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SERRS nanoparticle characterization. Transmission electron micrographs, hydrodynamic diameters as measured by nanoparticle tracking analysis (NTA), and absorption spectra of (a) successful synthesis of SERRS nanoparticles. (b) gold nanoparticle aggregation during the silica encapsulation. (c) silica-encapsulated gold nanostars. Scale bars, 100 nm.
