SDS辅助的种子生长法制备片状纳米银

以4 nm银为种子,SDS为结构导向剂,乙二胺四乙酸二钠为还原剂,采用晶种法在溶液成功的制备了片状银纳米粒子。透射电镜及紫外-可见光谱表征指出所得的产物由厚度小于20 nm的薄的银纳米片构成。利用紫外-可见光谱仪对银纳米片的形成过程进行了研究,并探讨了反应温度、晶种量对表面等离子共振特性的影响。结果表明:温度从60℃升高到80℃可导致银纳米片的等离子共振峰位置和数目发生明显的变化,继续升高温度则无明显的影响;同时,晶种量不仅能影响纳米Ag的尺寸,而且会影响其形成反应速率。

SDS-assisted seed-growth preparation of plate-like Ag nanostructure

By using the Ag particles with size of 4 nm as seed,the SDS as structure-directed agent and the EDTA as reducing agent,the plate-like Ag nanostructures were successfully prepared through a SDS-assisted seed-growth process.TEM and UV-vis spectrum analysis indicated the formation of the plate-like Ag nanostructure with thickness less than 20 nm.The formation process of Ag nanoplate was recorded detailed by using Uv-visible spectra.In addition,the effect of reaction temperature,the amount of Ag seed and reducing agents had also be studied.The resultes indicated the peak position and number in UV-visible spectra had obvious change as the temperture increased from 60 ℃ to 80 ℃,and there are no obvious effect as the temperture increased from 80 ℃ to 100 ℃.At the same time,the amount of Ag seed could effect not only size of Ag particles,but also the formation rate.