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Helical Carbon Nanotubes: Intrinsic Peroxidase Catalytic Activity and Its Application for Biocatalysis and Biosensing
Author(s) -
Cui Rongjing,
Han Zhida,
Zhu JunJie
Publication year - 2011
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.201100478
Subject(s) - amperometry , carbon nanotube , catalysis , nanomaterial based catalyst , biocatalysis , chemistry , electron transfer , materials science , biosensor , nanotechnology , high resolution transmission electron microscopy , chemical engineering , electrochemistry , transmission electron microscopy , organic chemistry , electrode , reaction mechanism , engineering
A combined hydrothermal/hydrogen reduction method has been developed for the mass production of helical carbon nanotubes (HCNTs) by the pyrolysis of acetylene at 475 °C in the presence of Fe 3 O 4 nanoparticles. The synthesized HCNTs have been characterized by high‐resolution transmission electron microscopy, scanning electron microscopy, X‐ray diffraction analysis, vibrating sample magnetometry, and contact‐angle measurements. The as‐prepared helical‐structured carbon nanotubes have a large specific surface area and high peroxidase‐like activity. Catalysis was found to follow Michaelis–Menten kinetics and the HCNTs showed strong affinity for both H 2 O 2 and 3,3′,5,5′,‐tetramethylbenzidine (TMB). Based on the high activity, the HCNTs were firstly used to develop a biocatalyst and amperometric sensor. At pH 7.0, the constructed amperometric sensor showed a linear range for the detection of H 2 O 2 from 0.5 to 115 μ M with a correlation coefficient of 0.999 without the need for an electron‐transfer mediator. Because of their low cost and high stability, these novel metallic HCNTs represent a promising candidate as mimetic enzymes and may find a wide range of new applications, such as in biocatalysis, immunoassay, and environmental monitoring.