Issue 7, 2013
From the journal:

Analytical Methods

Dopamine dithiocarbamate functionalized silver nanoparticles as colorimetric sensors for the detection of cobalt ion†

Vaibhavkumar N. Mehta,a   Anil Kumar Mungarab  and  Suresh Kumar Kailasa*a  

* Corresponding authors

a Applied Chemistry Department, S. V. National Institute of Technology, Surat-395 007, India
E-mail: sureshkumarchem@gmail.com
Fax: +91-261-2227334
Tel: +91-261-2201730

b Department of Nanomaterial Chemistry, Dongguk University, Gyeongju 780-714, South Korea

Abstract

A colorimetric assay has been developed for facile, rapid and sensitive detection of Co2+ using dopamine dithiocarbamate functionalized silver nanoparticles (DDTC-Ag NPs) as a colorimetric sensor based on unique surface plasmon resonance properties. The presence of Co2+ induces the aggregation of Ag NPs through coordinate covalent bonds between the catechol groups of DDTC on the surface of Ag NPs and cobalt ions, resulting in a color change from bright yellow to reddish. These color changes are measured by UV-vis spectrophotometry, and can be directly read out with the naked eye. For the detection, UV-visible absorption spectra were measured by the absorbance ratio A570nm/A390nm. Under the optimum conditions, the analytical response was linear over the range from 1.0 mM to 15 mM (R2 = 0.993) with a detection limit of 14 μM. The proposed DDTC-Ag NPs-based colorimetric method is simple and sensitive for the detection of cobalt ions and allows for the monitoring of cobalt ions directly with naked eye.

Graphical abstract: Dopamine dithiocarbamate functionalized silver nanoparticles as colorimetric sensors for the detection of cobalt ion

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Article information

DOI
https://doi.org/10.1039/C3AY26150F
Article type
Paper
Submitted
06 Oct 2012
Accepted
26 Jan 2013
First published
29 Jan 2013

Anal. Methods, 2013,5, 1818-1822

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Dopamine dithiocarbamate functionalized silver nanoparticles as colorimetric sensors for the detection of cobalt ion

V. N. Mehta, A. K. Mungara and S. K. Kailasa, Anal. Methods, 2013, 5, 1818 DOI: 10.1039/C3AY26150F

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