Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 31, Pages 16958-16964Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202105856
Keywords
dimers; oxidative ripening; plasmonic nanostructures; seed-mediated growth
Categories
Funding
- U.S. National Science Foundation [CHE-1808788]
- National Natural Science Foundation of China [51901147]
- 111 Project
- Collaborative Innovation Center of Suzhou Nano Science, Technology (NANO-CIC)
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The introduction of a thin layer of metal with considerable lattice mismatch can effectively induce the nucleation of well-defined Au islands on Au nanocrystal seeds, leading to complex Au nanostructures with morphologies tunable from core-satellites to tetramers, trimers, and dimers by controlling the interfacial energy between the seed and the deposited material, the oxidative ripening, and the surface diffusion of metal precursors.
Engineering the nucleation and growth of plasmonic metals (Ag and Au) on their pre-existing seeds is expected to produce nanostructures with unconventional morphologies and plasmonic properties that may find unique applications in sensing, catalysis, and broadband energy harvesting. Typical seed-mediated growth processes take advantage of the perfect lattice match between the deposited metal and seeds to induce conformal coating, leading to either simple size increases (e.g., Au on Au) or the formation of core-shell structures (e.g., Ag on Au) with limited morphology change. In this work, we show that the introduction of a thin layer of metal with considerable lattice mismatch can effectively induce the nucleation of well-defined Au islands on Au nanocrystal seeds. By controlling the interfacial energy between the seed and the deposited material, the oxidative ripening, and the surface diffusion of metal precursors, we can regulate the number of islands on the seeds and produce complex Au nanostructures with morphologies tunable from core-satellites to tetramers, trimers, and dimers.
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