Premium
Electrochemistry of Hemin Self‐Assembled from Aqueous Hexadecyltrimethylammonium Bromide (CTAB) Solution on Single‐Wall‐Carbon‐Nanotube‐Modified Glassy Carbon Electrodes
Author(s) -
Liu Jiwei,
Qiu Jingxia,
Sun Kai,
Chen Jin,
Miao Yuqing
Publication year - 2009
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200800301
Subject(s) - chemistry , hemin , carbon nanotube , electrochemistry , aqueous solution , bromide , glassy carbon , electrode , inorganic chemistry , redox , horizontal scan rate , cationic polymerization , pulmonary surfactant , nanotube , chemically modified electrode , chemical engineering , working electrode , organic chemistry , cyclic voltammetry , heme , biochemistry , engineering , enzyme
Hemin could be dissolved directly in H 2 O solution in the presence of the cationic surfactant hexadecyltrimethylammonium bromide (CTAB). The hemin is adsorbed on the surface of single‐wall‐carbon‐nanotube‐modified glassy carbon (GC) electrodes by self‐assembly. The modified electrodes exhibit a well‐defined, reversible redox peak with the reduction potential at −0.30 V and a potential separation of 61 mV at pH 7.0. The peak current is found to increase linearly with the scan rate in the range 25–200 mV, and the peak potential is pH‐dependent. The modified electrodes exhibit obvious signal enhancement for the electrochemical reduction of O 2 and H 2 O 2 , and oxidation of L ‐cysteine, which is useful to develop their application in electroanalysis and biosensors.