Journal
MICROCHIMICA ACTA
Volume 181, Issue 5-6, Pages 573-579Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-013-1150-0
Keywords
Colorimetric sensor; Iodide; Gold nanoparticles; Triazole
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Funding
- National Science Council (ROC)
- National Chiao Tung University
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We have modified gold nanoparticles (AuNPs) with triazole acetamide to obtain a material for the sensitive and selective colorimetric determination of iodide. The functionalized AuNPs were prepared by a reductive single chemical step using a Cu(I)-catalyzed click reaction. The presence of iodide ions induces the aggregation of these AuNPs and results in a color change from wine-red to purple. The iodide-induced aggregation can be detected visually with bare eyes, but also by photometry. The detection limit is as low as 15 nM. The method displays excellent selectivity for iodide over other anions due to the selective interaction with the amido groups of the triazole. The method was applied to the determination of iodide in spiked lake waters.
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