Browsing by Author "Lee, I-Lin"

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Colorimetric detection of Al3+ ions using triazole-ether functionalized gold nanoparticles
(2013-12-15)
Chen, Yu-Ching
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Lee, I-Lin
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Sung, Yi-Ming
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Wu, Shu-Pao
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應用化學系
A sensitive, selective colorimetric Al3+ detection method has been developed by using triazole-ether functionalized gold nanoparticles (TTP-AuNPs). Gold nanoparticles were prepared by reducing HAuCl4 with sodium borohydride in the presence of 5-(1,2-dithiolan-3-yl)-N-(prop-2-yn-1-yl)pentanamide (TP). The azide part of 2-[2-(2-azidoethoxy)ethoxy]ethanol and the acetylene part of TP were combined to form a triazole structure through a click reaction. Aggregation of TTP-AuNPs was induced immediately in the presence of Al3+ ions, yielding a color change from red to blue. This Al3+-induced aggregation of TTP-AuNPs was monitored first with the naked eye and then UV-vis spectroscopy with a detection limit of 18.0 nM. The TTP-AuNPs showed excellent selectivity for Al3+, compared to other metal ions (Ag+, Ca2+, Cd2+, Co2+, Cu2+, Cr3+, Fe2+, Fe3+, Hg2+, Mg2+, Mn2+, Ni2+, Pb2+, and Zn2+). In addition, TTP-AuNPs were used to detect Al3+ in sea water samples, with low interference. (C) 2013 Elsevier B.V. All rights reserved.
Colorimetric sensing of iodide based on triazole-acetamide functionalized gold nanoparticles
(2014-04-01)
Lee, I-Lin
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Sung, Yi-Ming
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Wu, Chien-Hou
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Wu, Shu-Pao
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應用化學系
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.
Triazole functionalized gold nanoparticles for colorimetric Cr+ sensing
(2013-11-01)
Chen, Yu-Ching
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Lee, I-Lin
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Sung, Yi-Ming
;
Wu, Shu-Pao
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應用化學系
Triazole functionalized gold nanoparticles (NTP@AuNPs) were synthesized through a click reaction and have been developed for sensitive and selective colorimetric Cr3+ detection. Gold nanoparticles were prepared by reducing HAuCl4 with sodium citrate and then using 4-(prop-2-ynyloxy)pyridine (PP) as the capping agent. The acetylene part of PP and the azide part of 1-(azidomethyl)-4-nitrobenzene were combined to form a triazole structure through a click reaction. Aggregation of NTP@AuNPs was induced immediately in the presence of Cr3+ ions, yielding a color change from red to purple. This Cr3+-induced aggregation of NTP@AuNPs was first monitored using the naked eye and then UV-vis spectroscopy with a detection limit of 1.4 mu M. In addition, NTP@AuNPs were also used to detect Cr3+ in lake water samples, with low interference. (C) 2013 Elsevier B.V. All rights reserved.
Triazole-acetate functionalized gold nanoparticles for colorimetric Pb(II) sensing
(2014)
Lee, I-Lin
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Sung, Yi-Ming
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Wu, Shu-Pao
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應用化學系
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Department of Applied Chemistry
New triazole-acetate functionalized gold nanoparticles (TTA-AuNPs) for sensitive and selective colorimetric detection of Pb2+ were developed. Aggregation of TTA-AuNPs was induced immediately in the presence of Pb2+, yielding a color change from wine-red to purple. This Pb2+-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 Pb2+ compared to other metal ions through the interaction between the carboxyl group and triazole structure of TTA and Pb2+. The best detection of Pb2+ was achieved in a pH range from 5 to 10. Furthermore, TTA-AuNPs were applied to detect Pb2+ in lake water with low interference.