One-Step Electrochemical Deposition of Prussian Blue-Multiwalled Carbon Nanotube Nanocomposite Thin-film

Dan Du; Minghui Wang

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One-Step Electrochemical Deposition of Prussian Blue-Multiwalled Carbon Nanotube Nanocomposite Thin-film

Dan Du * #,Minghui Wang

Central China Normal University，Key Laboratory of Pesticide and Chemical Biology of Ministry of Education

*Correspondence author

#Submitted by

Subject:

Funding: 教育部博士点基金（No.20070511015）

Opened online:11 August 2009

Accepted by: none

Citation: Dan Du,Minghui Wang.One-Step Electrochemical Deposition of Prussian Blue-Multiwalled Carbon Nanotube Nanocomposite Thin-film [OL]. [11 August 2009] http://en.paper.edu.cn/en_releasepaper/content/34410

Prussian blue-multiwalled carbon nanotube-modified gold (PB-MWCNT/Au) electrodes were successfully fabricated using the electrochemical co-deposition method in which the MWCNTs not only act as a carrier of PB, but also as a modifier for a catalytic function. Fourier transform infrared proved that PB assembled on the surface of MWCNTs through electrochemical co-deposition. Scanning electron microscopy images showed that a relatively porous PB-MWCNT film was formed. Cyclic voltammetry and electrochemical impedance spectroscopy revealed that a PB-coated MWCNTs composite film improved electron and ion transfer relative to pure PB films and also exhibited larger electrode-specific capacitance than PB alone. Compared with PB film, the PB-MWCNT composite film showed a larger response current to the reduction of H2O2 because of the synergistic effects between the MWCNTs and PB particles. This fast, sensitive, and efficient sensor for H2O2 was observed with a detection sensitivity of 856 μA mM-1 cm-2, and the linear range spanned the concentration of H2O2 from 1 μM to 5 mM. The detection limit was 23 nM at a signal-to-noise ratio of 3. The method presented here demonstrated the great potential for CNTs and other inorganic or metal nanoparticles for constructing bioelectronic devices and biosensors.

Keywords:Prussian blue;multiwalled carbon nanotubes;electrochemical co-deposition;synergistic effect

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