Detection of Cobalt Ion Based on Surface Plasmon Resonance of L-Cysteine Functionalized Silver Nanotriangles

A facile and sensitive spectroscopic detection method for the detection of cobalt ion was introduced by the use of the surface plasmon resonance of silver nanotriangles (AgTrngs). After successful capping and functionalizing of AgTrngs, with an average edge length of ~ 54 nm, by trisodium citrate (T...

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Bibliographic Details
Published in:Plasmonics (Norwell, Mass.) Mass.), 2021-04, Vol.16 (2), p.315-322
Main Authors: Namazi Koochak, Niloofar, Rahbarimehr, Erfan, Amirjani, Amirmostafa, Fatmehsari Haghshenas, Davoud
Format: Article
Language:English
Subjects:
Biochemistry
Biological and Medical Physics
Biophysics
Biotechnology
Body fluids
Chemistry
Chemistry and Materials Science
Cobalt
Cysteine
Dipoles
Nanotechnology
Oxidation
Response time
Sodium citrate
Surface plasmon resonance
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Summary:A facile and sensitive spectroscopic detection method for the detection of cobalt ion was introduced by the use of the surface plasmon resonance of silver nanotriangles (AgTrngs). After successful capping and functionalizing of AgTrngs, with an average edge length of ~ 54 nm, by trisodium citrate (TSC) and L-Cysteine, they were employed for the detection of cobalt ion based on the change in their in-plane dipole resonance. According to the obtained results, the developed sensor showed a response time as short as 10 s with a detection limit of 3.5 nM in the concentration range of 10–100 nM; in addition, this sensor needs a small volume of samples for cobalt ion determination that makes it ideal for the analysis of the body fluids as well as other aqueous effluents. Finally, based on the transmission electron microscopy, the oxidation of AgTrngs by cobalt ion was proposed as the detection mechanisms that result in the decrease in the in-plane dipole plasmon resonance of AgTrngs.
ISSN:1557-1955
1557-1963
DOI:10.1007/s11468-020-01289-2