银纳米粒子的绿色合成及其对荧光素室温磷光的增强效应

以β-环糊精(β-CD)作为稳定剂, 葡萄糖为还原剂, 银氨溶液为前驱体, 实现了绿色化学方法合成银纳米粒子. 利用紫外-可见分光光度法(UV-Vis)、高分辨透射电镜(HRTEM)、红外光谱法(FTIR)对产物进行了表征. 将银纳米粒子引入滤纸表面增强室温磷光(RTP)的研究, 发现银纳米粒子对醋酸铅诱导荧光素(FL)所得的RTP具有明显的增强效应, 并且随着银纳米粒子加入量的增加具有先增强后猝灭的趋势. 对β-CD与银纳米粒子的相互作用机理及银纳米粒子对FL RTP增强效应的作用机理进行了初步讨论.

Synthesis of Ag Nanoparticles via Green Chemistry Method and Their Enhancing Effects on Room Temperature Phosphorescence of Fluorescein

Silver nanoparticles were synthesized via a “green chemistry method”, in which Ag(NH3)2]+ was reduced by β-D-glucose in the presence of β-cyclodextrin(β-CD), and characterized by UV-Vis, HRTEM and FTIR. Enhanced room temperature phosphorescence(RTP) signal of fluorescein on the filter paper surface in the presence of silver nanoparticle was firstly observed. Furthermore, with the increment of Ag nanoparticles’ concentration, the RTP intensity of fluorescein was increased at first, and then decreased when the molar ratio of fluorescein to Ag nanoparticles reached 1∶2. The mechanism of the interaction between Ag nanoparticles and β-CD was proposed, and the enhancing effects of Ag nanoparticles on room temperature phosphorescence of fluorescein were discussed.