基于原位形成的核/壳Au@Ag纳米粒子比色法测定银离子  

Colorimetric Determination of Silver Ions(I)Based on In-situ Formation of Core/Shell Au@Ag Nanoparticles

作　　者：肖传豪 周博然 陈郑博 XIAO Chuan-hao;ZHOU Bo-ran;CHEN Zheng-bo(Puyang Vocation and Technical College,Puyang Institute of Technology,Henan University,Puyang 457000,China;Department of Chemistry,Capital Normal University,Beijing 100048,China)

机构地区：[1]濮阳职业技术学院,河南大学濮阳工学院,河南濮阳457000 [2]首都师范大学化学系,北京100048

出　　处：《分析测试学报》2025年第3期534-539,共6页Journal of Instrumental Analysis

基　　金：河南省科技攻关项目(232102230084);濮阳职业技术学院创新人才项目(2024PZYKY03)。

摘　　要：该文开发了一种基于金纳米粒子(AuNPs)的无标记比色传感器,用于简单、灵敏和选择性地测定银离子(Ag^(+)),其传感机制归因于AuNPs周围的抗坏血酸(AA)。在pH 6.2的条件下,AA和Ag^(+)之间发生强烈的相互作用并产生核壳型Au@AgNPs,导致518 nm处AuNPs的表面等离子体共振峰强增加和蓝移,在386 nm附近出现新的吸收峰,并伴随着溶液红色到黄色的颜色变化。该比色传感器在386 nm波长处的吸光度变化值与Ag^(+)浓度在0.4~1.4μmol/L范围内呈现良好的线性关系,检出限低至0.115μmol/L。此外,在存在其他干扰金属离子的情况下,该比色传感器对Ag+具有良好的选择性,并可成功应用于废水中Ag+的测定。Due to the serious threat of heavy metal ions to human health,there is an urgent need for rapid and sensitive detection of heavy metal ions in the global natural water environment.This article develops a gold nanoparticle(AuNPs)-based label-free colorimetric sensor for simple,sensitive,and selective determination of silver ions(Ag^(+)).The sensing mechanism is attributed to ascorbic acid(AA)around AuNPs,which can produce strong interactions between AA and Ag+and generate Au@AgNPs at pH 6.2,resulting in simultaneous increasement and blue shift of the surface plasmon resonance(SPR)band of AuNPs at 518 nm,while new peaks appear near 386 nm,accompanied by red-to-yellow color change.On this basis,the colorimetric sensor showed a good linear relationship between the absorbance change at 386 nm wavelength and the Ag+concentration in the range of 0.4-1.4μmol/L,with a detection limit as low as 0.115μmol/L.In addition,the colorimetric sensor has good selectivity for Ag+in presence of other interfering metal ions and can be successfully applied to the determination of Ag^(+)in wastewater.

关 键 词：抗坏血酸 金纳米粒子 比色 下水道水 银离子 

分 类 号：O657.71[理学—分析化学]