Smart gold nanosensor for easy sensing of lead and copper ions in solution and using paper strips

A smart gold nanosensor, Au-TA-DNS is designed that can rapidly detect very low concentrations of Pb super(2+) and Cu super(2+) ions. The nanosensor develops a visible blue colour in solution and on paper strips, because of the formation of nanoparticle aggregates upon binding with metal ions. Due t...

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Bibliographic Details
Published in:RSC advances 2015-08, Vol.5 (84), p.69024-69031
Main Authors: Nath, Peuli, Arun, Ravi Kumar, Chanda, Nripen
Format: Article
Language:English
Subjects:
Binding
Copper
Detection
Fluorescence
Gold
Nanostructure
Strip
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Summary:A smart gold nanosensor, Au-TA-DNS is designed that can rapidly detect very low concentrations of Pb super(2+) and Cu super(2+) ions. The nanosensor develops a visible blue colour in solution and on paper strips, because of the formation of nanoparticle aggregates upon binding with metal ions. Due to the presence of dansyl fluorophore, Au-TA-DNS also exhibits significant fluorescence quenching following Pb super(2+) and Cu super(2+) binding in aqueous medium, which is proportional to the concentration of ions. Both colorimetric and fluorometric analyses are very much selective for lead and copper ions with a detection limit of less than or equal to 10.0 ppb. The paper based sensing method has the advantage of cost-effectiveness and would be useful for wide range of field-test applications such as water quality monitoring process.
ISSN:2046-2069
2046-2069
DOI:10.1039/c5ra14886c