Bifunctionalization of silver nanoparticles with 6-mercaptonicotinic acid and melamine for simultaneous colorimetric sensing of Cr³⁺ and Ba²⁺ ions

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• 作者：Richita P. ModiAuthor Vitae ; Vaibhavkumar N. MehtaAuthor Vitae ; Suresh Kumar Kailasa ; ^{skk@ashd.svnit.ac.in" class="auth_mail}Author Vitae
• 关键词：Bifunctionalized Ag NPs ; Cr3+ ; Ba2+ ; UV&ndash ; visible spectrometry ; DLS ; FT-IR and water samples
• 刊名：Sensors and Actuators B: Chemical
• 出版年：May, 2014
• 年：2014
• 卷：195
• 期：Complete
• 页码：562-571
• 全文大小：3077 K

文摘

In this study, silver nanoparticles (Ag NPs) were bifunctionalized with 6-mercaptonicotinic acid (MNA) and melamine (MA) for simple, rapid and simultaneous colorimetric detection of Cr³⁺ and Ba²⁺ ions in water samples. The bifunctionalized Ag NPs were confirmed by UV-visible, FT-IR, dynamic light scattering (DLS), transmission electron microscopy (TEM), and atomic force microscopic (AFM) techniques. The bifunctionalized Ag NPs were induced to aggregate quickly with Cr³⁺ and Ba²⁺ ions through color change from yellow- to reddish brown (Cr³⁺) and -to orange (Ba²⁺), respectively which was readily seen by the naked eye. The recognition mechanism is attributed to the unique structures of MNA and MA on Ag NPs surfaces, which can yield strong interactions (cooperative metal-ligand interaction) between Ag NPs and metal ions (Cr³⁺ and Ba²⁺). It was observed that the addition of metal ions could induce the aggregation of Ag NPs solutions at pH 6.0, yielding changes in color and in UV-visible absorption spectra. Using this system, good liner range was obtained in the range of 10-370 渭M, with limit of detection 64.51 and 80.21 nM for Cr³⁺ and Ba²⁺ ions, respectively. This method was successfully applied to detect metal ions (Cr³⁺ and Ba²⁺) in drinking, tap and river water samples.