Title: Triazole functionalized gold nanoparticles for colorimetric Cr+ sensing
Authors: Chen, Yu-Ching
Lee, I-Lin
Sung, Yi-Ming
Wu, Shu-Pao
Department of Applied Chemistry
Keywords: Colorimetric sensor;Cr3+;Gold nanoparticles;Triazole
Issue Date: 1-Nov-2013
Abstract: 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.
URI: http://dx.doi.org/10.1016/j.snb.2013.06.088
ISSN: 0925-4005
DOI: 10.1016/j.snb.2013.06.088
Volume: 188
Begin Page: 354
End Page: 359
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