The DOI matches its Crossref record.
Alloying and Dealloying Processes Involved in the Preparation of Metal Nanoshells through a Galvanic Replacement Reaction
Abstract
The galvanic replacement reaction between Ag nanoparticles and an aqueous HAuCl 4 solution has recently been demonstrated as a simple and convenient route to metal nanostructures with hollow interiors and highly crystalline walls (see, for example, Sun, Y.; Mayers, B. T.; Xia, Y. Nano Lett. 2002, 2, 481. Sun, Y.; Xia, Y. Science, 2002, 298, 2176). However, the details of morphological, compositional, structural, and spectral changes involved in the entire process of this template-engaged reaction is yet to be elucidated. The experimental results described in this letter indicate that the templating process proceeded through two distinctive steps: (i) formation of pinhole-free nanoshells with homogeneous, uniform walls of Au/Ag alloys via a combination of the replacement reaction and alloying; and (ii) formation of porous nanoshells (nanocages) through a dealloying process, in which Ag was selectively dissolved from the walls made of Au/Ag alloys. As alloying and dealloying proceeded, the surface plasmon resonance peaks of resultant metal nanostructures could be continuously tuned from ∼425 to ∼1030 nm.
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Metadata
- Authors
- Sun, Y., & Xia, Y.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2003-10-08
- Volume
- 3
- Issue
- 11
- Pages
- 1569-1572
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2068346293
- Cited by
- 348
- References
- 0
- FWCI
- 5.71
- Type
- journal article
- Language
- en
- Open access
- closed
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