Fabrication and Characterization of a Novel Azobenzene SAM-LB Composite Film

Abstract

Abstract: Anovel azobenzene SAM-LBcomposite film was fabricated by depositing LangmuirBlodgett monolayer of 4-octyl-4' - (3-carboxy-trimethylene-oxy)-azobenzene (ABD) onto the cysteamine self-assembled monolayer(AET SAM) modified gold substrate.The film stability was greatly improved and the molecular aggregation was effectively prevented by the strong ionic bonding character on the SAM-LBinterface, which was evidenced by both contact-angle titration, RA-FTIRand AFM.The reversible tran/cis isomerization and the clear-cut electrochemical response of cis-azobenzene were observed in the presence of highly organized molecular assemblies.This enable us to carry out a kinetic study of the cis-azobenzene in highly organized monolayers, by which a "more" reversible and unique pHdependent electron-transfer kinetic behavior of azobenzene was shown within the novel SAM-LBcomposite films.

Key words: Self-assembled monolayers, LB film, Azobenzene, trans/cis-Isomerization, Electrochemical kinetics

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ZHAO Chun-Xia, YU Hua-Zhong, WANG Yong-Qiang, CAI Sheng-Min, LIU Zhong-Fan . Fabrication and Characterization of a Novel Azobenzene SAM-LB Composite Film[J]. Chem. J. Chinese Universities, 1997, 18(2): 300.

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Fabrication and Characterization of a Novel Azobenzene SAM-LB Composite Film

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