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Significantly Accelerated Direct Electron‐Transfer Kinetics of Hemoglobin in a C 60 ‐MWCNT Nanocomposite Film
Author(s) -
Zhang Hua,
Fan Louzhen,
Yang Shihe
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600055
Subject(s) - nanocomposite , kinetics , carbon nanotube , electron transfer , materials science , electrochemistry , chemical engineering , reaction rate constant , hemoglobin , nanotechnology , electron , electrode , chemistry , photochemistry , organic chemistry , physics , quantum mechanics , engineering
The direct electrochemistry of hemoglobin (Hb) was studied in a novel all‐carbon nanocomposite film of C 60 ‐MWCNT (MWCNT=multiple‐walled carbon nanotube) and compared with that in bare MWCNT film. The heterogeneous electron‐transfer rate constant k s of Hb/C 60 ‐MWCNT was determined to be 0.39 s −1 , which is more than one order of magnitude greater than that of Hb/MWCNT (0.03 s −1 ). The significantly accelerated electron‐transfer kinetics are attributed to the mediator role played by C 60 , which is finely dispersed on the MWCNT surfaces. The excellent stability of Hb/C 60 ‐MWCNT was established and its potential application towards the electrocatalytic reduction of O 2 was demonstrated.