The invention is a novel photo-induced method for converting large
quantities of silver nanospheres into nanoprisms, the nanoprisms formed
by this method and applications in which the nanoprisms are useful.
Significantly, this light driven process results in a colloid with a
unique set of optical properties that directly relate to the nanoprism
shape of the particles. Theoretical calculations coupled with
experimental observations allow for the assignment of the nanoprism
plasmon bands and the first identification of two distinct quadrupole
plasmon resonances for a nanoparticle. Finally, unlike the spherical
particles from which they derive and which Rayleigh light scatter in the
blue, these nanoprisms exhibit scattering in the red, permitting
multicolor diagnostic labels based not only on nanoparticle composition
and size but also on shape.