Issue 8, 2015

Multiwalled carbon nanotube@reduced graphene oxide nanoribbon heterostructure: synthesis, intrinsic peroxidase-like catalytic activity, and its application in colorimetric biosensing

Abstract

In this study, multiwalled carbon nanotube@reduced graphene oxide nanoribbon (MWCNT@rGONR) core–shell heterostructures have been synthesized by the facile unzipping of MWCNTs and subsequent chemical reduction with hydrazine. MWCNTs with diameter <10 nm were selected as the starting material to maintain narrow ribbons <30 nm wide with a few-layer structure. The most important discovery is that the resulting MWCNT@rGONR heterostructures possess intrinsic peroxidase-like activity, 15.9 times higher than that of MWCNTs and 8.4 times higher than that of their unreduced form. The nature of the peroxidase-like activity of the MWCNT@rGONR heterostructures can be attributed to the acceleration of their electron-transfer process and the consequent facilitation of ˙OH radical generation. Kinetic analysis demonstrates that the catalytic behavior is in accordance with typical Michaelis–Menten kinetics and the obtained kinetic parameters indicate that the MWCNT@rGONR heterostructures display a higher affinity for both H2O2 and 3,3,5,5-tetramethylbenzidine than that of horseradish peroxidase. On this basis, we have employed the MWCNT@rGONR heterostructures as novel biosensing platforms to develop a simple, sensitive, and selective colorimetric biosensor for free cholesterol determination. This work will facilitate the formation of MWCNT@rGONR heterostructures with narrow ribbons and the utilization of their intrinsic peroxidase-like activity in biotechnology and medical diagnostics.

Graphical abstract: Multiwalled carbon nanotube@reduced graphene oxide nanoribbon heterostructure: synthesis, intrinsic peroxidase-like catalytic activity, and its application in colorimetric biosensing

Supplementary files

Article information

Article type
Paper
Submitted
15 10 2014
Accepted
06 1 2015
First published
07 1 2015

J. Mater. Chem. B, 2015,3, 1624-1632

Multiwalled carbon nanotube@reduced graphene oxide nanoribbon heterostructure: synthesis, intrinsic peroxidase-like catalytic activity, and its application in colorimetric biosensing

J. Qian, X. Yang, Z. Yang, G. Zhu, H. Mao and K. Wang, J. Mater. Chem. B, 2015, 3, 1624 DOI: 10.1039/C4TB01702A

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