Authors: Ying Wu Xun Feng Shenghai Zhou Hongyan Shi Hongmin Wu Shujie Zhao Wenbo Song
Publish Date: 2013/08/04
Volume: 180, Issue: 13-14, Pages: 1325-1332
Abstract
We report on a sensor for epinephrine EP that is based on an ITO electrode modified with multiwalled carbon nanotubes precoated with a polymerized ionic liquid PILMWNTs A chitosan film was then electrodeposited on the ITO electrode in the presence of EP the template and the PILMWNTs This film acts as an excellent recognition matrix due to its excellent filmforming ability and the many functional groups that favor hydrogen bond formation with the target EP The PILMWNTs in turn can improve the sensing performance due to their good electrical conductivity high dispersity and large surface area The imprinted films were characterized by scanning electron microscopy Xray diffraction Fourier transform IR spectroscopy and thermogravimetric analysis The electrochemistry of the imprinted electrode was investigated by cyclic voltammetry electrochemical impedance spectroscopy differential pulse voltammetry and chronoamperometry The response to EP is linear in the 02 μM to 067 mM concentration range and the detection limit is as low as 60 nM at an S/N of 3 The electrode is reusable and offers good reproducibility and stabilityAn epinephrine imprinted electrode was facile achieved by electrodepositing chitosan on ITO surface in the presence of epinephrine and polymerized ionic liquidfunctionalized carbon nanotubes followed by removal of the epinephrine template molecule Specific recognition of EP molecule and its determination were realized at this imprinted sensor
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