Synthesis and Application of Ag Nanoparticles for an Undergraduate Laboratory: Ultrasensitive Method to Detect Copper(II) Ions

Herein, we describe a simple laboratory experiment to address nanomaterial synthesis, plasmon resonance, and its application to detect Cu2+ in ultralow concentrations. The proposed experiment is very visual and appealing for chemistry students, especially the undergraduate-level chemistry major. In...

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Bibliographic Details
Published in:Journal of chemical education 2020-10, Vol.97 (10), p.3771-3777
Main Authors: Farinas, Pedro Sanchez, Doimo, Ana Luiza, da Silva, Marcos A. R, Teixeira, Ivo F
Format: Article
Language:English
Subjects:
Cations
Chemical synthesis
Chemistry
College students
Color
Copper
Copper compounds
Experiments
Instrumentation
Ions
Laboratory Experiments
Majors (Students)
Nanomaterials
Nanoparticles
Noun phrases
Organic Chemistry
Resonance
Science Instruction
Silver
Undergraduate Students
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Summary:Herein, we describe a simple laboratory experiment to address nanomaterial synthesis, plasmon resonance, and its application to detect Cu2+ in ultralow concentrations. The proposed experiment is very visual and appealing for chemistry students, especially the undergraduate-level chemistry major. In this experiment, the aggregation of silver nanoparticles (Ag NPs) promoted by interactions between the NPs and cations in solution induces a color change in the Ag NP suspension. This visual color change can be explained by concepts of plasmon resonance and nanomaterial properties which can be addressed in this laboratory course. The experiment comprises three main parts: (1) synthesis of Ag NPs using a well-established method reported in the literature; (2) functionalization of the Ag NP surface by l-cysteine; and (3) application of the Ag NPs to detect Cu2+ ions in ultralow concentrations. This experiment can be performed with a relatively simple laboratory infrastructure and with instrumentation that is generally widely available.
ISSN:0021-9584
1938-1328
DOI:10.1021/acs.jchemed.0c00310