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Plasmon-Driven Synthesis of Triangular Core–Shell Nanoprisms from Gold Seeds


  • This work was supported by the ONR, AFOSR, and MRSEC program of the National Science Foundation (DMR-0076097) at the Material Research Center of Northwestern University. C.A.M. is also grateful for an NIH Director's Pioneer Award.


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Outside silver, inside gold: Gold nanoparticles are used as seeds to probe the role of plasmon excitation in the photomediated growth of silver nanoprisms. This approach generates novel core–shell nanostructures that contain a spherical (see TEM image, inset shows side view) or triangular-prism gold core with a triangular silver prism shell. The architecture of these particles can be tuned by controlling the excitation wavelength and gold-core diameter.