基于手性金纳米粒子圆二色光谱法识别与检测银离子

Recognition and Detection of Silver Ion by Circular Dichroism Spectrum Based on Chiral Gold Nanoparticles

采用液相制备方法获得具有光学活性的手性金纳米粒子,通过吸收光谱和圆二色光谱及高分辨透射电镜对手性金纳米粒子进行表征.利用圆二色光谱法建立手性金纳米粒子对Ag^+选择性识别方法,结果表明手性金纳米粒子对Ag^+响应时间仅需12min,手性金纳米粒子能够从13种常见金属离子中选择性识别Ag^+,并对多种常见金属离子具有较好的抗干扰能力,检测灵敏度高并且具有良好的重现性.所建立标准曲线线性范围为0.2~30μmol/L,线性相关系数R^2=0.995(n=15),Ag+的检测限为0.2μmol/L;为环境水样中Ag^+的识别和检测提供了一种简单、精确、快速、环境友好的新方法.

In this work,chiral gold particles with optical activity can be obtained by a facile liquid phase method.The textural proper-ties of the as-prepared samples were characterized by high resolution transmission electron microscopy,circular dichroism spectrum and absorption spectrum.The results show that the average particle size for the production is 3.6 nm and silver ion can be selectively recognized from 1 3 kinds of metal ions in 1 2 min with universal recurrence.We also established the standard curve for detecting silver ion.This study demonstrates that the linear range for this curve is 0.2-30μmol/L,the linearly dependent coefficient is 0.995（n=15）,which supplies a simple new environmentally friendly method for quickly detecting and recognizing silver ion in environmental water samples with high precision.