The as-prepared nanoparticles were dispersed in a solution containing DMF and 2-propanol with the volume ratio of 1:1 before UV-Vis. spectral study with regard to the peak position and band width.

• 将合成的包覆纳米颗粒，分散在体积比为1：1的二甲基甲酰胺和异丙醇的混合液中，研究了紫外-可见光波长范围内的吸收峰位置和峰宽的变化情况。