Colorimetric detection of Al3+ ions using triazole-ether functionalized gold nanoparticles

Yu Ching Chen, I. Lin Lee, Yi Ming Sung, Shu-Pao Wu*

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Scopus citations


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 Al 3+-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+, Hg 2+, Mg2+, Mn2+, Ni2+, Pb 2+, and Zn2+). In addition, TTP-AuNPs were used to detect Al3+ in sea water samples, with low interference.

Original languageEnglish
Pages (from-to)70-74
Number of pages5
StatePublished - 30 Sep 2013


  • Al
  • Colorimetric sensor
  • Gold nanoparticles
  • Triazole

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