期刊
CHEMISTRY OF MATERIALS
卷 26, 期 1, 页码 34-43出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm402384j
关键词
anisotropic noble metal nanoparticles; seeded growth; halides; gold
资金
- National Science Foundation's Center for Sustainable Nanotechnology [CHE-1240151]
- DARPA [HR0011-13-2-002]
- European Science Foundation (ERC) [267867]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1240151] Funding Source: National Science Foundation
Anisotropic (nonspherical) metal nanoparticles are of widespread research interest because changing the shape of metals at the nanoscale can provide access to materials with unique optical, electronic, and catalytic properties. The development of seeded growth syntheses has provided researchers unprecedented access to anisotropic metal nanocrystals (particularly, gold, silver, platinum, and palladium nanocrystals) with precisely controlled dimensions and crystallographic features. The mechanisms by which the various reagents present in seeded growth syntheses accomplish shape control, however, have yet to be fully elucidated. Recently, the role halide ions play in controlling metal nanocrystal shape has become a subject of particular interest. There are many ways in which the halide ions may direct the anisotropic growth of metal nanocrystals, including modulating the redox potentials of the metal ions, acting as face-specific capping agents, and/or controlling the extent of silver underpotential deposition at the nanocrystal surface. In this Perspective, we examine recent progress in elucidating and articulating the role halide ions play in seeded growth with particular emphasis on gold nanoparticles.
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