Catalytic oxidation of thiols at preheated glassy carbon electrode modified with abrasive immobilization of multiwall carbon nanotubes: applications to amperometric detection of thiocytosine, -cysteine and glutathione

Talanta ◽  
2005 ◽  
Vol 66 (4) ◽  
pp. 967-975 ◽  
Author(s):  
A SALIMI ◽  
R HALLAJ
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Oxidation ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Multiwall Carbon Nanotubes ◽  
Amperometric Detection ◽  
Carbon Electrode ◽  
Multiwall Carbon

scholarly journals Amperometric determination of sulfide ion by glassy carbon electrode modified with multiwall carbon nanotubes and copper (II) phenanthroline complex

2014 ◽  
Vol 12 (10) ◽  
pp. 1091-1099 ◽  
Author(s):  
Mojtaba Shamsipur ◽  
Mahmoud Roushani ◽  
Seied Pourmortazavi ◽  
Nahid Shahabadi
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Multiwall Carbon Nanotubes ◽  
Carbon Electrode ◽  
Amperometric Determination ◽  
Sulfide Ion ◽  
Multiwall Carbon

AbstractElectrocatalytic oxidation of sulfide ion on a glassy carbon electrode (GCE) modified with multiwall carbon nanotubes (MWCNTs) and a copper (II) complex was investigated. The Cu(II) complex was used due to the reversibility of the Cu(II)/Cu(III) redox couple. The MWCNTs are evaluated as a transducer, stabilizer and immobilization matrix for the construction of amperometric sensor based on Cu(II) complex adsorbed on MWCNTs immobilized on the surface of GCE. The modified GCE was applied to the selective amperometric detection of sulfide at a potential of 0.47 V (vs. Ag/AgCl) at pH 8.0. The calibration graph was linear in the concentration range of 5 µM–400 µM; while the limit of detection was 1.2 µM, the sensitivity was 34 nA µM−1. The interference effects of SO3 2−, SO4 2−, S2O3 2−, S4O6 2−, Cysteine, and Cystein were negligible at the concentration ratios more than 40 times. The modified electrode is more stable with time and more easily restorable than unmodified electrode surface. Also, modified electrode permits detection of sulfide ion by its oxidation at lower anodic potentials.

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