Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 18, Issue 47, Pages 14974-14980Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201202477
Keywords
copper; galvanic replacement; gold; nanocages; yolk-shell structure
Categories
Funding
- NSF [DMR-1215034]
- Georgia Institute of Technology
- China Scholarship Council (CSC)
- U.S. Department of Energy, Basic Energy Sciences, by the Materials Sciences and Engineering Division [DE-AC02-98CH10886]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1215034] Funding Source: National Science Foundation
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This paper describes the synthesis of Pd@MxCu1-x (M=Au, Pd, and Pt) nanocages with a yolkshell structure through galvanic replacement reactions that involve Pd@Cu coreshell nanocubes as sacrificial templates and ethylene glycol as the solvent. Compared with the most commonly used templates based on Ag, Cu offers a much lower reduction potential (0.34 versus 0.80 V), making the galvanic reaction more easily to conduct, even at room temperature. Our structural and compositional characterizations indicated that the products were hollow inside, and each one of them contained porous MCu alloy walls and a Pd cube in the interior. For the Pd@AuxCu1-x yolkshell nanocages, they displayed broad extinction peaks extending from the visible to the near-IR region. Our mechanistic study revealed that the dissolution of the Cu shell preferred to start from the slightly truncated corners and then progressed toward the interior, because the Cu {100} side faces were protected by a surface capping layer of hexadecylamine. This galvanic approach can also be extended to generating other hollow metal nanostructures by using different combinations of Cu nanostructures and salt precursors.
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