title: Colorimetric detection of Al3+ ions using triazole-ether functionalized gold nanoparticles.
abstract: A sensitive, selective colorimetric Al(3+) 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 Al(3+) 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 Al(3+), compared to other metal ions (Ag(+), Ca(2+), Cd(2+), Co(2+), Cu(2+), Cr(3+), Fe(2+), Fe(3+), Hg(2+), Mg(2+), Mn(2+), Ni(2+), Pb(2+), and Zn(2+)). In addition, TTP-AuNPs were used to detect Al(3+) in sea water samples, with low interference.
authors.affiliation: Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 300, ROC.
authors.forename: Yu-Ching
authors.initials: YC
authors.lastname: Chen
authors.forename: I-Lin
authors.initials: IL
authors.lastname: Lee
authors.forename: Yi-Ming
authors.initials: YM
authors.lastname: Sung
authors.forename: Shu-Pao
authors.initials: SP
authors.lastname: Wu
mesh_terms: D000535:Aluminum / Q000032:analysis*; D057930:Click Chemistry; D003124:Colorimetry / Q000379:methods; D004987:Ethers; D006046:Gold / Q000737:chemistry*; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D012623:Seawater / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004987:Ethers; D014230:Triazoles; D014874:Water Pollutants, Chemical; D006046:Gold; D000535:Aluminum
keywords: Al(3+); Colorimetric sensor; Gold nanoparticles; Triazole