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Abstract
Multipod Au nanoparticles (nanostars) with single crystalline tipswere synthesized in extremely high yield through the reduction ofHAuCl4 in a concentrated solution of poly(vinylpyrrolidone) (PVP) inN,N-dimethylformamide (DMF), in the presence of preformed Au nanoparticle seeds, but withno need for external energy sources. Nanostar dispersions display a well-definedoptical response, which was found (through theoretical modeling) to comprise amain mode confined within the tips and a secondary mode confined in the centralbody. Calculations of the surface enhanced Raman scattering (SERS) responseadditionally show that this morphology will be relevant for sensing applications.
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