Journal
SMALL
Volume 9, Issue 18, Pages 3111-3117Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201203233
Keywords
galvanic replacement; gold; nanoframes; silver; cubic structures
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Funding
- NIH [R01 CA13852701]
- Georgia Institute of Technology
- National Science Council, Taiwan
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A facile, robust approach to the synthesis of Au cubic nanoframes is described. The synthesis involves three major steps: 1) preparation of Au-Ag alloyed nanocages using a galvanic replacement reaction between Ag nanocubes and HAuCl4; 2) deposition of thin layers of pure Au onto the surfaces of the nanocages by reducing HAuCl4 with ascorbic acid, and; 3) formation of Au cubic nanoframes through a dealloying process with HAuCl4. The key to the formation of Au cubic nanoframes is to coat the surfaces of the Au-Ag nanocages with sufficiently thick layers of Au before they are dealloyed. The Au layer could prevent the skeleton of a nanocage from being fragmented during the dealloying step. The as-prepared Au cubic nanoframes exhibit tunable localized surface plasmon resonance peaks in the near-infrared region, but with much lower Ag content as compared with the initial Au-Ag nanocages.
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