染料包覆纳米银粒子复合膜的吸收红移

采用Sol Gel法制备出染料包覆纳米银粒子的复合膜 ,用电镜 (TEM )测量了该复合膜中纳米银粒子的尺寸大小及形态 ,实验测出了复合膜的吸收光谱 .结果发现 ,与纯染料溶液相比 ,在用荧光素钠 (FS)包覆纳米银粒子的复合膜中 ,FS分子吸收峰红移约 1 0nm ;而在用罗丹明 6G(Rh6G)包覆纳米银粒子的复合膜中 ,Rh6G分子吸收峰红移较小 .从理论上对这种结果给予分析和解释

Optical absorption Red-shift of silver nanoparticles composite films for coating dye molecules onto Ag particles surface

Silver nanoparticles coated by dye molecules FS or Rh6G is doped in gelatin matrix, respectively. And the composite films are prepared by the means of Sol Gel technique. The size of silver nanoparticles coated by dye molecules is measured by TEM, and then the absorption spectra of the composite films is measured. It is discovered that the amount of absorption peak Red shift of FS coated onto silver nanoparticles surface is about 10nm compared with FS solution, and the amount of absorption peak Red shift of Rh6G coated onto silver nanoparticles surface is little. This result is analyzed with local field and surface adsorbed state theory.