期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 26, 页码 8150-8156出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201200823
关键词
gold; kinetics; nanostructures; palladium; seed-mediated growth
资金
- NSF [DMR-1105614]
- DOE from the University of Delaware [DE-FG02-03 ER15468]
- Washington University in St. Louis
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1215034] Funding Source: National Science Foundation
This article reports a systematic study of the seed-mediated growth of Au@Pd coreshell nanocrystals with a variety of controlled sizes and morphologies. The key to the success of this synthesis is to manipulate the reaction kinetics by tuning a set of reaction parameters, including the type and concentration of capping agent, the amount of ascorbic acid used as the reducing agent, and the injection rate used for the precursor solution. Starting from Au nanospheres of 11 nm in diameter as the seeds, Au@Pd coreshell nanocrystals with a number of morphologies, including octahedra, concave octahedra, rectangular bars, cubes, concave cubes, and dendrites, could all be obtained by simply altering the reaction rate. For the first time, it was possible to generate Au@Pd nanocrystals with concave structures on the surfaces while their sizes were kept below 20 nm. In addition, the as-prepared Au@Pd nanocubes can be used as seeds to generate Au@Pd@Au and Au@Pd@Au@Pd nanocrystals with multishelled structures.
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