Highly stable and redox active nano copper species stabilized functionalized-multiwalled carbon nanotube/chitosan modified electrode for efficient hydrogen peroxide detection
[Display omitted] ► Very stable and highly redox active copper–CNT–chitosan modified electrode was prepared. ► The electrode showed selective electrocatalytic sensing of H 2O 2 in a physiological pH. ► H 2O 2 containing milk samples were tested. A highly redox active and stable nano copper species i...
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Published in | Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 395; pp. 207 - 216 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
05.02.2012
|
Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
► Very stable and highly redox active copper–CNT–chitosan modified electrode was prepared. ► The electrode showed selective electrocatalytic sensing of H
2O
2 in a physiological pH. ► H
2O
2 containing milk samples were tested.
A highly redox active and stable nano copper species immobilized functionalized-multiwalled carbon nanotube (f-MWCNT)
+
chitosan (CHIT) film coated glassy carbon electrode (Cu@f-MWCNT
+
CHIT/GCE) was fabricated using a new preparation procedure, different from the conventional Cu
2+
+
MWCNT
+
CHIT bulk electro-codeposition coupled glassy carbon surface activation method, for selective and sensitive amperometric estimation of H
2O
2 at −100
mV vs Ag/AgCl in physiological solution. Several copper modified film electrodes with nano copper species immobilized into films made of single component or different combinations of CNT and CHIT (i.e., Cu@f-MWCNT
+
CHIT/GCE, Cu@SWCNT
+
CHIT/GCE, Cu@f-MWCNT/GCE, Cu@MWCNT/GCE, Cu@CHIT/GCE and Cu/GCE) were characterized by cyclic voltammetry in a blank pH 7 phosphate buffer solution (PBS), and only the Cu@f-MWCNT
+
CHIT/GCE showed well-defined redox peak with an half-wave potential (
E
1/2) of −85
mV vs Ag/AgCl for the matrix immobilized Cu
2+/Cu
+ redox species with very good film stability and pronounced leaching resistance to copper. Transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray analysis, X-ray photoelectron spectroscopy were used to give a complete characterization of the Cu@f-MWCNT
+
CHIT/GCE. Effect of potential scan rate and pH on the redox response of the Cu@f-MWCNT
+
CHIT/GCE was studied to probe the mechanism of Cu
2+/Cu
+ electron transfer process. The Cu@f-MWCNT
+
CHIT/GC electrode showed effective electrocatalytic reduction of H
2O
2 in pH 7 PBS. Amperometric
i–
t method of H
2O
2 detection yielded a calibration plot linear up to 125
μM with a current sensitivity of 0.463
A
M
−1
cm
−2. The newly developed Cu@f-MWCNT
+
CHIT/GC electrode displayed remarkable tolerance to co-existing interferents, such as cysteine, ascorbic acid, uric acid and nitrite at the H
2O
2 detection potential in pH 7 PBS. The ability of the sensor electrode for routine analyses was demonstrated by the detection of H
2O
2 present in simulated milk samples with appreciable recovery values. |
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Bibliography: | http://dx.doi.org/10.1016/j.colsurfa.2011.12.032 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0927-7757 1873-4359 |
DOI: | 10.1016/j.colsurfa.2011.12.032 |