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Title: Application of multi-walled carbon nanotubes functionalized with hemin for oxygen detection in neutral solution
Authors: Ye, J.-S. 
Wen, Y.
Zhang, W.D.
Cui, H.-F. 
Gan, L.M.
Xu, G.Q. 
Sheu, F.-S. 
Keywords: Carbon nanotubes
Electrocatalytic reduction
Issue Date: 1-Feb-2004
Citation: Ye, J.-S., Wen, Y., Zhang, W.D., Cui, H.-F., Gan, L.M., Xu, G.Q., Sheu, F.-S. (2004-02-01). Application of multi-walled carbon nanotubes functionalized with hemin for oxygen detection in neutral solution. Journal of Electroanalytical Chemistry 562 (2) : 241-246. ScholarBank@NUS Repository.
Abstract: Functionalization of multi-walled carbon nanotubes (MWNTs) is of paramount importance for developing new sensors. In this study, a hemin-modified MWNT electrode was successfully constructed. Upon saturation, the amount of adsorbed hemin is estimated as 2.7×10-9 mol cm-2, which is 39 times larger than the value of the hemin monolayer. The electrochemical behavior of the hemin-modified MWNT electrode has been characterized by cyclic voltammetry (CV). The electron-transfer coefficient (α) is found to be 0.38 with a heterogeneous electron transfer rate (k) of 2.9 s-1 for the adsorbed hemin. Both MWNT and hemin-modified MWNT electrodes show ideal reversibility in 5 mM K3[Fe(CN)6] in the range of 0.02-1.00 V s-1, indicating fast electron-transfer kinetics. CV of the hemin-modified MWNT electrode in pH 7.4 phosphate buffer solution (PBS) clearly shows the dioxygen reduction peaks close to 0 V (vs. Ag|AgCl). These results are useful in the development of a novel oxygen sensor for working at a relatively low potential. © 2003 Elsevier B.V. All rights reserved.
Source Title: Journal of Electroanalytical Chemistry
ISSN: 00220728
DOI: 10.1016/j.jelechem.2003.09.007
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