Abstract: The electron structures of MB molecule and MB adsorbed on the mica surface were measured by XPS to determine how the chemical environment is changed when MB was adsorbed on the mica surface. We concluded that the nitrogen atom of the dimethylamino- is the adsorption site for the MB molecule. From AFM image of MB adsorbed on the mica surface, its corresponding height averages to 0.820 nm. This agrees well with the model proposed by Hähner, that the MB molecules are tilted with their largest face inclined at 65～70° with respect to the surface of mica.

Key words: Methylene blue, Muscovite, XPS, AFM, Adsorption