FABRICATION AND CHARACTERIZATION OF A NOV EL AZOBENZENE SAM-LB COMPOSITE FILM

A novel azobenzene SAM-LB composite film was fabricated by depositing Langmuir-Blodgett monolayer of yl-4'-(3-carboxy-trimethylene-oxy)-azob enzene(ABD) onto the cysteamine sell-assembled monolayer(AET SAM) modi fied gold substrate, The film stability was greatly improved and the m olecular aggregation was effectively prevented by the strong ionic bon ding character on the SAM-LB interface, which was evidenced by both co ntact-angle titration, RA-FTIR and AFM. The reversible tran/cis isomer ization and the clear-cut electrochemical response of cis-azobenzene w ere 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 pH dependent electron-transfer kinetic behavior of azobenzene was sho wn within the novel SAR(I-LB composite films.