Journal
TALANTA
Volume 80, Issue 5, Pages 1719-1724Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2009.10.012
Keywords
Polymerized ionic liquid; Carbon nanotubes; Glucose oxidase; Direct electrochemistry; Biosensing
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Funding
- NSFC [20675027, 20975033]
- Program for Fu-Rong Scholar in Hunan Province, China
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Polymerized ionic liquid-wrapped carbon nanotubes (PIL-CNTs) were firstly designed for direct electrochemistry and biosensing of redox proteins. The CNTs were coated successfully with polymerized ionic liquid (PIL) layer, as verified by transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FT-IR) spectroscopy. The PIL-CNTs were dispersed better in water and showed superior electrocatalysis toward O-2 and H2O2 comparing to pristine CNTs and the mixture of IL monomer and CNTs. With glucose oxidase (GOD) as a protein model, the direct electrochemistry of the redox protein was investigated on the PIL-CNTs modified glassy carbon (GC) electrode and excellent direct electrochemical performance of GOD molecules was observed. The proposed biosensor (GOD/PIL-CNTs/GC electrode) displayed good analytical performance for glucose with linear response up to 6 mM, response sensitivity of 0.853 mu A mM(-1), good stability and selectivity. (C) 2009 Elsevier B.V. All rights reserved.
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