A sensitive amperometric hydrogen peroxide sensor based on thionin/EDTA/carbon nanotubes—chitosan composite film modified electrode

2010 ◽  
Vol 171 (1-2) ◽  
pp. 139-144 ◽  
Author(s):  
Keying Zhang ◽  
Li Zhang ◽  
Jigui Xu ◽  
Cong Wang ◽  
Tao Geng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Peroxide ◽  
Composite Film ◽  
Modified Electrode ◽  
Hydrogen Peroxide Sensor ◽  
Chitosan Composite

Hydrogen Peroxide Sensor Based on Carbon Nanotubes - Poly(celestine blue) Nanohybrid Modified Electrode

2014 ◽  
Vol 938 ◽  
pp. 263-268 ◽  
Author(s):  
N.S. Sangeetha ◽  
S. Sriman Narayanan
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Peroxide ◽  
Modified Electrode ◽  
Surface Coverage ◽  
Graphite Electrode ◽  
Electrochemical Characteristics ◽  
Multiwalled Carbon ◽  
Celestine Blue ◽  
Hydrogen Peroxide Sensor ◽  
Conductive Film

A hydrogen peroxide sensor was developed by constructing a conductive film of poly (celestine blue) (PCB) on multiwalled carbon nanotubes (MWCNTs) modified graphite electrode by electropolymerization. The presence of MWCNTs increased the surface coverage concentration of PCB and the rate of electron transfer. Scanning electron microscopy (SEM) was used to characterize the surface morphology of the modified electrode. The electrochemical characteristics of PCB/MWCNTs modified electrode was evaluated by cyclic voltammetry and chronoamperometry. The results revealed that the modified electrode exhibits higher electrocatalytic activity towards the reduction of hydrogen peroxide (H2O2) in 0.1M of NH4NO3 (pH 7) at a reduced overpotential with increased peak currents. The modified electrode showed a wide concentration range from 6.66×10-6 M to 1.34×10-3M with a detection limit of 2.22×10-6 M (S/N = 3) and with a sensitivity of 12.592 μA/μM.

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