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Colorimetric detection of Fe3+ ions using pyrophosphate functionalized gold nanoparticles

机译：用焦磷酸盐官能化的金纳米粒子比色检测Fe3 +离子

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摘要

A sensitive, selective colorimetric Fe3+ detection method has been developed by using pyrophosphatenfunctionalized gold nanoparticles (P2O7n4u0001–AuNPs). Gold nanoparticles were prepared by reducingnHAuCl4 with sodium borohydride, in the presence of Na4P2O7. IR spectra suggested thatnpyrophosphates were capped on the surface of the gold nanoparticles. Aggregation of P2O7n4u0001–AuNPsnwas induced immediately in the presence of Fe3+ ions, yielding a color change from pink to violet. ThisnFe3+-induced aggregation of P2O7n4u0001–AuNPs was monitored using first the naked eye and then UV-visnspectroscopy with a detection limit of 5.6 mM. The P2O7n4u0001–AuNPs bound by Fe3+ showed excellentnselectivity compared to other metal ions (Ca2+, Cd2+, Co2+, Fe2+, Hg2+, K+, Mg2+, Mn2+, Na+, Ni2+, Pb2+,nand Zn2+). The best detection of Fe3+ was achieved in a pH range from 3 to 9. In addition, the P2O7n4u0001–nAuNPs were also used to detect Fe3+ in lake water samples, with low interference.
机译：通过使用焦磷酸盐功能化的金纳米粒子（P2O7n4u0001–AuNPs），开发了一种灵敏的，选择性比色法检测Fe3 +的方法。在Na4P2O7存在下，通过用硼氢化钠还原nHAuCl4制备金纳米颗粒。红外光谱表明正焦磷酸盐被覆盖在金纳米颗粒的表面上。在Fe3 +离子的存在下，立即引起P2O7n4u0001–AuNPsn的聚集，颜色从粉红色变为紫色。首先用肉眼，然后用紫外可见光谱法监测此Fe3 +诱导的P2O7n4u0001–AuNPs的聚集，检测限为5.6 mM。与其他金属离子（Ca2 +，Cd2 +，Co2 +，Fe2 +，Hg2 +，K +，Mg2 +，Mn2 +，Na +，Ni2 +，Pb2 +，n和Zn2 +）相比，被Fe3 +结合的P2O7n4u0001–AuNPs具有极好的选择性。在3至9的pH范围内，Fe3 +的检测效果最佳。此外，P2O7n4u0001–nAuNPs还用于检测湖水样品中的Fe3 +，且干扰低。

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  • 来源
    《The Analyst》 |2011年第9期|p.1887-1891|共5页
  • 作者

    Shu-Pao Wu Yi-Pu Chen and Yi-Ming Sung;

  • 作者单位

    Department of Applied Chemistry, National Chiao Tung University,Hsinchu, Taiwan, Republic of China. E-mail: spwu@mail.nctu.edu.tw,Fax: +886-3-5723764, Tel: +886-3-5712121-ext 56506† Electronic supplementary information (ESI) available: IR spectrum ofP2O74u0001–AuNPs, the calibration curve of P2O74u0001–AuNPs in water, thecalibration curve for the detection of Fe3+ by P2O74u0001–AuNPs in water.See DOI: 10.1039/c1an15028f,;

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