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A large quantity of well-defined silver nanodisks was prepared by heating silver nanoprisms in aqueous solution. By adjusting only the heating time, the conversion of the morphology and the size of the nanoplates could be easily and effectively controlled. The local surface plasmon resonance (LSPR) of the silver nanoplates could be tuned in a certain range in the heat-aging process. A gradual blue shift in their LSPR bands with the aging time was observed from 655 to 472 nm. The transformation of the morphology during heat aging was captured by the transmission electron microscopy (TEM). The TEM images indicate that the silver atoms on the corners and sides of the nanoprisms dissociate and rearrange during the period of shape transformation. The dissociation of the silver atoms at the sides of the nanoplates is overwhelming when the size shrinks, which is due to the difference in the surface energy and the …