Fabrication of optically tunable silica nanocapsules containing Ag/Au nanostructures by confined galvanic replacement reaction
- 185 Downloads
Silica nanocapsules containing Ag/Au alloy nanostructures (SNCAs) are fabricated by galvanic replacement (GR) reactions between silver core nanoparticles within silica shells and aqueous HAuCl4 in a confined nano-space. The structure and morphology of the resulting SNCAs are diversified by controlling the relative amount of Ag/Au, exhibiting tunable optical absorptions in visible region. The GR reactions in a confined nano-space include alloying and de-alloying processes that determine the evolution of morphology and optical absorption of SNCAs.
KeywordsAlloys Galvanic replacement reaction Gold/Silver Nanostructures Silica Silver Sol–gel materials Nanomanufacturing
This study was supported by grants-in-aid for the National Core Research Centre Program MOST/KOSEF (R15-2006-022-01001-0), Brain Korea 21 program (BK21), and the World Class University Program (No. R32-2008-000-10174-0).
- Cavaliere-Jaricot S, Darbandia M, Nann T (2007) Au–silica nanoparticles by “reverse” synthesis of cores in hollow silica shells. Chem Commun (Camb) 2031–2033. doi: 10.1039/b703811a
- Gao Y, Ding X, Zheng Z, Cheng X, Peng Y (2007) Template-free method to prepare polymer nanocapsules embedded with noble metal nanoparticles. Chem Commun (Camb) 3720–3722. doi: 10.1039/b706490j
- Trewyn BG, Giri S, Slowing II, Lin VS (2007) Mesoporous silica nanoparticle based controlled release, drug delivery, and biosensor systems. Chem Commun (Camb) 3236–3245. doi: 10.1039/b701744h
- Wiley B, Sun Y, Chen J, Cang H, Li Z, Li X, Xia Y (2005) Shape-controlled synthesis of silver and gold nanostructures. MRS Bull 30:356–361Google Scholar