Optical properties of gold nano-square plates synthesized in dynamic phase separating media of 2-butoxyethanol water

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The formation and growth mechanism and the optical property of gold nano-square plates synthesized via laser-induced photo-reduction gold ions in dynamic phase separating media were investigated. Phase separation was initiated by a nanosecond IR pulse, and after certain delay time, a UV pulse was introduced to induce photo-reduction in phase separating media, leading the formation of gold nanostructures. Based on the irradiation time and delay time dependence of the size distribution of gold nano-square plates synthesized, we concluded that the growth process of nano-squares by repetitive irradiation of IR and UV pulses was governed by the size of nanophases during phase separation. Optical properties of gold nano-square plates were also investigated. By taking SEM images, dark field images and scattering spectra of the same nanostructures, the size and orientation dependence of optical property was determined.