Localized surface plasmon resonance which gold nanoparticles show enhance optical electric-field intensely around the surface of them. It is used for sensitive analysis such as SERS. The stronger effect of enhancement appears around the sharp edges of triangular-shaped gold nanoparticles. In this research, for getting triangular plate nanoparticles in high concentration, we suggested separating spherical and triangular plate nanoparticles by using the difference of velocity of nanoparticles, caused by the difference of the shape. We synthesized nanoparticles, constructed the formula of velocity about each shaped particle, fabricated the device and evaluated it.
