基于焦磷酸根功能化金纳米粒子的 Fe3+ 离子比色检测

Colorimetric detection of Fe3+ ions using pyrophosphate functionalized gold nanoparticles.

机构信息

Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan, Republic of China.

出版信息

Analyst. 2011 May 7;136(9):1887-91. doi: 10.1039/c1an15028f. Epub 2011 Mar 4.

Abstract

A sensitive, selective colorimetric Fe(3+) detection method has been developed by using pyrophosphate functionalized gold nanoparticles (P(2)O(7)(4-)-AuNPs). Gold nanoparticles were prepared by reducing HAuCl(4) with sodium borohydride, in the presence of Na(4)P(2)O(7). IR spectra suggested that pyrophosphates were capped on the surface of the gold nanoparticles. Aggregation of P(2)O(7)(4-)-AuNPs was induced immediately in the presence of Fe(3+) ions, yielding a color change from pink to violet. This Fe(3+)-induced aggregation of P(2)O(7)(4-)-AuNPs was monitored using first the naked eye and then UV-vis spectroscopy with a detection limit of 5.6 μM. The P(2)O(7)(4-)-AuNPs bound by Fe(3+) showed excellent selectivity compared to other metal ions (Ca(2+), Cd(2+), Co(2+), Fe(2+), Hg(2+), K(+), Mg(2+), Mn(2+), Na(+), Ni(2+), Pb(2+), and Zn(2+)). The best detection of Fe(3+) was achieved in a pH range from 3 to 9. In addition, the P(2)O(7)(4-)-AuNPs were also used to detect Fe(3+) in lake water samples, with low interference.

摘要

一种灵敏、选择性的比色 Fe(3+)检测方法已经通过焦磷酸盐功能化的金纳米粒子（P(2)O(7)(4-)-AuNPs）得以开发。金纳米粒子是通过硼氢化钠还原 HAuCl(4)，同时存在 Na(4)P(2)O(7)制备的。IR 光谱表明焦磷酸盐被覆盖在金纳米粒子的表面。在 Fe(3+)离子的存在下，P(2)O(7)(4-)-AuNPs 立即发生聚集，导致颜色从粉红色变为紫色。这种 Fe(3+)诱导的 P(2)O(7)(4-)-AuNPs 聚集可以通过肉眼观察，也可以通过紫外-可见光谱进行监测，检测限为 5.6 μM。与其他金属离子（Ca(2+)、Cd(2+)、Co(2+)、Fe(2+)、Hg(2+)、K(+)、Mg(2+)、Mn(2+)、Na(+)、Ni(2+)、Pb(2+)和 Zn(2+)）相比，与 Fe(3+)结合的 P(2)O(7)(4-)-AuNPs 表现出优异的选择性。Fe(3+)的最佳检测是在 pH 值为 3 到 9 的范围内实现的。此外，P(2)O(7)(4-)-AuNPs 也被用于检测湖水样品中的 Fe(3+)，干扰较小。