The controllable preparation of platinum nanoparticles with defined shapes, including sphere, octahedron, octapods and
tetrapods, was realized by varying the concentration of NaNO3 in the solvothermal process. NaNO3 plays a critical role
in synthesizing Pt nanoparticles with different shapes. These Pt nanoparticles were self-assembled on glass substrates to
study the influence of metal nanoparticles' shape on their SERS enhancement using 4-mercaptopyridine as molecules
probes. Thanks to the enhanced local field effect around their sharp corners and edges, those Pt tetrapods exhibit
enhanced SERS properties than those particles with other shapes.
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