordered pyrolytic graphite; nucleation; graphene
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Funding
- U.S. Department of Energy Hydrogen, Fuel Cells, and Infrastructure Program through the National Renewable Energy Laboratory [DE-AC36-08-GO28308]
- Department of Energy [DE-SC0004782]
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The formation of Pt nanowires (NWs) by atomic layer deposition on highly ordered pyrolytic graphite (HOPG) is investigated. Pt is deposited only at the step edges of HOPG and not on the basal planes, leading to the formation of laterally aligned Pt NWs. A growth model involving a morphological transition from 0-D to 1-D structures via coalescence is presented. The width of the NWs grows at a rate greater than twice the vertical growth rate. This asymmetry is ascribed to the wetting properties of Pt on HOPG as influenced by the formation of graphene oxide. A difference in Pt growth kinetics based on crystallographic orientation may also contribute.
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