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Title: Self-assembly of bilayer lipid membrane at multiwalled carbon nanotubes towards the development of photo-switched functional device
Authors: Ye, J.-S. 
Cui, H.-F. 
Wen, Y.
Zhang, W.D.
Ottova, A.
Tien, H.T.
Xu, G.Q. 
Sheu, F.-S. 
Keywords: Bilayer lipid membrane
C 60
Carbon nanotubes
Electron mediator
Issue Date: Jan-2005
Source: Ye, J.-S., Cui, H.-F., Wen, Y., Zhang, W.D., Ottova, A., Tien, H.T., Xu, G.Q., Sheu, F.-S. (2005-01). Self-assembly of bilayer lipid membrane at multiwalled carbon nanotubes towards the development of photo-switched functional device. Electrochemistry Communications 7 (1) : 81-86. ScholarBank@NUS Repository.
Abstract: Bilayer lipid membrane (BLM) was self-assembled on a uniquely fabricated hydrophilic surface, containing N atoms from the carbon source of ethylene amine, of the multi-walled carbon nanotubes (MWNTs) to form the BLM/MWNTs nanocomposites. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and photoelectric experiments were taken to study the properties of the BLM/MWNTs nanocomposites. The thickness of the BLM, which was calculated from the CV data obtained at BLM/MWNTs electrode, turned out to be 4.38 nm, suggesting that the lipid self-assembled at the nanotubes surface was consistent with a bilayer structure. C 60-incorporated BLM could also be self-assembled at the nanotubes surface (C 60-BLM/MWNTs). The formation of BLM on the MWNTs surface blocked the diffusion of [Fe(CN) 6] 3/4- redox ions across BLM to the MWNTs electrode as no redox current was observed by CV measurement, whereas the incorporation of the electron mediator, C 60, resumed a pair of redox peaks at C 60-BLMs/MWNTs electrode. Moreover, the incorporation of C 60 led to a four order of magnitude reduction of the resistance of C 60-BLM/MWNTs (369.3 Ω) than that of BLM/MWNTs (3.238 × 10 6 Ω). MWNTs electrode exhibited an intrinsic cathodic photocurrent (166 μA cm -2) while BLM/MWNTs electrode blocked photocurrent response of the MWNTs. Interestingly, C 60-BLM/MWNTs electrode resumed partial photoelectric properties (photo current: 65 μA cm -2) due to the electron mediation effect of C 60 incorporated into the lipid membrane. As a result, the novel self-assembled BLM/MWNTs nanocomposites provided a simple yet useful model to study the C 60-mediated photoelectric properties of the BLM/MWNTs which may be applicable to develop new biosensors and molecular devices. © 2004 Published by Elsevier B.V.
Source Title: Electrochemistry Communications
ISSN: 13882481
DOI: 10.1016/j.elecom.2004.11.013
Appears in Collections:Staff Publications

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