Triazole-acetate functionalized gold nanoparticles for colorimetric Pb( ii ) sensing

New triazole-acetate functionalized gold nanoparticles (TTA–AuNPs) for sensitive and selective colorimetric detection of Pb 2+ were developed. Aggregation of TTA–AuNPs was induced immediately in the presence of Pb 2+ , yielding a color change from wine-red to purple. This Pb 2+ -induced aggregation...

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Bibliographic Details
Published in:RSC advances 2014-01, Vol.4 (48), p.25251-25256
Main Authors: Lee, I-Lin, Sung, Yi-Ming, Wu, Shu-Pao
Format: Article
Language:English
Subjects:
Agglomeration
Carboxyl group
Color
Colorimetry
Gold
Lakes
Nanoparticles
Triazoles
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Summary:New triazole-acetate functionalized gold nanoparticles (TTA–AuNPs) for sensitive and selective colorimetric detection of Pb 2+ were developed. Aggregation of TTA–AuNPs was induced immediately in the presence of Pb 2+ , yielding a color change from wine-red to purple. This Pb 2+ -induced aggregation of TTA–AuNPs was monitored by the bare eye and UV-vis spectroscopy with a detection limit of 16.7 nM. TTA–AuNPs showed excellent selectivity toward Pb 2+ compared to other metal ions through the interaction between the carboxyl group and triazole structure of TTA and Pb 2+ . The best detection of Pb 2+ was achieved in a pH range from 5 to 10. Furthermore, TTA–AuNPs were applied to detect Pb 2+ in lake water with low interference.
ISSN:2046-2069
2046-2069
DOI:10.1039/C4RA02448F