Abstract
Bimetallic core–shell nanostructures are of great interest because of their unique properties. Although bimetallic core–shell nanostructures with plenty of shapes are prepared, synthesis of core–shell nanostructures with asymmetric core and shells is still elusive. This work reports a facile seed-mediated synthesis of Au@Ag right bipyramids with high yield (>95%) and broadly tunable edge length (from ≈130 to ≈230 nm) as well as tunable localized surface plasmon resonance properties. For the first time, a four-leaf-clover-like tetramer of bipyramids is obtained through self-assembly of the synthesized Au@Ag right bipyramids. The as-assembled structure performs well in surface-enhanced Raman spectroscopy with an analytical enhancement factor up to 1.4 × 107 because of the existence of both sharp tips and “hot-spots.” The present work not only develops a new kind of nanomaterials, but also shows promising applications in optics and sensing.
Original language | English |
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Article number | 1700114 |
Journal | Particle and Particle Systems Characterization |
Volume | 35 |
Issue number | 5 |
DOIs | |
State | Published - May 2018 |
Keywords
- bimetallic nanoparticles
- seed-mediated growth
- self-assembly
- surface-enhanced Raman scattering
All Science Journal Classification (ASJC) codes
- General Chemistry
- Condensed Matter Physics
- General Materials Science