Amperometric Sensor Used for Determination of Thiocyanate with a Silver Nanoparticles Modified Electrode

A novel electrode modified with silver nanoparticles was fabricated. It is found that the reducibility of silver nanoparticles is higher than for bulk silver by comparing a silver nanoparticles modified electrode with a silver micro-disk electrode. When SCN- was added, a new oxidation peak occurred...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2004-10, Vol.4 (9), p.147-155
Main Authors: Wang, Guang-Feng, Li, Mao-Guo, Gao, Ying-Chun, Fang, Bin
Format: Article
Language:English
Subjects:
Electrodes
Electrons
Investigations
modified electrode
Nanoparticles
Oxidation
Reagents
Sensors
Silver
Silver nanoparticles
thiocyanate determination
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Summary:A novel electrode modified with silver nanoparticles was fabricated. It is found that the reducibility of silver nanoparticles is higher than for bulk silver by comparing a silver nanoparticles modified electrode with a silver micro-disk electrode. When SCN- was added, a new oxidation peak occurred and the anodic peak current of silver nanoparticles decreased. The new anodic peak current is proportional to the thiocyanate concentration in the range of 5.0×10-7~4.0×10-4 mol/L in pH 6.0 NaH2PO4-Na2HPO4 buffer solutions (PBS). The detection limit (S/N=3) is 4×10-8 mol/L. This method has been applied to the determination of saliva (smoker and non-smoker).
ISSN:1424-8220
1424-8220
DOI:10.3390/s40900147