Abstract
Abstract With the Langmuir-Blodgett (LB) technique, a monolayer of soybean phospholipid molecules was transffered to highly oriented pyrolytic graphite (HOPG). Scanning tunneling microscopy (STM) was employed to probe the surfaces of the monolayer LB film in nanometer scale at specific sites. The top views of the monolayer of soybean phospholipid on HOPG given by STM show that the film is incomplete with defects and pinholes. STM images of the soybean phospholipid LB film with regular rows and individual lipid molecules on HOPG were obtained. Different phases of molecules of the monolayer could be discerned. Experimental results indicate that the surface features of the substrate strongly modulate the phase of deposited molecules and the integrity of the LB films and the films on a flat area are mobile and easy to be brushed away during scanning due to the weak binding of the lipid molecules to the substrate and tip-film interaction.
Published Version
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