Nam, Yun-Sik Yoon, Su-Jin Noh, Kwon Chul Lee, Yeonhee Lee, Kang-Bong 2024-01-20T00:04:10Z 2024-01-20T00:04:10Z 2021-09-03 2017-11 1533-4880 https://pubs.kist.re.kr/handle/201004/122109 A simple and sensitive colorimetric assay method for the determination of Cu2+ ions in aqueous samples was developed using silver nanoparticles functionalized with 1-(2-mercaptoethyl)-1,3,5-triazinane-2,4,6-trione (MTT-AgNPs). The Cu2+ ion appears to play the role of the metal center of the coordination complex, which can form N-Cu2+-O coordination bonds with the MTT-AgNPs, shorten their interparticle distance, and induce aggregation of the MTT-AgNPs. The binding site and sensing mechanism of Cu2+ to MTT-AgNPs were characterized by XPS and FT-IR spectroscopy. This aggregation results in a dramatic color change from yellow to dark red. Therefore, the concentration of Cu2+ ions in environmental samples can be quantitatively detected by the naked eye or by UV-Vis spectrometry when using the MTT-AgNP sensor. The sensitivity of the detection is significantly improved by modulating the solution to pH 9, leading to a more rapid color change in the optimized AgNP system. The absorption ratios (A(555)/A(395)) of the modified AgNP solution exhibited a linear correlation with the Cu2+ ion concentrations, with a limit of detection of 15.2 nM. This cost-effective detection system allows for the rapid and facile determination of the concentration of Cu2+ ions in aqueous samples. English American Scientific Publishers Highly Selective Colorimetric Assay of Cu2+ Ions by Silver Nanoparticles Conjugated with 1-(2-mercaptoethyl)-1,3,5-Triazinane-2,4,6-Trione Article 10.1166/jnn.2017.15174 1 Journal of Nanoscience and Nanotechnology, v.17, no.11, pp.8485 - 8493 Journal of Nanoscience and Nanotechnology 17 11 8485 8493 N scie scopus 000414491600116 2-s2.0-85027381527 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article MODIFIED GOLD-NANOPARTICLE COPPER IONS DNA SPECTROMETRY WATER ACID Cu2+ Ion Silver Nanoparticles Colorimetric Nanoparticle Sensor Sensitive Selective Assay Method