Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 12, Pages 4349-4357Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b00958
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Funding
- National Science Foundation [1361702, 1361741, 1064159]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1361702, 1361741] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1064159] Funding Source: National Science Foundation
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A synthetic protocol developed to produce phase-pure, nearly monodisperse Ni2-xCoxP nanoparticles (x <= 1.7) is described. The Ni2-xCoxP particles vary in size, ranging from 914 nm with standard deviations of <20% (based on transmission electron microscopy analysis), and the actual metal ratios obtained from energy-dispersive spectroscopy closely follow the targeted ratios. With increasing Co, samples with larger size distributions are obtained and include particles with voids, attributed to the Kirkendall effect. To probe the mechanism of ternary phosphide particle formation, detailed studies were conducted for Ni:Co = 1:1 as a representative composition. It was revealed that the P:M ratio, heating temperature, and heating time have a large impact on the nature of both intermediate and final crystalline particles formed. By tuning these conditions, nanoparticles can be produced with different sizes (from ca. 7-25 nm) and morphologies (hollow versus dense).
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