標題: Colorimetric detection of Fe3+ ions using pyrophosphate functionalized gold nanoparticles
作者: Wu, Shu-Pao
Chen, Yi-Pu
Sung, Yi-Ming
應用化學系
Department of Applied Chemistry
公開日期: 1-Jan-2011
摘要: A sensitive, selective colorimetric Fe3+ detection method has been developed by using pyrophosphate functionalized gold nanoparticles (P2O74--AuNPs). Gold nanoparticles were prepared by reducing HAuCl4 with sodium borohydride, in the presence of Na4P2O7. IR spectra suggested that pyrophosphates were capped on the surface of the gold nanoparticles. Aggregation of P2O74--AuNPs was induced immediately in the presence of Fe3+ ions, yielding a color change from pink to violet. This Fe3+-induced aggregation of P2O74--AuNPs was monitored using first the naked eye and then UV-vis spectroscopy with a detection limit of 5.6 mu M. The P2O74--AuNPs bound by Fe3+ showed excellent selectivity compared to other metal ions (Ca2+, Cd2+, Co2+, Fe2+, Hg2+, K+, Mg2+, Mn2+, Na+, Ni2+, Pb2+, and Zn2+). The best detection of Fe3+ was achieved in a pH range from 3 to 9. In addition, the P2O74--AuNPs were also used to detect Fe3+ in lake water samples, with low interference.
URI: http://dx.doi.org/10.1039/c1an15028f
http://hdl.handle.net/11536/150277
ISSN: 0003-2654
DOI: 10.1039/c1an15028f
期刊: ANALYST
Volume: 136
起始頁: 1887
結束頁: 1891
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