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

研究了激光诱导光还原金离子在动态相分离介质中合成的金纳米方片的形成、生长机理和光学性能。通过纳秒级红外脉冲引发相分离，在一定延迟时间后，引入紫外脉冲诱导相分离介质的光还原，形成金纳米结构。基于辐照时间和延迟时间对合成的金纳米方片尺寸分布的依赖性，我们得出了红外和紫外脉冲重复辐照下纳米方片的生长过程受相分离过程中纳米相尺寸的支配。研究了金纳米方片的光学性质。通过对相同纳米结构的SEM图像、暗场图像和散射光谱的分析，确定了其光学性质与尺寸和取向的关系。

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.