After the successful synthesis of silver nanoplates with shapes of truncated triangle and disk applying a seed-mediated growth process using cetyltrimethylarnmonium bromide as a shape controller, we here further report the method for systematic control of the size of silver nanoplate in 2-dimensions. Two ways are found effective in size control: one is through the change of the silver seed amounts, which can produce the nanoplates with the size varying from 210 nm to 40 nm; another is through the mild aging of the as-prepared silver nanoplate solution at a proper temperature, which can fine-tune the shape of the uanoplates, such as from triangle to circle, or from plate to sphere. X-ray and electron diffraction analysis reveal that these nanoplates are single crystals and with their basal plane as (111) planes. The in-plane dipole plasmon band of these nanoplates can thus be manipulated within 900 nm to 400 nm, providing new possibilities for applications in the fields such as infrared absorption, nonlinear optical limiting, and Raman or biochemical diagnosis.
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