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 अक्तूबर 2014
Accepted
06 जनवरी 2015
First published
07 जनवरी 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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