Colorimetric Detection of Co2+ Ion Using Silver Nanoparticles with Spherical, Plate, and Rod Shapes

A highly sensitive colorimetric sensing platform for the selective trace analysis for Co2+ ions is reported, based on glutathione (GSH)-modified silver nanoparticles (AgNP). The shape of metallic nanoparticles used in colorimetric detection, using the unique optical properties of plasmonic nanoparti...

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Bibliographic Details
Published in:Langmuir 2013-07, Vol.29 (28), p.8978-8982
Main Authors: Sung, Hwa Kyung, Oh, Seung Yeon, Park, Chulhwan, Kim, Younghun
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:A highly sensitive colorimetric sensing platform for the selective trace analysis for Co2+ ions is reported, based on glutathione (GSH)-modified silver nanoparticles (AgNP). The shape of metallic nanoparticles used in colorimetric detection, using the unique optical properties of plasmonic nanoparticles, is almost spherical. Therefore, in this work we attempted to investigate the selective detection of heavy metal ion (Co2+), with the shape of AgNPs (nanosphere, nanoplate, and nanorod). GSH-AgNP with spherical shape shows a high sensitivity for all of the metal ions (Ni2+, Co2+, Cd2+, Pb2+, and As3+) but poor selective recognition for target metal ions. Whereas, AgNPs solution containing rod-type GSH-AgNP has a special response to Co2+, and its selective detection might be based on the cooperative effect of CTAB and GSH. Therefore, Co2+ ion could be selectively recognized using rod-type GSH-AgNPs.
ISSN:0743-7463
1520-5827
DOI:10.1021/la401408f