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    Monolayers, Langmuir-Blodgett films of carbon nanotubes-cytochrome c conjugates and electrochemistry

    Year: 2006

    Journal: Colloids and Surfaces A: Physicochem. Eng. Aspects 284-285 (2006) 485-489, 20111221

    Authors: Ai-Rong Liu , Dong-Jin Qian , Tatsuki Wakayama , Chikashi Nakamura, Jun Miyake

    Organizations: a Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China b Research Institute of Cell Engineering, AIST, Amagazaki 661-0974, Hyogo, Japan

    Monolayers of carbon nanotubes (CNTs)-cytochrome c (Cyt c) conjugates have been stabilized at the air-water interface. Both single-walled (SWCNTs) and multi-walled CNTs (MWCNTs) were used to prepare the conjugate monolayers. Surface pressure-area isotherms showed an enlargement for the Cyt c occupied area when CNTs-Cyt c conjugates were spread on the subphase surfaces. Area-time isotherms indicated that the MWCNTs-Cyt c monolayer was more stable than the pure Cyt c and SWCNTs-Cyt c monolayers. With the use of Langmuir-Blodgett (LB) method, (CNTs-)Cyt c monolayers were transferred on to electrode surfaces. Electrochemical measurements for the (CNTs-)Cyt c LB film-modified electrodes showed well reversible redox waves of Cyt c. Compared to that of the pure Cyt c LB film, the redox current intensity was increased for the CNTs-Cyt c conjugate LB film modified electrodes. The results suggest that CNTs can not only support the formation of ultrathin Cyt c LB films, but also enhance the electron transfer between electrode and proteins.