A simple method for amino-functionalization of carbon nanotubes and electrodeposition to modify neural microelectrodes


A simple method for amino-functionalization of carbon nanotubes 
and electrodeposition to modify neural microelectrodes

Haihan Zhoua, Tanyuan Wanga,b, Yanwen Y. Duan a
a College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
b College of Chemistry and Molecular Engineering, Peking University, Beijing, China

 

Abstract

Aiming to improve the charge transfer ability at the neural electrode interface, a new and simple method
for amino-functionalization of carbon nanotubes (CNTs) has been attempted, and the amino-functionalized
CNTs after quaternization were electrodeposited onto pretreated Pt microelectrodes using an 80 V
cell voltage in anhydrous solvent. The formation of amino-functionalized CNTs and electrodeposition
of the functionalized CNTs were confirmed by Fourier transform infrared (FT-IR) spectroscopy and SEM
images respectively. The deposited electrodes exhibited a reduction by 91% in the electrode impedance
at 1 kHz compared to smooth Pt electrodes. In addition, the CNT deposited electrodes possessed a large
charge storage capacity, and provided an increased safe charge injection (Qinj) limit (1.6–2.0 mC/cm2) that
is ten times higher than that of Pt electrodes. Electrochemical stability is another important characteristic
required by neural electrodes. It was found that the CNT deposited microelectrodes were very stable during
electrical stimulation, which is highly desirable for implantable neural electrodes. In summary, this
study developed an easy and mild coating method for elevating the safe charge injection limit of neural
microelectrodes, which can be applied to neural prostheses such as visual prostheses

Article info

Article history:
Available online 13 September 2012
The paper is for ‘‘Honor CHA & TIAN’’

Keywords:

Carbon nanotubes
Amino-functionalization
Electrodeposition
Neural electrode
Neural electrical stimulation

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