Eco-friendly synthesis of egg-white capped silver nanoparticles for rapid, selective, and sensitive detection of Hg(II)
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Research Letter
Eco-friendly synthesis of egg-white capped silver nanoparticles for rapid, selective, and sensitive detection of Hg(II) Antonio Tirado-Guizar and Geonel Rodriguez-Gattorno, Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mérida, Yucatán 97310, México Francisco Paraguay-Delgado, Departamento de Física de Materiales, Centro de Investigación en Materiales Avanzados S.C., Av. Miguel de Cervantes 120, Complejo Industrial Chihuahua, CP 31109 Chihuahua, Chih., México Gerko Oskam, Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mérida, Yucatán 97310, México Georgina E. Pina-Luis, Centro de Graduados e Investigación en Química, Instituto Tecnológico de Tijuana, A.P. 1166, Tijuana 22500, BC, México Address all correspondence to Antonio Tirado-Guizar at [email protected] (Received 5 June 2017; accepted 15 August 2017)
Abstract The synthesis of egg-white (EW) capped silver nanoparticles (NPs) was carried-out in a one-step reaction using crude EWs, which is a reagent that can be easily found. These NPs were applied for the colorimetric detection of Hg2+ ions in solution. The results showed a blue shift of the surface plasmon absorption due to the decrease in Ag NP size upon incorporating Hg through the formation of an Ag–Hg amalgam shell. The probe was used for the selective determination of Hg2+ ions in tap water with excellent selectivity and sensitivity with a detection limit of about 300 nM.
Introduction Colorimetric methods based in noble metal nanoparticles (NPs) have become of great interest in recent times mainly due to their molar absorptivity in the visible region (108–1010/M/cm) often several orders of magnitude higher than most organic dyes.[1,2] Despite this great advantage, the NPs have low selectivity toward the analytes, then they must be functionalized conveniently. In particular, functionalized gold and silver NPs (AuNPs and AgNPs) have been reported as selective and sensitive sensors for different analytes. AuNPs, for example, have been functionalized with different ligands including biologic materials (DNA[3]) and simple molecules (Tween-20[4] and mercapto-organic acids[5]). AUNPs have shown excellent results as sensors, but they have important drawbacks as such the high cost of the precursor [HAuCl4 (chloroauric acid)], ligands used (oligonucleotide probes/fluorescent dyes, etc.) and long detection times. The use of functionalized AgNPs as sensor has been preferred over AuNPs, since the synthesis of the former are less expensive and the AgNPs have higher molar absorptivity as compared with AuNPs of same size.[6] The use of highly biocompatible ligands in the Ag NP synthesis has been an important research subject. Some reports describe methods using natural extracts of fruits[7] and leafs.[8] Nevertheless, some of these materials are often only found locally, which makes it difficult to apply. Heavy metals ions such as
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